diff --git a/src/api/gramjs/apiBuilders/messages.ts b/src/api/gramjs/apiBuilders/messages.ts
index d96db6019..d4bc07aad 100644
--- a/src/api/gramjs/apiBuilders/messages.ts
+++ b/src/api/gramjs/apiBuilders/messages.ts
@@ -286,7 +286,7 @@ function buildReactionCount(reactionCount: GramJs.ReactionCount): ApiReactionCou
 
 export function buildMessagePeerReaction(userReaction: GramJs.MessagePeerReaction): ApiUserReaction | undefined {
   const {
-    peerId, reaction, big, unread,
+    peerId, reaction, big, unread, date,
   } = userReaction;
 
   const apiReaction = buildApiReaction(reaction);
@@ -295,6 +295,7 @@ export function buildMessagePeerReaction(userReaction: GramJs.MessagePeerReactio
   return {
     userId: getApiChatIdFromMtpPeer(peerId),
     reaction: apiReaction,
+    addedDate: date,
     isUnread: unread,
     isBig: big,
   };
diff --git a/src/api/gramjs/methods/messages.ts b/src/api/gramjs/methods/messages.ts
index fb6af6949..d596a05a7 100644
--- a/src/api/gramjs/methods/messages.ts
+++ b/src/api/gramjs/methods/messages.ts
@@ -1416,7 +1416,13 @@ export async function fetchSeenBy({ chat, messageId }: { chat: ApiChat; messageI
     msgId: messageId,
   }));
 
-  return result ? result.map((readDate) => readDate.userId.toString()) : undefined;
+  return result
+    ? result.reduce((acc, readDate) => {
+      acc[readDate.userId.toString()] = readDate.date;
+
+      return acc;
+    }, {} as Record<string, number>)
+    : undefined;
 }
 
 export async function fetchSendAs({
diff --git a/src/api/types/messages.ts b/src/api/types/messages.ts
index 0ce9b3d8b..65007cf8e 100644
--- a/src/api/types/messages.ts
+++ b/src/api/types/messages.ts
@@ -428,7 +428,7 @@ export interface ApiMessage {
   isFromScheduled?: boolean;
   isSilent?: boolean;
   isPinned?: boolean;
-  seenByUserIds?: string[];
+  seenByDates?: Record<string, number>;
   isProtected?: boolean;
   isForwardingAllowed?: boolean;
   transcriptionId?: string;
@@ -453,6 +453,7 @@ export interface ApiUserReaction {
   reaction: ApiReaction;
   isBig?: boolean;
   isUnread?: boolean;
+  addedDate: number;
 }
 
 export interface ApiReactionCount {
diff --git a/src/components/common/PrivateChatInfo.tsx b/src/components/common/PrivateChatInfo.tsx
index 3fd13f473..0fd5eecfe 100644
--- a/src/components/common/PrivateChatInfo.tsx
+++ b/src/components/common/PrivateChatInfo.tsx
@@ -32,6 +32,7 @@ type OwnProps = {
   avatarSize?: 'tiny' | 'small' | 'medium' | 'large' | 'jumbo';
   forceShowSelf?: boolean;
   status?: string;
+  statusIcon?: string;
   withDots?: boolean;
   withMediaViewer?: boolean;
   withUsername?: boolean;
@@ -56,6 +57,7 @@ const PrivateChatInfo: FC<OwnProps & StateProps> = ({
   typingStatus,
   avatarSize = 'medium',
   status,
+  statusIcon,
   withDots,
   withMediaViewer,
   withUsername,
@@ -109,7 +111,10 @@ const PrivateChatInfo: FC<OwnProps & StateProps> = ({
       return withDots ? (
         <DotAnimation className="status" content={status} />
       ) : (
-        <span className="status" dir="auto">{renderText(status)}</span>
+        <span className="status" dir="auto">
+          {statusIcon && <i className={`icon ${statusIcon} status-icon`} />}
+          {renderText(status)}
+        </span>
       );
     }
 
diff --git a/src/components/common/SeenByModal.tsx b/src/components/common/SeenByModal.tsx
index 1092a5a7d..e3d1340b1 100644
--- a/src/components/common/SeenByModal.tsx
+++ b/src/components/common/SeenByModal.tsx
@@ -1,9 +1,9 @@
-import type { FC } from '../../lib/teact/teact';
-import React, { useCallback, memo } from '../../lib/teact/teact';
+import React, { useCallback, memo, useMemo } from '../../lib/teact/teact';
 import { getActions, withGlobal } from '../../global';
 
