diff --git a/.idea/jsonSchemas.xml b/.idea/jsonSchemas.xml
index af62da91e2..74188ba28f 100644
--- a/.idea/jsonSchemas.xml
+++ b/.idea/jsonSchemas.xml
@@ -1006,6 +1006,25 @@
             </SchemaInfo>
           </value>
         </entry>
+        <entry key="metadata/app/reactions">
+          <value>
+            <SchemaInfo>
+              <option name="generatedName" value="New Schema" />
+              <option name="name" value="metadata/app/reactions" />
+              <option name="relativePathToSchema" value="schema/metadata/app/reactions.json" />
+              <option name="schemaVersion" value="JSON Schema version 7" />
+              <option name="patterns">
+                <list>
+                  <Item>
+                    <option name="pattern" value="true" />
+                    <option name="path" value="*/Resources/metadata/app/reactions.json" />
+                    <option name="mappingKind" value="Pattern" />
+                  </Item>
+                </list>
+              </option>
+            </SchemaInfo>
+          </value>
+        </entry>
         <entry key="metadata/app/rebuild">
           <value>
             <SchemaInfo>
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 2295b6c3ea..603397e5ac 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -394,6 +394,12 @@
             ],
             "url": "./schema/metadata/app/portalContainerServices.json"
         },
+        {
+            "fileMatch": [
+                "*/Resources/metadata/app/reactions.json"
+            ],
+            "url": "./schema/metadata/app/reactions.json"
+        },
         {
             "fileMatch": [
                 "*/Resources/metadata/app/rebuild.json"
diff --git a/application/Espo/Classes/FieldProcessing/Note/AdditionalFieldsLoader.php b/application/Espo/Classes/FieldProcessing/Note/AdditionalFieldsLoader.php
index 2d8d5f117d..5981ec745a 100644
--- a/application/Espo/Classes/FieldProcessing/Note/AdditionalFieldsLoader.php
+++ b/application/Espo/Classes/FieldProcessing/Note/AdditionalFieldsLoader.php
@@ -33,14 +33,21 @@ use Espo\Core\FieldProcessing\Loader;
 use Espo\Core\FieldProcessing\Loader\Params;
 use Espo\Entities\Note;
 use Espo\ORM\Entity;
+use Espo\Tools\Stream\MassNotePreparator;
 
 /**
  * @implements Loader<Note>
  */
 class AdditionalFieldsLoader implements Loader
 {
+    public function __construct(
+        private MassNotePreparator $massNotePreparator,
+    ) {}
+
     public function process(Entity $entity, Params $params): void
     {
         $entity->loadAdditionalFields();
+
+        $this->massNotePreparator->prepare([$entity]);
     }
 }
diff --git a/application/Espo/Classes/FieldValidators/Settings/AvailableReactions/Valid.php b/application/Espo/Classes/FieldValidators/Settings/AvailableReactions/Valid.php
new file mode 100644
index 0000000000..ebde19a82e
--- /dev/null
+++ b/application/Espo/Classes/FieldValidators/Settings/AvailableReactions/Valid.php
@@ -0,0 +1,66 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Classes\FieldValidators\Settings\AvailableReactions;
+
+use Espo\Core\FieldValidation\Validator;
+use Espo\Core\FieldValidation\Validator\Data;
+use Espo\Core\FieldValidation\Validator\Failure;
+use Espo\Core\Utils\Metadata;
+use Espo\Entities\Settings;
+use Espo\ORM\Entity;
+
+/**
+ * @implements Validator<Settings>
+ */
+class Valid implements Validator
+{
+    public function __construct(private Metadata $metadata)
+    {}
+
+    public function validate(Entity $entity, string $field, Data $data): ?Failure
+    {
+        $value = $entity->get($field);
+
+        if (!is_array($value)) {
+            return null;
+        }
+
+        /** @var string[] $allowedList */
+        $allowedList = array_map(fn ($it) => $it['type'], $this->metadata->get("app.reactions.list", []));
+
+        foreach ($value as $it) {
+            if (!in_array($it, $allowedList)) {
+                return Failure::create();
+            }
+        }
+
+        return null;
+    }
+}
diff --git a/application/Espo/Controllers/Stream.php b/application/Espo/Controllers/Stream.php
index 08d17a3128..7a42eb1d88 100644
--- a/application/Espo/Controllers/Stream.php
+++ b/application/Espo/Controllers/Stream.php
@@ -34,6 +34,7 @@ use Espo\Core\Exceptions\BadRequest;
 use Espo\Core\Api\Request;
 use Espo\Core\Exceptions\Forbidden;
 use Espo\Core\Exceptions\NotFound;
+use Espo\Core\Field\DateTime;
 use Espo\Core\Record\SearchParamsFetcher;
 
 use Espo\Core\Select\SearchParams;
@@ -42,6 +43,7 @@ use Espo\Entities\User as UserEntity;
 use Espo\Tools\Stream\RecordService;
 
 use Espo\Tools\Stream\UserRecordService;
+use Espo\Tools\UserReaction\ReactionStreamService;
 use stdClass;
 
 class Stream
@@ -51,7 +53,8 @@ class Stream
     public function __construct(
         private RecordService $service,
         private UserRecordService $userRecordService,
-        private SearchParamsFetcher $searchParamsFetcher
+        private SearchParamsFetcher $searchParamsFetcher,
+        private ReactionStreamService $reactionStreamService,
     ) {}
 
     /**
@@ -73,9 +76,13 @@ class Stream
         if ($scope === UserEntity::ENTITY_TYPE) {
             $collection = $this->userRecordService->find($id, $searchParams);
 
+            $reactionsCheckDate = DateTime::createNow();
+
             return (object) [
                 'total' => $collection->getTotal(),
                 'list' => $collection->getValueMapList(),
+                'reactionsCheckDate' => $reactionsCheckDate->toString(),
+                'updatedReactions' => $this->getReactionUpdates($request, $id),
             ];
         }
 
@@ -195,4 +202,22 @@ class Stream
 
         return $searchParams;
     }
+
+    /**
+     * @throws BadRequest
+     * @throws Forbidden
+     * @throws NotFound
+     * @return stdClass[]
+     */
+    private function getReactionUpdates(Request $request, ?string $id): array
+    {
+        $reactionsAfter = $request->getQueryParam('reactionsAfter');
+        $noteIds = explode(',', $request->getQueryParam('reactionsCheckNoteIds') ?? '');
+
+        if (!$reactionsAfter || !$noteIds) {
+            return [];
+        }
+
+        return $this->reactionStreamService->getReactionUpdates(DateTime::fromString($reactionsAfter), $noteIds, $id);
+    }
 }
diff --git a/application/Espo/Core/Upgrades/Migrations/V9_0/AfterUpgrade.php b/application/Espo/Core/Upgrades/Migrations/V9_0/AfterUpgrade.php
new file mode 100644
index 0000000000..203938d5b1
--- /dev/null
+++ b/application/Espo/Core/Upgrades/Migrations/V9_0/AfterUpgrade.php
@@ -0,0 +1,69 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Upgrades\Migrations\V9_0;
+
+use Espo\Core\Upgrades\Migration\Script;
+use Espo\Entities\Preferences;
+use Espo\Entities\User;
+use Espo\ORM\EntityManager;
+
+class AfterUpgrade implements Script
+{
+    public function __construct(
+        private EntityManager $entityManager,
+    ) {}
+
+    public function run(): void
+    {
+        $users = $this->entityManager
+            ->getRDBRepositoryByClass(User::class)
+            ->sth()
+            ->where([
+                'isActive' => true,
+                'type' => [
+                    User::TYPE_ADMIN,
+                    User::TYPE_REGULAR,
+                    User::TYPE_PORTAL,
+                ]
+            ])
+            ->find();
+
+        foreach ($users as $user) {
+            $preferences = $this->entityManager->getRepositoryByClass(Preferences::class)->getById($user->getId());
+
+            if (!$preferences) {
+                continue;
+            }
+
+            $preferences->set('reactionNotifications', true);
+            $this->entityManager->saveEntity($preferences);
+        }
+    }
+}
diff --git a/application/Espo/Entities/Note.php b/application/Espo/Entities/Note.php
index 9463cfb512..7323d9b015 100644
--- a/application/Espo/Entities/Note.php
+++ b/application/Espo/Entities/Note.php
@@ -35,6 +35,7 @@ use Espo\Core\ORM\Entity;
 use Espo\Core\Field\DateTime;
 
 use Espo\ORM\Collection;
+use Espo\ORM\Entity as OrmEntity;
 use RuntimeException;
 use stdClass;
 
@@ -360,6 +361,11 @@ class Note extends Entity
         return $this;
     }
 
+    public function getParent(): ?OrmEntity
+    {
+        return $this->relations->getOne('parent');
+    }
+
     /**
      * @return iterable<Attachment>
      */
diff --git a/application/Espo/Entities/Notification.php b/application/Espo/Entities/Notification.php
index e1a42b5e76..3aa9ef41b6 100644
--- a/application/Espo/Entities/Notification.php
+++ b/application/Espo/Entities/Notification.php
@@ -44,6 +44,7 @@ class Notification extends Entity
     public const TYPE_NOTE = 'Note';
     public const TYPE_MENTION_IN_POST = 'MentionInPost';
     public const TYPE_MESSAGE = 'Message';
+    public const TYPE_USER_REACTION = 'UserReaction';
     public const TYPE_SYSTEM = 'System';
 
     public function getType(): ?string
@@ -93,9 +94,28 @@ class Notification extends Entity
         return $this->getValueObject('related');
     }
 
-    public function setRelated(?LinkParent $related): self
+    public function setRelated(LinkParent|Entity|null $related): self
     {
-        $this->setValueObject('related', $related);
+        if ($related instanceof LinkParent) {
+            $this->setValueObject('related', $related);
+
+            return $this;
+        }
+
+        $this->relations->set('related', $related);
+
+        return $this;
+    }
+
+    public function setRelatedParent(LinkParent|Entity|null $relatedParent): self
+    {
+        if ($relatedParent instanceof LinkParent) {
+            $this->setValueObject('relatedParent', $relatedParent);
+
+            return $this;
+        }
+
+        $this->relations->set('relatedParent', $relatedParent);
 
         return $this;
     }
diff --git a/application/Espo/Entities/UserReaction.php b/application/Espo/Entities/UserReaction.php
new file mode 100644
index 0000000000..44a64c8b21
--- /dev/null
+++ b/application/Espo/Entities/UserReaction.php
@@ -0,0 +1,70 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Entities;
+
+use Espo\Core\Field\LinkParent;
+use Espo\Core\ORM\Entity;
+
+class UserReaction extends Entity
+{
+    const ENTITY_TYPE = 'UserReaction';
+
+    public function getType(): string
+    {
+        return $this->get('type');
+    }
+
+    public function getParent(): LinkParent
+    {
+        /** @var LinkParent */
+        return $this->getValueObject('parent');
+    }
+
+    public function setType(string $type): self
+    {
+        $this->set('type', $type);
+
+        return $this;
+    }
+
+    public function setParent(Note $note): self
+    {
+        $this->relations->set('parent', $note);
+
+        return $this;
+    }
+
+    public function setUser(User $user): self
+    {
+        $this->relations->set('user', $user);
+
+        return $this;
+    }
+}
diff --git a/application/Espo/Resources/defaults/config.php b/application/Espo/Resources/defaults/config.php
index 5d1bb31c03..56aadb97a1 100644
--- a/application/Espo/Resources/defaults/config.php
+++ b/application/Espo/Resources/defaults/config.php
@@ -308,5 +308,7 @@ return [
     'authIpAddressWhitelist' => [],
     'authIpAddressCheckExcludedUsersIds' => [],
     'authIpAddressCheckExcludedUsersNames' => (object) [],
+    'availableReactions' => ['Like'],
+    'streamReactionsCheckMaxSize' => 50,
     'isInstalled' => false,
 ];
diff --git a/application/Espo/Resources/i18n/en_US/Global.json b/application/Espo/Resources/i18n/en_US/Global.json
index c666f396e3..9ecd3e2716 100644
--- a/application/Espo/Resources/i18n/en_US/Global.json
+++ b/application/Espo/Resources/i18n/en_US/Global.json
@@ -311,7 +311,10 @@
         "Copy to Clipboard": "Copy to Clipboard",
         "Copied to clipboard": "Copied to clipboard",
         "Audit Log": "Audit Log",
-        "View Audit Log": "View Audit Log"
+        "View Audit Log": "View Audit Log",
+        "Reacted": "Reacted",
+        "Reaction Removed": "Reaction Removed",
+        "Reactions": "Reactions"
     },
     "messages": {
         "pleaseWait": "Please wait...",
@@ -517,7 +520,9 @@
         "assign": "{entityType} {entity} has been assigned to you",
         "emailReceived": "Email received from {from}",
         "entityRemoved": "{user} removed {entityType} {entity}",
-        "emailInbox": "{user} added email {entity} to your inbox"
+        "emailInbox": "{user} added email {entity} to your inbox",
+        "userPostReaction": "{user} reacted to your {post}",
+        "userPostInParentReaction": "{user} reacted to your {post} in {entityType} {entity}"
     },
     "streamMessages": {
         "post": "{user} posted on {entityType} {entity}",
@@ -984,5 +989,15 @@
     },
     "strings": {
         "yesterdayShort": "Yest"
+    },
+    "reactions": {
+        "Smile": "Smile",
+        "Surprise": "Surprise",
+        "Laugh": "Laugh",
+        "Meh": "Meh",
+        "Sad": "Sad",
+        "Love": "Love",
+        "Like": "Like",
+        "Dislike": "Dislike"
     }
 }
diff --git a/application/Espo/Resources/i18n/en_US/Preferences.json b/application/Espo/Resources/i18n/en_US/Preferences.json
index 8b027a4d1e..b972e24bb6 100644
--- a/application/Espo/Resources/i18n/en_US/Preferences.json
+++ b/application/Espo/Resources/i18n/en_US/Preferences.json
@@ -15,6 +15,7 @@
         "receiveStreamEmailNotifications": "Email notifications about posts and status updates",
         "assignmentNotificationsIgnoreEntityTypeList": "In-app assignment notifications",
         "assignmentEmailNotificationsIgnoreEntityTypeList": "Email assignment notifications",
+        "reactionNotifications": "In-app notifications about reactions",
         "autoFollowEntityTypeList": "Global Auto-Follow",
         "signature": "Email Signature",
         "dashboardTabList": "Tab List",
diff --git a/application/Espo/Resources/i18n/en_US/Settings.json b/application/Espo/Resources/i18n/en_US/Settings.json
index 673246d20c..68f4a1f345 100644
--- a/application/Espo/Resources/i18n/en_US/Settings.json
+++ b/application/Espo/Resources/i18n/en_US/Settings.json
@@ -172,7 +172,8 @@
         "quickSearchFullTextAppendWildcard": "Append wildcard in quick search",
         "authIpAddressCheck": "Restrict access by IP address",
         "authIpAddressWhitelist": "IP Address Whitelist",
-        "authIpAddressCheckExcludedUsers": "Users excluded from check"
+        "authIpAddressCheckExcludedUsers": "Users excluded from check",
+        "availableReactions": "Available Reactions"
     },
     "options": {
         "authenticationMethod": {
diff --git a/application/Espo/Resources/layouts/Note/defaultSidePanel.json b/application/Espo/Resources/layouts/Note/defaultSidePanel.json
new file mode 100644
index 0000000000..fe51488c70
--- /dev/null
+++ b/application/Espo/Resources/layouts/Note/defaultSidePanel.json
@@ -0,0 +1 @@
+[]
diff --git a/application/Espo/Resources/layouts/Preferences/detail.json b/application/Espo/Resources/layouts/Preferences/detail.json
index 2274c421bb..de50339571 100644
--- a/application/Espo/Resources/layouts/Preferences/detail.json
+++ b/application/Espo/Resources/layouts/Preferences/detail.json
@@ -139,6 +139,10 @@
             [
                 {"name": "assignmentNotificationsIgnoreEntityTypeList"},
                 {"name": "assignmentEmailNotificationsIgnoreEntityTypeList"}
+            ],
+            [
+                {"name": "reactionNotifications"},
+                false
             ]
         ]
     }
diff --git a/application/Espo/Resources/layouts/Preferences/detailPortal.json b/application/Espo/Resources/layouts/Preferences/detailPortal.json
index 0836aa55d1..0d31f28a1d 100644
--- a/application/Espo/Resources/layouts/Preferences/detailPortal.json
+++ b/application/Espo/Resources/layouts/Preferences/detailPortal.json
@@ -27,7 +27,11 @@
         "label": "Notifications",
         "name": "notifications",
         "rows": [
-            [{"name": "receiveStreamEmailNotifications"}, false]
+            [{"name": "receiveStreamEmailNotifications"}, false],
+            [
+                {"name": "reactionNotifications"},
+                false
+            ]
         ]
     }
 ]
diff --git a/application/Espo/Resources/layouts/Settings/settings.json b/application/Espo/Resources/layouts/Settings/settings.json
index 96daa33f03..0cb008b291 100644
--- a/application/Espo/Resources/layouts/Settings/settings.json
+++ b/application/Espo/Resources/layouts/Settings/settings.json
@@ -46,9 +46,9 @@
         "tabBreak": true,
         "tabLabel": "$label:General",
         "rows": [
-            [{"name": "followCreatedEntities"}, {"name": "emailAddressIsOptedOutByDefault"}],
-            [{"name": "aclAllowDeleteCreated"}, {"name": "cleanupDeletedRecords"}],
-            [{"name": "exportDisabled"}, {"name": "b2cMode"}],
+            [{"name": "cleanupDeletedRecords"}, {"name": "emailAddressIsOptedOutByDefault"}],
+            [{"name": "aclAllowDeleteCreated"}, {"name": "b2cMode"}],
+            [{"name": "exportDisabled"}, false],
             [{"name": "pdfEngine"}, false]
         ]
 