-import useLang from '../../hooks/useLang';
 import { selectChatMessage, selectTabState } from '../../global/selectors';
+import { formatDateAtTime } from '../../util/dateFormat';
+import useLang from '../../hooks/useLang';
 import useCurrentOrPrev from '../../hooks/useCurrentOrPrev';
 
 import Modal from '../ui/Modal';
@@ -16,15 +16,15 @@ export type OwnProps = {
 };
 
 export type StateProps = {
-  memberIds?: string[];
+  seenByDates?: Record<string, number>;
 };
 
 const CLOSE_ANIMATION_DURATION = 100;
 
-const SeenByModal: FC<OwnProps & StateProps> = ({
+function SeenByModal({
   isOpen,
-  memberIds,
-}) => {
+  seenByDates,
+}: OwnProps & StateProps) {
   const {
     openChat,
     closeSeenByModal,
@@ -32,6 +32,18 @@ const SeenByModal: FC<OwnProps & StateProps> = ({
 
   const lang = useLang();
 
+  const renderingSeenByDates = useCurrentOrPrev(seenByDates, true);
+  const memberIds = useMemo(() => {
+    if (!renderingSeenByDates) {
+      return undefined;
+    }
+
+    const result = Object.keys(renderingSeenByDates);
+    result.sort((leftId, rightId) => renderingSeenByDates[rightId] - renderingSeenByDates[leftId]);
+
+    return result;
+  }, [renderingSeenByDates]);
+
   const handleClick = useCallback((userId: string) => {
     closeSeenByModal();
 
@@ -44,8 +56,6 @@ const SeenByModal: FC<OwnProps & StateProps> = ({
     closeSeenByModal();
   }, [closeSeenByModal]);
 
-  const renderingMemberIds = useCurrentOrPrev(memberIds, true);
-
   return (
     <Modal
       isOpen={isOpen}
@@ -54,14 +64,19 @@ const SeenByModal: FC<OwnProps & StateProps> = ({
       title={`Seen by ${memberIds?.length} users`}
     >
       <div dir={lang.isRtl ? 'rtl' : undefined}>
-        {renderingMemberIds && renderingMemberIds.map((userId) => (
+        {memberIds && memberIds.map((userId) => (
           <ListItem
             key={userId}
             className="chat-item-clickable scroll-item small-icon"
             // eslint-disable-next-line react/jsx-no-bind
             onClick={() => handleClick(userId)}
           >
-            <PrivateChatInfo userId={userId} noStatusOrTyping />
+            <PrivateChatInfo
+              userId={userId}
+              noStatusOrTyping
+              status={formatDateAtTime(lang, renderingSeenByDates![userId] * 1000)}
+              statusIcon="icon-message-read"
+            />
           </ListItem>
         ))}
       </div>
@@ -76,7 +91,7 @@ const SeenByModal: FC<OwnProps & StateProps> = ({
       </div>
     </Modal>
   );
-};
+}
 
 export default memo(withGlobal<OwnProps>(
   (global): StateProps => {
@@ -86,7 +101,7 @@ export default memo(withGlobal<OwnProps>(
     }
 
     return {
-      memberIds: selectChatMessage(global, chatId, messageId)?.seenByUserIds,
+      seenByDates: selectChatMessage(global, chatId, messageId)?.seenByDates,
     };
   },
 )(SeenByModal));
diff --git a/src/components/middle/ReactorListModal.scss b/src/components/middle/ReactorListModal.scss
index 82283c2d1..dd88af977 100644
--- a/src/components/middle/ReactorListModal.scss
+++ b/src/components/middle/ReactorListModal.scss
@@ -5,6 +5,18 @@
 