@@ -80,5 +80,11 @@
         "rows": [
             [{"name": "attachmentUploadMaxSize"}, {"name": "attachmentUploadChunkSize"}]
         ]
+    },
+    {
+        "label": "Stream",
+        "rows": [
+            [{"name": "availableReactions"}, {"name": "followCreatedEntities"}]
+        ]
     }
 ]
diff --git a/application/Espo/Resources/metadata/app/config.json b/application/Espo/Resources/metadata/app/config.json
index fcdeaf6c3d..7a636acb99 100644
--- a/application/Espo/Resources/metadata/app/config.json
+++ b/application/Espo/Resources/metadata/app/config.json
@@ -153,6 +153,9 @@
         },
         "authIpAddressCheckExcludedUsers": {
             "level": "superAdmin"
+        },
+        "availableReactions": {
+            "level": "global"
         }
     }
 }
diff --git a/application/Espo/Resources/metadata/app/reactions.json b/application/Espo/Resources/metadata/app/reactions.json
new file mode 100644
index 0000000000..25fe4698a4
--- /dev/null
+++ b/application/Espo/Resources/metadata/app/reactions.json
@@ -0,0 +1,36 @@
+{
+    "list": [
+        {
+            "type": "Smile",
+            "iconClass": "far fa-face-smile"
+        },
+        {
+            "type": "Surprise",
+            "iconClass": "far fa-face-surprise"
+        },
+        {
+            "type": "Laugh",
+            "iconClass": "far fa-face-laugh"
+        },
+        {
+            "type": "Meh",
+            "iconClass": "far fa-face-meh"
+        },
+        {
+            "type": "Sad",
+            "iconClass": "far fa-face-frown"
+        },
+        {
+            "type": "Love",
+            "iconClass": "far fa-heart"
+        },
+        {
+            "type": "Like",
+            "iconClass": "far fa-thumbs-up"
+        },
+        {
+            "type": "Dislike",
+            "iconClass": "far fa-thumbs-down"
+        }
+    ]
+}
diff --git a/application/Espo/Resources/metadata/clientDefs/Note.json b/application/Espo/Resources/metadata/clientDefs/Note.json
index e66d2d047d..d98e3da7bd 100644
--- a/application/Espo/Resources/metadata/clientDefs/Note.json
+++ b/application/Espo/Resources/metadata/clientDefs/Note.json
@@ -11,5 +11,8 @@
     },
     "itemViews": {
         "Post": "views/stream/notes/post"
+    },
+    "viewSetupHandlers": {
+        "record/detail": ["handlers/note/record-detail-setup"]
     }
 }
diff --git a/application/Espo/Resources/metadata/entityDefs/Note.json b/application/Espo/Resources/metadata/entityDefs/Note.json
index 7a979eb032..f71ad88210 100644
--- a/application/Espo/Resources/metadata/entityDefs/Note.json
+++ b/application/Espo/Resources/metadata/entityDefs/Note.json
@@ -128,6 +128,20 @@
             "customizationDisabled": true,
             "readOnly": true
         },
+        "reactionCounts": {
+            "type": "jsonObject",
+            "notStorable": true,
+            "readOnly": true,
+            "customizationDisabled": true,
+            "utility": true
+        },
+        "myReactions": {
+            "type": "jsonArray",
+            "notStorable": true,
+            "readOnly": true,
+            "customizationDisabled": true,
+            "utility": true
+        },
         "createdAt": {
             "type": "datetime",
             "readOnly": true,
diff --git a/application/Espo/Resources/metadata/entityDefs/Notification.json b/application/Espo/Resources/metadata/entityDefs/Notification.json
index 541acb3508..3bc6efb8e2 100644
--- a/application/Espo/Resources/metadata/entityDefs/Notification.json
+++ b/application/Espo/Resources/metadata/entityDefs/Notification.json
@@ -39,9 +39,18 @@
         "relatedParent": {
             "type": "linkParent",
             "readOnly": true
+        },
+        "createdBy": {
+            "type": "link",
+            "readOnly": true,
+            "view": "views/fields/user"
         }
     },
     "links": {
+        "createdBy": {
+            "type": "belongsTo",
+            "entity": "User"
+        },
         "user": {
             "type": "belongsTo",
             "entity": "User"
diff --git a/application/Espo/Resources/metadata/entityDefs/Preferences.json b/application/Espo/Resources/metadata/entityDefs/Preferences.json
index 7d288bf642..9191faf8cf 100644
--- a/application/Espo/Resources/metadata/entityDefs/Preferences.json
+++ b/application/Espo/Resources/metadata/entityDefs/Preferences.json
@@ -107,6 +107,10 @@
             "translation": "Global.scopeNamesPlural",
             "view": "views/preferences/fields/assignment-email-notifications-ignore-entity-type-list"
         },
+        "reactionNotifications": {
+            "type": "bool",
+            "default": true
+        },
         "autoFollowEntityTypeList": {
             "type": "multiEnum",
             "view": "views/preferences/fields/auto-follow-entity-type-list",
diff --git a/application/Espo/Resources/metadata/entityDefs/Settings.json b/application/Espo/Resources/metadata/entityDefs/Settings.json
index fa119c8be9..4b3713f805 100644
--- a/application/Espo/Resources/metadata/entityDefs/Settings.json
+++ b/application/Espo/Resources/metadata/entityDefs/Settings.json
@@ -918,6 +918,14 @@
             "type": "linkMultiple",
             "entity": "User",
             "tooltip": true
+        },
+        "availableReactions": {
+            "type": "array",
+            "maxCount": 9,
+            "view": "views/settings/fields/available-reactions",
+            "validatorClassNameList": [
+                "Espo\\Classes\\FieldValidators\\Settings\\AvailableReactions\\Valid"
+            ]
         }
     }
 }
diff --git a/application/Espo/Resources/metadata/entityDefs/UserReaction.json b/application/Espo/Resources/metadata/entityDefs/UserReaction.json
new file mode 100644
index 0000000000..12c08170e6
--- /dev/null
+++ b/application/Espo/Resources/metadata/entityDefs/UserReaction.json
@@ -0,0 +1,39 @@
+{
+    "fields": {
+        "type": {
+            "type": "varchar",
+            "maxLength": 10
+        },
+        "user": {
+            "type": "link"
+        },
+        "parent": {
+            "type": "linkParent"
+        },
+        "createdAt": {
+            "type": "datetime"
+        }
+    },
+    "links": {
+        "user": {
+            "type": "belongsTo",
+            "entity": "User"
+        },
+        "parent": {
+            "type": "belongsToParent",
+            "entityList": ["Note"]
+        }
+    },
+    "indexes": {
+        "parentUserType": {
+            "unique": true,
+            "columns": [
+                "parentId",
+                "parentType",
+                "userId",
+                "type"
+            ]
+        }
+    },
+    "noDeletedAttribute": true
+}
diff --git a/application/Espo/Resources/metadata/scopes/UserReaction.json b/application/Espo/Resources/metadata/scopes/UserReaction.json
new file mode 100644
index 0000000000..39c96e7ac2
--- /dev/null
+++ b/application/Espo/Resources/metadata/scopes/UserReaction.json
@@ -0,0 +1,3 @@
+{
+    "entity": true
+}
diff --git a/application/Espo/Resources/routes.json b/application/Espo/Resources/routes.json
index 74512f483a..02b8bd525c 100644
--- a/application/Espo/Resources/routes.json
+++ b/application/Espo/Resources/routes.json
@@ -324,6 +324,21 @@
         "method": "post",
         "actionClassName": "Espo\\Tools\\Attachment\\Api\\PostCopy"
     },
+    {
+        "route": "/Note/:id/myReactions/:type",
+        "method": "post",
+        "actionClassName": "Espo\\Tools\\Stream\\Api\\PostMyReactions"
+    },
+    {
+        "route": "/Note/:id/myReactions/:type",
+        "method": "delete",
+        "actionClassName": "Espo\\Tools\\Stream\\Api\\DeleteMyReactions"
+    },
+    {
+        "route": "/Note/:id/reactors/:type",
+        "method": "get",
+        "actionClassName": "Espo\\Tools\\Stream\\Api\\GetNoteReactors"
+    },
     {
         "route": "/EmailTemplate/:id/prepare",
         "method": "post",
diff --git a/application/Espo/Tools/Stream/Api/DeleteMyReactions.php b/application/Espo/Tools/Stream/Api/DeleteMyReactions.php
new file mode 100644
index 0000000000..7d8bc73b3d
--- /dev/null
+++ b/application/Espo/Tools/Stream/Api/DeleteMyReactions.php
@@ -0,0 +1,62 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\Stream\Api;
+
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Record\EntityProvider;
+use Espo\Entities\Note;
+use Espo\Tools\Stream\MyReactionsService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class DeleteMyReactions implements Action
+{
+    public function __construct(
+        private EntityProvider $entityProvider,
+        private MyReactionsService $myReactionsService,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id') ?? throw new BadRequest();
+        $type = $request->getRouteParam('type') ?? throw new BadRequest();
+
+        $note = $this->entityProvider->getByClass(Note::class, $id);
+
+        $this->myReactionsService->unReact($note, $type);
+
+        return ResponseComposer::json(true);
+    }
+}
diff --git a/application/Espo/Tools/Stream/Api/GetNoteReactors.php b/application/Espo/Tools/Stream/Api/GetNoteReactors.php
new file mode 100644
index 0000000000..aced7d436f
--- /dev/null
+++ b/application/Espo/Tools/Stream/Api/GetNoteReactors.php
@@ -0,0 +1,106 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\Stream\Api;
+
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Record\EntityProvider;
+use Espo\Core\Record\SearchParamsFetcher;
+use Espo\Core\Select\SelectBuilderFactory;
+use Espo\Entities\Note;
+use Espo\Entities\User;
+use Espo\Entities\UserReaction;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Query\Part\Condition;
+use Espo\ORM\Query\Part\Expression;
+use Espo\ORM\Query\SelectBuilder;
+
+/**
+ * @noinspection PhpUnused
+ */
+class GetNoteReactors implements Action
+{
+    public function __construct(
+        private EntityProvider $entityProvider,
+        private SearchParamsFetcher $searchParamsFetcher,
+        private SelectBuilderFactory $selectBuilderFactory,
+        private EntityManager $entityManager,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id') ?? throw new BadRequest();
+        $type = $request->getRouteParam('type') ?? throw new BadRequest();
+
+        $note = $this->entityProvider->getByClass(Note::class, $id);
+        $searchParams = $this->searchParamsFetcher->fetch($request);
+
+        $query = $this->selectBuilderFactory
+            ->create()
+            ->from(User::ENTITY_TYPE)
+            ->withSearchParams($searchParams)
+            ->withStrictAccessControl()
+            ->withDefaultOrder()
+            ->buildQueryBuilder()
+            ->select([
+                'id',
+                'name',
+                'userName',
+            ])
+            ->where(
+                Condition::in(
+                    Expression::column('id'),
+                    SelectBuilder::create()
+                        ->from(UserReaction::ENTITY_TYPE)
+                        ->select('userId')
+                        ->where([
+                            'type' => $type,
+                            'parentId' => $note->getId(),
+                            'parentType' => $note->getEntityType(),
+                        ])
+                        ->build()
+                )
+            )
+            ->build();
+
+        $repository = $this->entityManager->getRDBRepositoryByClass(User::class);
+
+        $users = $repository->clone($query)->find();
+        $count = $repository->clone($query)->count();
+
+        return ResponseComposer::json([
+            'list' => $users->getValueMapList(),
+            'total' => $count,
+        ]);
+    }
+}
diff --git a/application/Espo/Tools/Stream/Api/PostMyReactions.php b/application/Espo/Tools/Stream/Api/PostMyReactions.php
new file mode 100644
index 0000000000..c23651c9f0
--- /dev/null
+++ b/application/Espo/Tools/Stream/Api/PostMyReactions.php
@@ -0,0 +1,62 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\Stream\Api;
+
+use Espo\Core\Api\Action;
+use Espo\Core\Api\Request;
+use Espo\Core\Api\Response;
+use Espo\Core\Api\ResponseComposer;
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Record\EntityProvider;
+use Espo\Entities\Note;
+use Espo\Tools\Stream\MyReactionsService;
+
+/**
+ * @noinspection PhpUnused
+ */
+class PostMyReactions implements Action
+{
+    public function __construct(
+        private EntityProvider $entityProvider,
+        private MyReactionsService $myReactionsService,
+    ) {}
+
+    public function process(Request $request): Response
+    {
+        $id = $request->getRouteParam('id') ?? throw new BadRequest();
+        $type = $request->getRouteParam('type') ?? throw new BadRequest();
+
+        $note = $this->entityProvider->getByClass(Note::class, $id);
+
+        $this->myReactionsService->react($note, $type);
+
+        return ResponseComposer::json(true);
+    }
+}
diff --git a/application/Espo/Tools/Stream/GlobalRecordService.php b/application/Espo/Tools/Stream/GlobalRecordService.php
index ef0e0a4fec..18773c9606 100644
--- a/application/Espo/Tools/Stream/GlobalRecordService.php
+++ b/application/Espo/Tools/Stream/GlobalRecordService.php
@@ -58,7 +58,8 @@ class GlobalRecordService
         private EntityManager $entityManager,
         private QueryHelper $queryHelper,
         private NoteAccessControl $noteAccessControl,
-        private NoteHelper $noteHelper
+        private NoteHelper $noteHelper,
+        private MassNotePreparator $massNotePreparator,
     ) {}
 
     /**
@@ -139,6 +140,8 @@ class GlobalRecordService
             $this->noteHelper->prepare($note);
         }
 
+        $this->massNotePreparator->prepare($collection);
+
         return RecordCollection::createNoCount($collection, $maxSize);
     }
 
diff --git a/application/Espo/Tools/Stream/MassNotePreparator.php b/application/Espo/Tools/Stream/MassNotePreparator.php
new file mode 100644
index 0000000000..93f5f0649f
--- /dev/null
+++ b/application/Espo/Tools/Stream/MassNotePreparator.php
@@ -0,0 +1,165 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\Stream;
+
+use Espo\Core\Utils\Config;
+use Espo\Entities\Note;
+use Espo\Entities\User;
+use Espo\Entities\UserReaction;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Query\Part\Expression;
+use Espo\ORM\Query\Part\Selection;
+use Espo\ORM\Query\SelectBuilder;
+
+/**
+ * @internal
+ */
+class MassNotePreparator
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private User $user,
+        private Config $config,
+    ) {}
+
+    /**
+     * @param iterable<Note> $notes
+     */
+    public function prepare(iterable $notes): void
+    {
+        if ($this->noAvailableReactions()) {
+            return;
+        }
+
+        $ids = $this->getPostIds($notes);
+
+        $this->prepareMyReactions($ids, $notes);
+        $this->prepareReactionCounts($ids, $notes);
+    }
+
+    /**
+     * @param iterable<Note> $notes
+     * @return string[]
+     */
+    private function getPostIds(iterable $notes): array
+    {
+        $ids = [];
+
+        foreach ($notes as $note) {
+            if ($note->getType() !== Note::TYPE_POST) {
+                continue;
+            }
+
+            $ids[] = $note->getId();
+        }
+
+        return $ids;
+    }
+
+    /**
+     * @param string[] $ids
+     * @param iterable<Note> $notes
+     */
+    private function prepareMyReactions(array $ids, iterable $notes): void
+    {
+        $myUserReactionCollection = $this->entityManager
+            ->getRDBRepositoryByClass(UserReaction::class)
+            ->where([
+                'userId' => $this->user->getId(),
+                'parentType' => Note::ENTITY_TYPE,
+                'parentId' => $ids,
+            ])
+            ->find();
+
+        /** @var UserReaction[] $myUserReactions */
+        $myUserReactions = iterator_to_array($myUserReactionCollection);
+
+        foreach ($notes as $note) {
+            $noteMyReactions = [];
+
+            foreach ($myUserReactions as $reaction) {
+                if ($reaction->getParent()->getId() !== $note->getId()) {
+                    continue;
+                }
+
+                $noteMyReactions[] = $reaction->getType();
+            }
+
+            $note->set('myReactions', $noteMyReactions);
+        }
+    }
+
+    /**
+     * @param string[] $ids
+     * @param iterable<Note> $notes
+     */
+    private function prepareReactionCounts(array $ids, iterable $notes): void
+    {
+        $query = SelectBuilder::create()
+            ->from(UserReaction::ENTITY_TYPE)
+            ->select([
+                Selection::create(Expression::count(Expression::column('id')), 'count'),
+                'parentId',
+                'type',
+            ])
+            ->where([
+                'parentType' => Note::ENTITY_TYPE,
+                'parentId' => $ids,
+            ])
+            ->group('parentId')
+            ->group('type')
+            ->build();
+
+        /** @var array<int, array{count: int, type: string, parentId: string}> $rows */
+        $rows = $this->entityManager
+            ->getQueryExecutor()
+            ->execute($query)
+            ->fetchAll();
+
+        foreach ($notes as $note) {
+            $counts = [];
+
+            foreach ($rows as $row) {
+                if ($row['parentId'] !== $note->getId()) {
+                    continue;
+                }
+
+                $counts[$row['type']] = $row['count'];
+            }
+
+            $note->set('reactionCounts', $counts);
+        }
+    }
+
+    private function noAvailableReactions(): bool
+    {
+        return $this->config->get('availableReactions', []) === [];
+    }
+}
diff --git a/application/Espo/Tools/Stream/MyReactionsService.php b/application/Espo/Tools/Stream/MyReactionsService.php
new file mode 100644
index 0000000000..d08dfe97ab
--- /dev/null
+++ b/application/Espo/Tools/Stream/MyReactionsService.php
@@ -0,0 +1,155 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\Stream;
+
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Core\Utils\Config;
+use Espo\Core\WebSocket\Submission as WebSocketSubmission;
+use Espo\Entities\Note;
+use Espo\Entities\User;
+use Espo\Entities\UserReaction;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Query\DeleteBuilder;
+use Espo\Tools\UserReaction\NotificationService;
+
+class MyReactionsService
+{
+    public function __construct(
+        private Config $config,
+        private EntityManager $entityManager,
+        private User $user,
+        private WebSocketSubmission $webSocketSubmission,
+        private NotificationService $notificationService,
+    ) {}
+
+    /**
+     * @throws Forbidden
+     */
+    public function react(Note $note, string $type): void
+    {
+        if (!$this->isReactionAllowed($type)) {
+            throw new Forbidden("Not allowed reaction '$type'.");
+        }
+
+        if ($note->getType() !== Note::TYPE_POST) {
+            throw new Forbidden("Cannot react on non-post note.");
+        }
+
+        $this->entityManager->getTransactionManager()->run(function () use ($type, $note) {
+            $repository = $this->entityManager->getRDBRepositoryByClass(UserReaction::class);
+
+            $found = $repository
+                ->forUpdate()
+                ->where([
+                    'userId' => $this->user->getId(),
+                    'parentType' => Note::ENTITY_TYPE,
+                    'parentId' => $note->getId(),
+                    'type' => $type,
+                ])
+                ->findOne();
+
+            if ($found) {
+                return;
+            }
+
+            $this->deleteAll($note);
+            $this->notificationService->removeNoteUnread($note, $this->user);
+
+            $reaction = $repository->getNew();
+
+            $reaction
+                ->setParent($note)
+                ->setUser($this->user)
+                ->setType($type);
+
+            $this->entityManager->saveEntity($reaction);
+        });
+
+        $this->webSocketSubmit($note);
+        $this->notificationService->notifyNote($note, $type);
+    }
+
+    public function unReact(Note $note, string $type): void
+    {
+        $repository = $this->entityManager->getRDBRepositoryByClass(UserReaction::class);
+
+        $reaction = $repository
+            ->where([
+                'userId' => $this->user->getId(),
+                'parentType' => $note->getEntityType(),
+                'parentId' => $note->getId(),
+                'type' => $type,
+            ])
+            ->findOne();
+
+        if (!$reaction) {
+            return;
+        }
+
+        $this->notificationService->removeNoteUnread($note, $this->user, $type);
+
+        $this->entityManager->removeEntity($reaction);
+
+        $this->webSocketSubmit($note);
+    }
+
+    private function isReactionAllowed(string $type): bool
+    {
+        /** @var string[] $allowedReactions */
+        $allowedReactions = $this->config->get('availableReactions') ?? [];
+
+        return in_array($type, $allowedReactions);
+    }
+
+    private function deleteAll(Note $note): void
+    {
+        $deleteQuery = DeleteBuilder::create()
+            ->from(UserReaction::ENTITY_TYPE)
+            ->where([
+                'userId' => $this->user->getId(),
+                'parentType' => Note::ENTITY_TYPE,
+                'parentId' => $note->getId(),
+            ])
+            ->build();
+
+        $this->entityManager->getQueryExecutor()->execute($deleteQuery);
+    }
+
+    private function webSocketSubmit(Note $note): void
+    {
+        if (!$this->config->get('useWebSocket')) {
+            return;
+        }
+
+        $topic = "streamUpdate.{$note->getParentType()}.{$note->getParentId()}";
+
+        $this->webSocketSubmission->submit($topic, null, (object) ['noteId' => $note->getId()]);
+    }
+}
diff --git a/application/Espo/Tools/Stream/RecordService.php b/application/Espo/Tools/Stream/RecordService.php
index a0a96bf51a..dd0ab22b46 100644
--- a/application/Espo/Tools/Stream/RecordService.php
+++ b/application/Espo/Tools/Stream/RecordService.php
@@ -59,7 +59,8 @@ class RecordService
         private Helper $helper,
         private QueryHelper $queryHelper,
         private Metadata $metadata,
-        private NoteHelper $noteHelper
+        private NoteHelper $noteHelper,
+        private MassNotePreparator $massNotePreparator,
     ) {}
 
     /**
@@ -158,6 +159,8 @@ class RecordService
             $this->prepareNote($item, $scope, $id);
         }
 
+        $this->massNotePreparator->prepare($collection);
+
         return $collection;
     }
 
@@ -216,6 +219,8 @@ class RecordService
             $this->prepareNote($e, $scope, $id);
         }
 
+        $this->massNotePreparator->prepare($collection);
+
         $count = $this->entityManager
             ->getRDBRepositoryByClass(Note::class)
             ->clone($countBuilder->build())
diff --git a/application/Espo/Tools/Stream/UserRecordService.php b/application/Espo/Tools/Stream/UserRecordService.php
index 96df085d23..da6e01babd 100644
--- a/application/Espo/Tools/Stream/UserRecordService.php
+++ b/application/Espo/Tools/Stream/UserRecordService.php
@@ -68,7 +68,8 @@ class UserRecordService
         private NoteAccessControl $noteAccessControl,
         private Helper $helper,
         private QueryHelper $queryHelper,
-        private NoteHelper $noteHelper
+        private NoteHelper $noteHelper,
+        private MassNotePreparator $massNotePreparator,
     ) {}
 
     /**
@@ -614,6 +615,8 @@ class UserRecordService
             $this->noteHelper->prepare($e);
         }
 
+        $this->massNotePreparator->prepare($collection);
+
         return RecordCollection::createNoCount($collection, $maxSize);
     }
 }
diff --git a/application/Espo/Tools/UserReaction/NotificationService.php b/application/Espo/Tools/UserReaction/NotificationService.php
new file mode 100644
index 0000000000..8f004044e4
--- /dev/null
+++ b/application/Espo/Tools/UserReaction/NotificationService.php
@@ -0,0 +1,118 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\UserReaction;
+
+use Espo\Core\Field\LinkParent;
+use Espo\Core\ORM\Entity;
+use Espo\Entities\Note;
+use Espo\Entities\Notification;
+use Espo\Entities\Preferences;
+use Espo\Entities\User;
+use Espo\ORM\EntityManager;
+use Espo\Tools\Stream\Service;
+
+class NotificationService
+{
+    public function __construct(
+        private EntityManager $entityManager,
+        private User $user,
+        private Service $streamService,
+    ) {}
+
+    public function notifyNote(Note $note, string $type): void
+    {
+        $recipientId = $note->getCreatedById();
+
+        if (!$recipientId || $recipientId === $this->user->getId()) {
+            return;
+        }
+
+        $parent = $note->getParent();
+
+        if ($parent && !$this->streamService->checkIsFollowed($parent, $note->getCreatedById())) {
+            return;
+        }
+
+        if (!$this->isEnabledForUser($recipientId)) {
+            return;
+        }
+
+        $notification = $this->entityManager->getRDBRepositoryByClass(Notification::class)->getNew();
+
+        $data = [
+            'type' => $type,
+            'userId' => $this->user->getId(),
+        ];
+
+        $notification
+            ->setType(Notification::TYPE_USER_REACTION)
+            ->setUserId($recipientId)
+            ->setRelated(LinkParent::createFromEntity($note));
+
+        if ($parent instanceof Entity) {
+            $notification->setRelatedParent($parent);
+            $data['entityName'] = $parent->get('name');
+        }
+
+        $notification->setData($data);
+
+        $this->entityManager->saveEntity($notification);
+    }
+
+    private function isEnabledForUser(string $recipientId): bool
+    {
+        $recipientPreferences = $this->entityManager->getRepositoryByClass(Preferences::class)->getById($recipientId);
+
+        return $recipientPreferences && $recipientPreferences->get('reactionNotifications');
+    }
+
+    public function removeNoteUnread(Note $note, User $user, ?string $type = null): void
+    {
+        /** @var Notification[] $notifications */
+        $notifications = $this->entityManager
+            ->getRDBRepositoryByClass(Notification::class)
+            ->where([
+                'read' => false,
+                'createdById' => $user->getId(),
+                'type' => Notification::TYPE_USER_REACTION,
+                'relatedId' => $note->getId(),
+                'relatedType' => $note->getEntityType(),
+            ])
+            ->find();
+
+        foreach ($notifications as $notification) {
+            if ($type && $notification->getData()?->type !== $type) {
+                continue;
+            }
+
+            $this->entityManager->removeEntity($notification);
+        }
+    }
+}
diff --git a/application/Espo/Tools/UserReaction/ReactionStreamService.php b/application/Espo/Tools/UserReaction/ReactionStreamService.php
new file mode 100644
index 0000000000..d17e396832
--- /dev/null
+++ b/application/Espo/Tools/UserReaction/ReactionStreamService.php
@@ -0,0 +1,144 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Tools\UserReaction;
+
+use Espo\Core\Exceptions\BadRequest;
+use Espo\Core\Exceptions\Forbidden;
+use Espo\Core\Exceptions\NotFound;
+use Espo\Core\Field\DateTime;
+use Espo\Core\Select\SearchParams;
+use Espo\Core\Select\Where\Item;
+use Espo\Core\Utils\Config;
+use Espo\Entities\Note;
+use Espo\Entities\User;
+use Espo\Entities\UserReaction;
+use Espo\ORM\EntityManager;
+use Espo\ORM\Query\SelectBuilder;
+use Espo\Tools\Stream\UserRecordService;
+use stdClass;
+
+class ReactionStreamService
+{
+    private const MAX_NOTE_COUNT = 100;
+    private const MAX_PERIOD = '2 hours';
+
+    public function __construct(
+        private EntityManager $entityManager,
+        private UserRecordService $userRecordService,
+        private User $user,
+        private Config $config,
+    ) {}
+
+
+    /**
+     * Get reaction updates.
+     *
+     * @param string[] $noteIds
+     * @return stdClass[]
+     * @throws Forbidden
+     * @throws BadRequest
+     * @throws NotFound
+     * @internal
+     */
+    public function getReactionUpdates(DateTime $after, array $noteIds, ?string $userId): array
+    {
+        if (count($noteIds) > $this->getMaxCount()) {
+            throw new Forbidden("Too many note IDs.");
+        }
+
+        $userId ??= $this->user->getId();
+
+        $after = $this->getAfter($after);
+
+        $updatedIds = [];
+
+        $query = SelectBuilder::create()
+            ->from(UserReaction::ENTITY_TYPE)
+            ->select('parentId')
+            ->where([
+                'parentId' => $noteIds,
+                'parentType' => Note::ENTITY_TYPE,
+                'createdAt>=' => $after->toString(),
+            ])
+            ->group('parentId')
+            ->build();
+
+        /** @var array{parentId: string}[] $rows */
+        $rows = $this->entityManager->getQueryExecutor()->execute($query)->fetchAll();
+
+        foreach ($rows as $row) {
+            $updatedIds[] = $row['parentId'];
+        }
+
+        if (!$updatedIds) {
+            return [];
+        }
+
+        $searchParams = SearchParams::create()
+            ->withSelect(['id', 'reactionCounts', 'myReactions'])
+            ->withWhereAdded(
+                Item::createBuilder()
+                    ->setType(Item\Type::IN)
+                    ->setAttribute('id')
+                    ->setValue($updatedIds)
+                    ->build()
+            );
+
+        $updatedNotes = $this->userRecordService->find($userId, $searchParams);
+
+        $result = [];
+
+        foreach ($updatedNotes->getCollection() as $note) {
+            $result[] = (object) [
+                'id' => $note->getId(),
+                'myReactions' => $note->get('myReactions'),
+                'reactionCounts' => $note->get('reactionCounts')
+            ];
+        }
+
+        return $result;
+    }
+
+    private function getAfter(DateTime $after): DateTime
+    {
+        $afterMax = DateTime::createNow()->modify('-' . self::MAX_PERIOD);
+
+        if ($afterMax->isGreaterThan($after)) {
+            $after = $afterMax;
+        }
+
+        return $after;
+    }
+
+    private function getMaxCount(): int
+    {
+        return $this->config->get('streamReactionsCheckMaxSize') ?? self::MAX_NOTE_COUNT;
+    }
+}
diff --git a/client/res/templates/record/row-actions/default.tpl b/client/res/templates/record/row-actions/default.tpl
index 77a5ab2491..6d7fb3d390 100644
--- a/client/res/templates/record/row-actions/default.tpl
+++ b/client/res/templates/record/row-actions/default.tpl
@@ -8,17 +8,23 @@
     <ul class="dropdown-menu pull-right list-row-dropdown-menu" data-id="{{model.id}}">
     {{#each actionList}}
         {{#if this}}
-            <li>
-                <a
-                        {{#if link}}href="{{link}}"{{else}}role="button"{{/if}}
-                        tabindex="0"
-                        class="action"
-                        {{#if action}}data-action="{{action}}"{{/if}}
-                    {{#each data}}
-                        data-{{hyphen @key}}="{{./this}}"
-                    {{/each}}
-                >{{#if html}}{{{html}}}{{else}}{{#if text}}{{text}}{{else}}{{translate label scope=../scope}}{{/if}}{{/if}}
-                </a>
+            <li
+                {{#if viewKey}} data-view-key="{{viewKey}}" {{/if}}
+            >
+                {{#if viewKey}}
+                    {{{lookup ../this viewKey}}}
+                {{else}}
+                    <a
+                        {{#if link}} href="{{link}}" {{else}} role="button" {{/if}}
+                            tabindex="0"
+                            class="action"
+                            {{#if action}}data-action="{{action}}"{{/if}}
+                        {{#each data}}
+                            data-{{hyphen @key}}="{{./this}}"
+                        {{/each}}
+                    >{{#if html}}{{{html}}}{{else}}{{#if text}}{{text}}{{else}}{{translate label scope=../scope}}{{/if}}{{/if}}
+                    </a>
+                {{/if}}
             </li>
         {{else}}
             {{#unless @first}}
diff --git a/client/res/templates/stream/notes/post.tpl b/client/res/templates/stream/notes/post.tpl
index e7d84f352a..48ba78dd4e 100644
--- a/client/res/templates/stream/notes/post.tpl
+++ b/client/res/templates/stream/notes/post.tpl
@@ -36,4 +36,5 @@
     {{#if isPinned}}
         <span class="fas fa-map-pin fa-sm pin-icon" title="{{translate 'Pinned' scope='Note'}}"></span>
     {{/if}}
+    <div class="reactions-container">{{{reactions}}}</div>
 </div>
diff --git a/client/src/collections/note.js b/client/src/collections/note.js
index 4c4a471839..00f62ec88c 100644
--- a/client/src/collections/note.js
+++ b/client/src/collections/note.js
@@ -34,11 +34,22 @@ class NoteCollection extends Collection {
 
     paginationByNumber = false
 
+    /**
+     * @private
+     * @type {string|null}
+     */
+    reactionsCheckDate = null
+
     /**
      * @type {Record[]}
      */
     pinnedList
 
+    /**
+     * @type {number}
+     */
+    reactionsCheckMaxSize = 0;
+
     /** @inheritDoc */
     prepareAttributes(response, params) {
         const total = this.total;
@@ -54,6 +65,24 @@ class NoteCollection extends Collection {
             this.pinnedList = Espo.Utils.cloneDeep(response.pinnedList);
         }
 
+        this.reactionsCheckDate = response.reactionsCheckDate;
+
+        /** @type {Record[]} */
+        const updatedReactions = response.updatedReactions;
+
+        if (updatedReactions) {
+            updatedReactions.forEach(item => {
+                const model = this.get(item.id);
+
+                if (!model) {
+                    return;
+                }
+
+                model.set(item, {keepRowActions: true});
+
+            });
+        }
+
         return list;
     }
 
@@ -76,6 +105,16 @@ class NoteCollection extends Collection {
             options.remove = false;
             options.at = 0;
             options.maxSize = null;
+
+            if (this.reactionsCheckMaxSize) {
+                options.data.reactionsAfter = this.reactionsCheckDate || options.data.after;
+
+                options.data.reactionsCheckNoteIds = this.models
+                    .filter(model => model.attributes.type === 'Post')
+                    .map(model => model.id)
+                    .slice(0, this.reactionsCheckMaxSize)
+                    .join(',');
+            }
         }
 
         return this.fetch(options);
diff --git a/client/src/handlers/note/record-detail-setup.js b/client/src/handlers/note/record-detail-setup.js
new file mode 100644
index 0000000000..d3b9a2ab0b
--- /dev/null
+++ b/client/src/handlers/note/record-detail-setup.js
@@ -0,0 +1,55 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+export default class {
+
+    /**
+     * @param {import('views/record/detail').default} view
+     */
+    constructor(view) {
+        this.view = view;
+    }
+
+    process() {
+        this.controlFields();
+
+        this.view.listenTo(this.view.model, 'sync', () => this.controlFields());
+    }
+
+    controlFields() {
+        const attachmentsIds = this.view.model.attributes.attachmentsIds;
+
+        if (!attachmentsIds || !attachmentsIds.length) {
+            this.view.hideField('attachments');
+
+            return;
+        }
+
+        this.view.showField('attachments');
+    }
+}
diff --git a/client/src/helpers/misc/reactions.js b/client/src/helpers/misc/reactions.js
new file mode 100644
index 0000000000..17e6087016
--- /dev/null
+++ b/client/src/helpers/misc/reactions.js
@@ -0,0 +1,83 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+class ReactionsHelper {
+
+    /**
+     * @param {import('models/settings').default} config
+     * @param {import('metadata').default} metadata
+     */
+    constructor(config, metadata) {
+        /** @private */
+        this.config = config;
+        /** @private */
+        this.metadata = metadata;
+
+        /**
+         * @private
+         * @type {{
+         *     type: string,
+         *     iconClass: string,
+         * }[]}
+         */
+        this.list = metadata.get('app.reactions.list') || [];
+    }
+
+    /**
+     * @return {{
+     *     type: string,
+     *     iconClass: string,
+     * }[]}
+     */
+    getDefinitionList() {
+        return this.list;
+    }
+
+    /**
+     * @return {string[]}
+     */
+    getAvailableReactions() {
+        return this.config.get('availableReactions') || []
+    }
+
+    /**
+     * @param {string|null} type
+     * @return {string|null}
+     */
+    getIconClass(type) {
+        const item = this.list.find(it => it.type === type);
+
+        if (!item) {
+            return null;
+        }
+
+        return item.iconClass;
+    }
+}
+
+export default ReactionsHelper;
diff --git a/client/src/ui.js b/client/src/ui.js
index d1a3f313c8..fc6a0466f5 100644
--- a/client/src/ui.js
+++ b/client/src/ui.js
@@ -902,6 +902,8 @@ Espo.Ui = {
      * @property {boolean} [noHideOnOutsideClick=false] Don't hide on clicking outside.
      * @property {function(): void} [onShow] On-show callback.
      * @property {function(): void} [onHide] On-hide callback.
+     * @property {string|function(): string} [title] A title text.
+     * @property {boolean} [keepElementTitle] Keep an original element's title.
      */
 
     /**
@@ -910,7 +912,12 @@ Espo.Ui = {
      * @param {Element|JQuery} element An element.
      * @param {Espo.Ui~PopoverOptions} o Options.
      * @param {module:view} [view] A view.
-     * @return {{hide: function(), destroy: function(), show: function(), detach: function()}}
+     * @return {{
+     *     hide: function(),
+     *     destroy: function(),
+     *     show: function(): string,
+     *     detach: function(),
+     * }}
      */
     popover: function (element, o, view) {
         const $el = $(element);
@@ -935,6 +942,8 @@ Espo.Ui = {
                 html: true,
                 content: content,
                 trigger: o.trigger || 'manual',
+                title: o.title,
+                keepElementTitle: o.keepElementTitle,
             })
             .on('shown.bs.popover', () => {
                 isShown = true;
@@ -1021,6 +1030,8 @@ Espo.Ui = {
         const show = () => {
             // noinspection JSUnresolvedReference
             $el.popover('show');
+
+            return $el.attr('aria-describedby');
         };
 
         if (view) {
diff --git a/client/src/views/modal.js b/client/src/views/modal.js
index b2fddc5764..4498992bfd 100644
--- a/client/src/views/modal.js
+++ b/client/src/views/modal.js
@@ -387,6 +387,10 @@ class ModalView extends View {
             if (!this.noFullHeight) {
                 this.initBodyScrollListener();
             }
+
+            if (this.getParentView()) {
+                this.getParentView().trigger('modal-shown');
+            }
         });
 
         this.once('remove', () => {
diff --git a/client/src/views/notification/fields/container.js b/client/src/views/notification/fields/container.js
index c47e1b39f4..4e253918a2 100644
--- a/client/src/views/notification/fields/container.js
+++ b/client/src/views/notification/fields/container.js
@@ -41,10 +41,11 @@ class NotificationContainerFieldView extends BaseFieldView {
         'EntityRemoved',
         'Message',
         'System',
+        'UserReaction',
     ]
 
     setup() {
-        switch (this.model.get('type')) {
+        switch (this.model.attributes.type) {
             case 'Note':
                 this.processNote(this.model.get('noteData'));
 
diff --git a/client/src/views/notification/items/base.js b/client/src/views/notification/items/base.js
index bbb1fedf40..34ebb3e07b 100644
--- a/client/src/views/notification/items/base.js
+++ b/client/src/views/notification/items/base.js
@@ -111,14 +111,22 @@ class BaseNotificationItemView extends View {
 
         string = string.toLowerCase();
 
-        const language = this.getPreferences().get('language') || this.getConfig().get('language');
-
-        if (['de_DE', 'nl_NL'].includes(language)) {
+        if (this.toUpperCaseFirstLetter()) {
             string = Espo.Utils.upperCaseFirst(string);
         }
 
         return string;
     }
+
+    /**
+     * @property
+     * @return {boolean}
+     */
+    toUpperCaseFirstLetter() {
+        const language = this.getPreferences().get('language') || this.getConfig().get('language');
+
+        return ['de_DE', 'nl_NL'].includes(language);
+    }
 }
 
 export default BaseNotificationItemView;
diff --git a/client/src/views/notification/items/user-reaction.js b/client/src/views/notification/items/user-reaction.js
new file mode 100644
index 0000000000..53656998b7
--- /dev/null
+++ b/client/src/views/notification/items/user-reaction.js
@@ -0,0 +1,120 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+import BaseNotificationItemView from 'views/notification/items/base';
+import ReactionsHelper from 'helpers/misc/reactions';
+
+// noinspection JSUnusedGlobalSymbols
+export default class UserReactionNotificationItemView extends BaseNotificationItemView {
+
+    // language=Handlebars
+    templateContent = `
+        <div class="stream-head-container">
+            <div class="pull-left">
+                {{{avatar}}}
+            </div>
+            <div class="stream-head-text-container">
+                <span class="{{reactionIconClass}} text-muted"></span>
+                <span class="text-muted message">
+                    {{{message}}}
+                </span>
+            </div>
+        </div>
+
+        <div class="stream-date-container">
+            <span class="text-muted small">{{{createdAt}}}</span>
+        </div>
+    `
+
+    messageName = 'userPostReaction'
+
+    /**
+     * @private
+     * @type {string|null}
+     */
+    reactionIconClass
+
+
+    data() {
+        return {
+            ...super.data(),
+            reactionIconClass: this.reactionIconClass,
+        };
+    }
+
+    setup() {
+        const data = /** @type {Object.<string, *>} */this.model.attributes.data || {};
+
+        const relatedParentId = this.model.attributes.relatedParentId;
+        const relatedParentType = this.model.attributes.relatedParentType;
+
+        this.userId = this.model.attributes.createdById;
+
+        this.messageData['type'] = this.translate(data.type, 'reactions');
+
+        const reactionsHelper = new ReactionsHelper(this.getConfig(), this.getMetadata());
+        this.reactionIconClass = reactionsHelper.getIconClass(data.type);
+
+        const userElement = document.createElement('a');
+        userElement.href = `#User/view/${this.model.attributes.createdById}`;
+        userElement.dataset.id = this.model.attributes.createdById;
+        userElement.dataset.scope = 'User';
+        userElement.textContent = this.model.attributes.createdByName;
+
+        this.messageData['user'] = userElement;
+
+        if (relatedParentId && relatedParentType) {
+            const relatedParentElement = document.createElement('a');
+            relatedParentElement.href = `#${relatedParentType}/view/${relatedParentId}`;
+            relatedParentElement.dataset.id = relatedParentId;
+            relatedParentElement.dataset.scope = relatedParentType;
+            relatedParentElement.textContent = data.entityName || relatedParentType;
+
+            this.messageData['entityType'] = this.translateEntityType(relatedParentType);
+            this.messageData['entity'] = relatedParentElement;
+
+            this.messageName = 'userPostInParentReaction';
+        }
+
+        let postLabel = this.getLanguage().translateOption('Post', 'type', 'Note');
+
+        if (!this.toUpperCaseFirstLetter()) {
+            postLabel = Espo.Utils.lowerCaseFirst(postLabel);
+        }
+
+        const postElement = document.createElement('a');
+        postElement.href = `#Note/view/${this.model.attributes.relatedId}`;
+        postElement.dataset.id = this.model.attributes.relatedId;
+        postElement.dataset.scope = 'Note';
+        postElement.textContent = postLabel;
+
+        this.messageData['post'] = postElement;
+
+        this.createMessage();
+    }
+}
diff --git a/client/src/views/record/row-actions/default.js b/client/src/views/record/row-actions/default.js
index 6b7db04a16..39074aedd8 100644
--- a/client/src/views/record/row-actions/default.js
+++ b/client/src/views/record/row-actions/default.js
@@ -40,6 +40,8 @@ import View from 'view';
  *     groupIndex?: number,
  *     name?: string,
  *     text?: string,
+ *     html?: string,
+ *     viewKey?: string,
  * }} module:views/record/row-actions/actions~item
  */
 
@@ -62,7 +64,13 @@ class DefaultRowActionsView extends View {
 
         this.setupAdditionalActions();
 
-        this.listenTo(this.model, 'change', () => this.reRender());
+        this.listenTo(this.model, 'change', (m, /** Record */o) => {
+            if (o.keepRowActions) {
+                return;
+            }
+
+            this.reRender();
+        });
     }
 
     afterRender() {
diff --git a/client/src/views/settings/fields/available-reactions.js b/client/src/views/settings/fields/available-reactions.js
new file mode 100644
index 0000000000..dfbe57a73d
--- /dev/null
+++ b/client/src/views/settings/fields/available-reactions.js
@@ -0,0 +1,129 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+import ArrayFieldView from 'views/fields/array';
+import ReactionsHelper from 'helpers/misc/reactions';
+
+// noinspection JSUnusedGlobalSymbols
+export default class extends ArrayFieldView {
+
+    /**
+     * @type {Object.<string, string>}
+     * @private
+     */
+    iconClassMap
+
+    /**
+     * @private
+     * @type {ReactionsHelper}
+     */
+    reactionsHelper
+
+    setup() {
+        this.reactionsHelper = new ReactionsHelper(this.getConfig(), this.getMetadata());
+
+        this.iconClassMap = this.reactionsHelper.getDefinitionList().reduce((o, it) => {
+            return {
+                [it.type]: it.iconClass,
+                ...o,
+            };
+        }, {});
+
+        super.setup();
+    }
+
+    setupOptions() {
+        const list = this.reactionsHelper.getDefinitionList();
+
+        this.params.options = list.map(it => it.type);
+
+        this.translatedOptions = list.reduce((o, it) => {
+            return {
+                [it.type]: this.translate(it.type, 'reactions'),
+                ...o
+            };
+        }, {});
+    }
+
+    /**
+     * @param {string} value
+     * @return {string}
+     */
+    getItemHtml(value) {
+        const html = super.getItemHtml(value);
+
+        const item = /** @type {HTMLElement} */
+            new DOMParser().parseFromString(html, 'text/html').body.childNodes[0];
+
+        const icon = this.createIconElement(value);
+
+        item.prepend(icon);
+
+        return item.outerHTML;
+    }
+
+    /**
+     * @private
+     * @param {string} value
+     * @return {HTMLSpanElement}
+     */
+    createIconElement(value) {
+        const icon = document.createElement('span');
+
+        (this.iconClassMap[value] || '')
+            .split(' ')
+            .filter(it => it)
+            .forEach(it => icon.classList.add(it));
+
+        icon.classList.add('text-soft');
+        icon.style.display = 'inline-block';
+        icon.style.width = 'var(--24px)';
+
+        return icon;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    async actionAddItem() {
+        const view = await super.actionAddItem();
+
+        view.whenRendered().then(() => {
+            const anchors = /** @type {HTMLAnchorElement[]} */
+                view.element.querySelectorAll(`a[data-value]`);
+
+            anchors.forEach(a => {
+                const icon = this.createIconElement(a.dataset.value);
+
+                a.prepend(icon);
+            });
+        });
+
+        return view;
+    }
+}
diff --git a/client/src/views/stream/note.js b/client/src/views/stream/note.js
index 9b24cfa25f..abce69469e 100644
--- a/client/src/views/stream/note.js
+++ b/client/src/views/stream/note.js
@@ -123,6 +123,7 @@ class NoteStreamView extends View {
                 listType: this.listType,
                 isThis: this.isThis,
                 parentModel: this.parentModel,
+                isNotification: this.options.isNotification,
             });
         }
     }
diff --git a/client/src/views/stream/notes/post.js b/client/src/views/stream/notes/post.js
index 2080cf1fa5..7ace21d6ee 100644
--- a/client/src/views/stream/notes/post.js
+++ b/client/src/views/stream/notes/post.js
@@ -27,6 +27,7 @@
  ************************************************************************/
 
 import NoteStreamView from 'views/stream/note';
+import NoteReactionsView from 'views/stream/reactions';
 
 class PostNoteStreamView extends NoteStreamView {
 
@@ -49,6 +50,9 @@ class PostNoteStreamView extends NoteStreamView {
     }
 
     setup() {
+        this.addActionHandler('react', (e, target) => this.react(target.dataset.type));
+        this.addActionHandler('unReact', (e, target) => this.unReact(target.dataset.type));
+
         this.createField('post', null, null, 'views/stream/fields/post');
 
         this.createField('attachments', 'attachmentMultiple', {}, 'views/stream/fields/attachment-multiple', {
@@ -57,6 +61,8 @@ class PostNoteStreamView extends NoteStreamView {
 
         this.isInternal = this.model.get('isInternal');
 
+        this.setupReactions();
+
         if (!this.model.get('post') && this.model.get('parentId')) {
             this.messageName = 'attach';
 
@@ -213,6 +219,64 @@ class PostNoteStreamView extends NoteStreamView {
 
         this.createMessage();
     }
+
+    /**
+     * @private
+     * @param {string} type
+     */
+    async react(type) {
+        Espo.Ui.notify(' ... ');
+
+        const previousMyReactions = this.model.attributes.myReactions;
+
+        this.model.set({myReactions: [type]}, {userReaction: true});
+
+        try {
+            await Espo.Ajax.postRequest(`Note/${this.model.id}/myReactions/${type}`);
+        } catch (e) {
+            this.model.set({myReactions: previousMyReactions}, {userReaction: true});
+
+            return;
+        }
+
+        Espo.Ui.success(this.translate('Reacted') + ' · ' + this.translate(type, 'reactions'));
+
+        await this.model.fetch({userReaction: true, keepRowActions: true});
+    }
+
+    /**
+     * @private
+     * @param {string} type
+     */
+    async unReact(type) {
+        Espo.Ui.notify(' ... ');
+
+        const previousMyReactions = this.model.attributes.myReactions;
+
+        this.model.set({myReactions: []}, {userReaction: true});
+
+        try {
+            await Espo.Ajax.deleteRequest(`Note/${this.model.id}/myReactions/${type}`);
+        } catch (e) {
+            this.model.set({myReactions: previousMyReactions}, {userReaction: true});
+
+            return;
+        }
+
+        Espo.Ui.warning(this.translate('Reaction Removed'));
+
+        await this.model.fetch({userReaction: true, keepRowActions: true});
+    }
+
+    /**
+     * @private
+     */
+    setupReactions() {
+        const view = new NoteReactionsView({model: this.model});
+        this.assignView('reactions', view, '.reactions-container');
+
+        this.listenTo(this.model, 'change:reactionCounts change:myReactions', () => view.reRenderWhenNoPopover());
+    }
 }
 
 export default PostNoteStreamView;
diff --git a/client/src/views/stream/panel.js b/client/src/views/stream/panel.js
index 4f9b101649..40748e7c29 100644
--- a/client/src/views/stream/panel.js
+++ b/client/src/views/stream/panel.js
@@ -338,7 +338,7 @@ class PanelStreamView extends RelationshipPanelView {
                 const model = this.collection.get(data.noteId);
 
                 if (model) {
-                    model.fetch()
+                    model.fetch({keepRowActions: true})
                         .then(() => this.syncPinnedModel(model, true));
                 }
 
@@ -463,6 +463,13 @@ class PanelStreamView extends RelationshipPanelView {
             }, view => {
                 view.render();
 
+                this.listenTo(this.pinnedCollection, 'change',
+                    (/** import('model').default */model, /** Record */o) => {
+                        if (o.userReaction) {
+                            this.syncPinnedModel(model, false);
+                        }
+                    });
+
                 this.listenTo(view, 'after:save', /** import('model').default */model => {
                     this.syncPinnedModel(model, false);
                 });
@@ -493,6 +500,13 @@ class PanelStreamView extends RelationshipPanelView {
                     this.syncPinnedModel(model, true);
                 });
 
+                this.listenTo(this.collection, 'change',
+                    (/** import('model').default */model, /** Record */o) => {
+                        if (o.userReaction) {
+                            this.syncPinnedModel(model, true);
+                        }
+                    });
+
                 this.listenTo(view, 'quote-reply', /** string */quoted => this.quoteReply(quoted));
             }
         });
@@ -619,6 +633,8 @@ class PanelStreamView extends RelationshipPanelView {
             attachmentsNames: model.attributes.attachmentsNames,
             attachmentsTypes: model.attributes.attachmentsTypes,
             data: model.attributes.data,
+            reactionCounts: model.attributes.reactionCounts,
+            myReactions: model.attributes.myReactions,
         });
     }
 
diff --git a/client/src/views/stream/reactions.js b/client/src/views/stream/reactions.js
new file mode 100644
index 0000000000..089f31b981
--- /dev/null
+++ b/client/src/views/stream/reactions.js
@@ -0,0 +1,202 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+import View from 'view';
+import Collection from 'collection';
+import ListRecordView from 'views/record/list';
+import ReactionsHelper from 'helpers/misc/reactions';
+
+export default class NoteReactionsView extends View {
+
+    // language=Handlebars
+    templateContent = `
+        {{#each dataList}}
+            <a
+                class="reaction-count small text-soft"
+                role="button"
+                title="{{label}}"
+                data-type="{{type}}"
+            >
+                <span data-role="icon" class="{{iconClass}} {{#if reacted}} text-primary {{/if}}"></span>
+                <span data-role="count">{{count}}</span>
+            </a>
+        {{/each}}
+    `
+
+    /**
+     * @private
+     * @type {string[]}
+     */
+    availableReactions
+
+    /**
+     * @type {Object.<string, string>}
+     * @private
+     */
+    iconClassMap
+
+    /**
+     * @private
+     * @type {{destroy: function(), show: function()}}
+     */
+    popover
+
+    /**
+     * @param {{
+     *     model: import('model').default,
+     * }} options
+     */
+    constructor(options) {
+        super(options);
+    }
+
+    data() {
+        /** @type {Record.<string, number>} */
+        const counts = this.model.attributes.reactionCounts || {};
+        /** @type {string[]} */
+        const myReactions = this.model.attributes.myReactions || [];
+
+        return {
+            dataList: this.availableReactions
+                .filter(type => counts[type])
+                .map(type => {
+                    return {
+                        type: type,
+                        count: counts[type].toString(),
+                        label: this.translate('Reactions') +  ' · ' + this.translate(type, 'reactions'),
+                        iconClass: this.iconClassMap[type],
+                        reacted: myReactions.includes(type),
+                    };
+                }),
+        }
+    }
+
+    setup() {
+        const reactionsHelper = new ReactionsHelper(this.getConfig(), this.getMetadata());
+
+        this.availableReactions = reactionsHelper.getAvailableReactions();
+
+        const list = reactionsHelper.getDefinitionList();
+
+        this.iconClassMap = list.reduce((o, it) => {
+            return {[it.type]: it.iconClass, ...o};
+        }, {});
+
+        this.addHandler('click', 'a.reaction-count', (e, target) => this.showUsers(target.dataset.type));
+    }
+
+    /**
+     * @private
+     * @param {string} type
+     */
+    async showUsers(type) {
+        const a = this.element.querySelector(`a.reaction-count[data-type="${type}"]`);
+
+        /*if (this.popover) {
+            this.popover.destroy();
+        }*/
+
+        const popover = Espo.Ui.popover(a, {
+            placement: 'bottom',
+            content: `
+                <div class="center-align for-list-view">
+                    <span class="fas fa-spinner fa-spin text-soft"></span>
+                </div>
+            `,
+            preventDestroyOnRender: true,
+            noToggleInit: true,
+            keepElementTitle: true,
+            title: this.translate('Reactions') +  ' · ' + this.translate(type, 'reactions'),
+            onHide: () => {
+                this.popover = undefined;
+
+                this.trigger('popover-hidden');
+            },
+        }, this);
+
+        this.popover = popover;
+
+        const id = popover.show();
+
+        document.querySelector(`#${id}`).classList.add('popover-list-view');
+
+        const selector = `#${id} .popover-content`;
+
+        /** @type {HTMLElement|null} */
+        const container = document.querySelector(selector);
+
+        /** @type {import('collection').default} */
+        const users = await this.getCollectionFactory().create('User');
+
+        users.url = `Note/${this.model.id}/reactors/${type}`;
+        users.maxSize = this.getConfig().get('recordsPerPageSmall') || 5;
+
+        await users.fetch();
+
+        if (!document.body.contains(container)) {
+            popover.hide();
+
+            return;
+        }
+
+        const listView = new ListRecordView({
+            collection: users,
+            listLayout: [
+                {
+                    name: 'name',
+                    view: 'views/user/fields/name',
+                    link: true,
+                }
+            ],
+            checkboxes: false,
+            displayTotalCount: false,
+            headerDisabled: true,
+            buttonsDisabled: true,
+            rowActionsDisabled: true,
+        });
+
+        await this.assignView('users', listView);
+
+        listView.setSelector(selector);
+
+        await listView.render();
+
+        this.listenToOnce(listView, 'modal-shown', () => popover.destroy());
+    }
+
+    // @todo Prevent popover disappearing.
+    reRenderWhenNoPopover() {
+        if (this.popover) {
+            this.once('popover-hidden', () => this.reRender());
+
+            return;
+        }
+
+        this.reRender();
+    }
+}
diff --git a/client/src/views/stream/record/list.js b/client/src/views/stream/record/list.js
index aec0f70e46..5697bf6540 100644
--- a/client/src/views/stream/record/list.js
+++ b/client/src/views/stream/record/list.js
@@ -36,7 +36,16 @@ class ListStreamRecordView extends ListExpandedRecordView {
 
     massActionsDisabled = true
 
+
+    /**
+     * @private
+     * @type {boolean}
+     */
+    isUserStream
+
     setup() {
+        this.isUserStream = this.options.isUserStream || false;
+
         this.itemViews = this.getMetadata().get('clientDefs.Note.itemViews') || {};
 
         super.setup();
@@ -47,6 +56,12 @@ class ListStreamRecordView extends ListExpandedRecordView {
             this.buildRows(() => this.reRender());
         });
 
+        if (this.isUserStream || this.model.entityType === 'User') {
+            const collection = /** @type {import('collections/note').default} */this.collection;
+
+            collection.reactionsCheckMaxSize = this.getConfig().get('streamReactionsCheckMaxSize') || 0;
+        }
+
         this.listenTo(this.collection, 'sync', (c, r, options) => {
             if (!options.fetchNew) {
                 return;
diff --git a/client/src/views/stream/record/row-actions/default.js b/client/src/views/stream/record/row-actions/default.js
index 37cae4f6bb..24483c0390 100644
--- a/client/src/views/stream/record/row-actions/default.js
+++ b/client/src/views/stream/record/row-actions/default.js
@@ -27,6 +27,8 @@
  ************************************************************************/
 
 import DefaultRowActionsView from 'views/record/row-actions/default';
+import ReactionsHelper from 'helpers/misc/reactions';
+import ReactionsRowActionView from 'views/stream/record/row-actions/reactions/reactions';
 
 class StreamDefaultNoteRowActionsView extends DefaultRowActionsView {
 
@@ -34,6 +36,18 @@ class StreamDefaultNoteRowActionsView extends DefaultRowActionsView {
 
     isDetached = false
 
+    /**
+     * @private
+     * @type {string[]}
+     */
+    availableReactions
+
+    /**
+     * @private
+     * @type {ReactionsHelper}
+     */
+    reactionHelper
+
     setup() {
         super.setup();
 
@@ -46,6 +60,11 @@ class StreamDefaultNoteRowActionsView extends DefaultRowActionsView {
 
             this.pinnedMaxCount = this.getConfig().get('notePinnedMaxCount');
         }
+
+        // @todo Use service.
+        this.reactionHelper = new ReactionsHelper(this.getConfig(), this.getMetadata());
+
+        this.availableReactions = this.reactionHelper.getAvailableReactions();
     }
 
     getActionList() {
@@ -117,6 +136,96 @@ class StreamDefaultNoteRowActionsView extends DefaultRowActionsView {
             });
         }
 
+        if (this.hasReactions()) {
+            this.getReactionItems().forEach(item => list.push(item));
+        }
+
+        return list;
+    }
+
+    /**
+     * @private
+     * @return {boolean}
+     */
+    hasReactions() {
+        return this.model.attributes.type === 'Post' &&
+            this.availableReactions.length &&
+            !this.options.isNotification;
+    }
+
+    async prepareRender() {
+        if (!this.hasReactions() || this.availableReactions.length === 1) {
+            return;
+        }
+
+        const reactionsView = new ReactionsRowActionView({
+            reactions: this.availableReactions.map(type => {
+                return {
+                    type: type,
+                    iconClass: this.reactionHelper.getIconClass(type),
+                    label: this.translate(type, 'reactions'),
+                    isReacted: this.isUserReacted(type),
+                };
+            }),
+        });
+
+        await this.assignView('reactions', reactionsView, '[data-view-key="reactions"]');
+    }
+
+    /**
+     * @private
+     * @param {string} type
+     * @return {boolean}
+     */
+    isUserReacted(type) {
+        /** @type {string[]} */
+        const myReactions = this.model.attributes.myReactions || [];
+
+        return myReactions.includes(type);
+    }
+
+    /**
+     * @private
+     * @return {module:views/record/row-actions/actions~item[]}
+     */
+    getReactionItems() {
+        const list = [];
+
+        if (this.availableReactions.length > 1) {
+            return [{
+                viewKey: 'reactions',
+                groupIndex: 11,
+            }];
+        }
+
+        this.availableReactions.forEach(type => {
+            const iconClass = this.reactionHelper.getIconClass(type);
+
+            const label = this.getHelper().escapeString(this.translate(type, 'reactions'));
+
+            let html = iconClass ?
+                `<span class="${iconClass} text-soft item-icon"></span><span class="item-text">${label}</span>` :
+                label;
+
+            const reacted = this.isUserReacted(type);
+
+            if (reacted) {
+                html =
+                    `<span class="check-icon fas fa-check pull-right"></span>` +
+                    `<div>${html}</div>`;
+            }
+
+            list.push({
+                action: reacted ? 'unReact' : 'react',
+                html: html,
+                data: {
+                    id: this.model.id,
+                    type: type,
+                },
+                groupIndex: 3,
+            });
+        });
+
         return list;
     }
 }
diff --git a/client/src/views/stream/record/row-actions/reactions/reactions.js b/client/src/views/stream/record/row-actions/reactions/reactions.js
new file mode 100644
index 0000000000..951d6862fa
--- /dev/null
+++ b/client/src/views/stream/record/row-actions/reactions/reactions.js
@@ -0,0 +1,72 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2024 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+import View from 'view';
+
+export default class ReactionsRowActionView extends View {
+
+    // language=Handlebars
+    templateContent = `
+        <div class="item-icon-grid">
+            {{#each reactions}}
+                <a
+                    role="button"
+                    {{#if isReacted}}
+                        data-action="unReact"
+                    {{else}}
+                        data-action="react"
+                    {{/if}}
+                    data-type="{{type}}"
+                    title="{{label}}"
+                    class=" {{#if isReacted}} text-primary {{else}} text-soft {{/if}}"
+                ><span class="{{iconClass}}"></span></a>
+            {{/each}}
+        </div>
+    `
+    /**
+     * @param {{
+     *     reactions: {
+     *         type: string,
+     *         iconClass: string|null,
+     *         label: string,
+     *         isReacted: boolean,
+     *     }[]
+     * }} options
+     */
+    constructor(options) {
+        super(options);
+
+        this.reactions = options.reactions;
+    }
+
+    data() {
+        return {
+            reactions: this.reactions,
+        };
+    }
+}
diff --git a/frontend/less/espo/custom.less b/frontend/less/espo/custom.less
index 072811497e..37ed7d422f 100644
--- a/frontend/less/espo/custom.less
+++ b/frontend/less/espo/custom.less
@@ -2207,13 +2207,45 @@ td > span.color-icon {
 }
 
 .stream-date-container {
+    display: inline-block;
+    width: 100%;
+
     .pin-icon {
         display: inline-block;
         float: right;
-        position: relative;
-        top: var(--5px);
+        position: absolute;
+        right: var(--14px);
+        top: var(--36px);
+
         color: var(--text-muted-color);
     }
+
+    .reactions-container {
+        float: right;
+        display: inline-flex;
+        width: calc(100% - var(--190px));
+        flex-wrap: wrap;
+        column-gap: var(--12px);
+        row-gap: var(--4px);
+        padding-top: var(--3px);
+        justify-content: right;
+
+        a {
+            &:hover {
+                text-decoration: none;
+
+                span.text-primary {
+                    color: var(--brand-primary-10);
+                }
+            }
+
+            text-align: right;
+            min-width: var(--30px);
+
+
+
+        }
+    }
 }
 
 .stream-head-container {
@@ -3846,6 +3878,20 @@ body > .autocomplete-suggestions.text-search-suggestions {
     .popover-title {
         line-height: 1.5;
     }
+
+    &.popover-list-view {
+        width: var(--220px);
+    }
+
+    &:has(.for-list-view) {
+        width: var(--220px);
+    }
+
+    .popover-content {
+        &:has(> .list > table) {
+            padding: 0;
+        }
+    }
 }
 
 .input-group-item > .iti {
diff --git a/frontend/less/espo/elements/dropdown.less b/frontend/less/espo/elements/dropdown.less
index d5ceed70f3..d24690a962 100644
--- a/frontend/less/espo/elements/dropdown.less
+++ b/frontend/less/espo/elements/dropdown.less
@@ -146,6 +146,33 @@ ul.dropdown-menu-with-icons {
     }
 }
 
+ul.dropdown-menu {
+    > li {
+        a {
+            .item-icon + .item-text {
+                padding-left: var(--8px);
+            }
+        }
+    }
+
+    > li {
+        .item-icon-grid {
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(var(--34px), 1fr));
+
+            > a {
+                padding: var(--4px) var(--4px);
+                text-align: center;
+
+                &:hover {
+                    background-color: var(--dropdown-link-hover-bg);
+                }
+            }
+        }
+
+    }
+}
+
 .btn-group.open .dropdown-toggle {
     &.btn-text {
         box-shadow: none;
diff --git a/package-lock.json b/package-lock.json
index 26ee7918fb..3daa656014 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -16,7 +16,7 @@
         "autobahn-espo": "github:yurikuzn/autobahn-espo#0.1.0",
         "autonumeric": "^4.6.0",
         "backbone": "^1.3.3",
-        "bootstrap": "github:yurikuzn/espo-bootstrap#276c0c575c69a3d18109fbfed22ead867677bd4b",
+        "bootstrap": "github:yurikuzn/espo-bootstrap#0.1.1",
         "bootstrap-colorpicker": "^2.5.2",
         "bootstrap-datepicker": "^1.9.0",
         "bullbone": "github:yurikuzn/bull#1.2.16",
@@ -2584,9 +2584,8 @@
     },
     "node_modules/bootstrap": {
       "name": "bootstrap-for-espo",
-      "version": "0.1.0",
-      "resolved": "git+ssh://git@github.com/yurikuzn/espo-bootstrap.git#276c0c575c69a3d18109fbfed22ead867677bd4b",
-      "integrity": "sha512-tIm6wWhRIhxC8foUTO0DbsN3pBwVG+jKFyJNCHbQBfeHMxs7RsLNk1VRl9Layth4cTc0xS6C+HLbumOYpjGFRA==",
+      "version": "0.1.1",
+      "resolved": "git+ssh://git@github.com/yurikuzn/espo-bootstrap.git#99ba8bcd05ef0021c59179b5d0460624aa5f5976",
       "engines": {
         "node": ">=6"
       }
@@ -9999,9 +9998,8 @@
       }
     },
     "bootstrap": {
-      "version": "git+ssh://git@github.com/yurikuzn/espo-bootstrap.git#276c0c575c69a3d18109fbfed22ead867677bd4b",
-      "integrity": "sha512-tIm6wWhRIhxC8foUTO0DbsN3pBwVG+jKFyJNCHbQBfeHMxs7RsLNk1VRl9Layth4cTc0xS6C+HLbumOYpjGFRA==",
-      "from": "bootstrap@github:yurikuzn/espo-bootstrap#276c0c575c69a3d18109fbfed22ead867677bd4b"
+      "version": "git+ssh://git@github.com/yurikuzn/espo-bootstrap.git#99ba8bcd05ef0021c59179b5d0460624aa5f5976",
+      "from": "bootstrap@github:yurikuzn/espo-bootstrap#0.1.1"
     },
     "bootstrap-colorpicker": {
       "version": "2.5.2",
diff --git a/package.json b/package.json
index c8f16c6d6d..1baaa27847 100644
--- a/package.json
+++ b/package.json
@@ -44,7 +44,7 @@
     "autobahn-espo": "github:yurikuzn/autobahn-espo#0.1.0",
     "autonumeric": "^4.6.0",
     "backbone": "^1.3.3",
-    "bootstrap": "github:yurikuzn/espo-bootstrap#276c0c575c69a3d18109fbfed22ead867677bd4b",
+    "bootstrap": "github:yurikuzn/espo-bootstrap#0.1.1",
     "bootstrap-colorpicker": "^2.5.2",
     "bootstrap-datepicker": "^1.9.0",
     "bullbone": "github:yurikuzn/bull#1.2.16",
diff --git a/schema/metadata/app/reactions.json b/schema/metadata/app/reactions.json
new file mode 100644
index 0000000000..e8857f2fa2
--- /dev/null
+++ b/schema/metadata/app/reactions.json
@@ -0,0 +1,31 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "$id": "https://www.espocrm.com/schema/metadata/app/reactions.json",
+    "title": "app/language",
+    "description": "Reactions.",
+    "type": "object",
+    "properties": {
+        "list": {
+            "type": "array",
+            "description": "A list of available reactions.",
+            "items": {
+                "type": "object",
+                "required": [
+                    "type",
+                    "iconClass"
+                ],
+                "properties": {
+                    "type": {
+                        "type": "string",
+                        "maxLength": 10,
+                        "description": "A type."
+                    },
+                    "iconClass": {
+                        "type": "string",
+                        "description": "A CSS class for an icon."
+                    }
+                }
+            }
+        }
+    }
+}