   .modal-content {
     overflow: hidden;
+    height: min(92vh, 32rem);
+    display: flex;
+    flex-direction: column;
+  }
+
+  .reactor-list-wrapper {
+    flex-grow: 1;
+    min-height: 0;
+  }
+
+  .confirm-dialog-button {
+    align-self: flex-end;
   }
 
   .Reactions {
@@ -14,15 +26,15 @@
   .icon-heart {
     width: 1.125rem;
     height: 1.125rem;
-    margin-right: 0.25rem;
+    margin-inline-end: 0.25rem;
   }
 
   .reaction-filter-emoji {
-    margin-right: 0.25rem;
+    margin-inline-end: 0.25rem;
   }
 
   .reactor-list {
-    max-height: 400px;
+    max-height: 100%;
     overflow: auto;
     overflow-x: hidden;
   }
@@ -41,4 +53,8 @@
     height: 1.5rem;
     margin-inline-start: auto;
   }
+
+  .status {
+    color: var(--color-text-secondary);
+  }
 }
diff --git a/src/components/middle/ReactorListModal.tsx b/src/components/middle/ReactorListModal.tsx
index c1eaec065..1d3472f04 100644
--- a/src/components/middle/ReactorListModal.tsx
+++ b/src/components/middle/ReactorListModal.tsx
@@ -15,6 +15,7 @@ import buildClassName from '../../util/buildClassName';
 import { formatIntegerCompact } from '../../util/textFormat';
 import { unique } from '../../util/iteratees';
 import { isSameReaction, getReactionUniqueKey } from '../../global/helpers';
+import { formatDateAtTime } from '../../util/dateFormat';
 
 import useLang from '../../hooks/useLang';
 import useInfiniteScroll from '../../hooks/useInfiniteScroll';
@@ -28,6 +29,7 @@ import ListItem from '../ui/ListItem';
 import ReactionStaticEmoji from '../common/ReactionStaticEmoji';
 import Loading from '../ui/Loading';
 import FullNameTitle from '../common/FullNameTitle';
+import PrivateChatInfo from '../common/PrivateChatInfo';
 
 import './ReactorListModal.scss';
 
@@ -37,7 +39,7 @@ export type OwnProps = {
   isOpen: boolean;
 };
 
-export type StateProps = Pick<ApiMessage, 'reactors' | 'reactions' | 'seenByUserIds'> & {
+export type StateProps = Pick<ApiMessage, 'reactors' | 'reactions' | 'seenByDates'> & {
   chatId?: string;
   messageId?: number;
   availableReactions?: ApiAvailableReaction[];
@@ -49,7 +51,7 @@ const ReactorListModal: FC<OwnProps & StateProps> = ({
   reactions,
   chatId,
   messageId,
-  seenByUserIds,
+  seenByDates,
   availableReactions,
 }) => {
   const {
@@ -118,8 +120,11 @@ const ReactorListModal: FC<OwnProps & StateProps> = ({
         .filter(({ reaction }) => isSameReaction(reaction, chosenTab))
         .map(({ userId }) => userId);
     }
+
+    const seenByUserIds = Object.keys(seenByDates || {});
+
     return unique(reactors?.reactions.map(({ userId }) => userId).concat(seenByUserIds || []) || []);
-  }, [chosenTab, reactors, seenByUserIds]);
+  }, [chosenTab, reactors, seenByDates]);
 
   const [viewportIds, getMore] = useInfiniteScroll(
     handleLoadMore, userIds, reactors && reactors.nextOffset === undefined,
@@ -138,7 +143,7 @@ const ReactorListModal: FC<OwnProps & StateProps> = ({
       onCloseAnimationEnd={handleCloseAnimationEnd}
     >
       {canShowFilters && (
-        <div className="Reactions">
+        <div className="Reactions" dir={lang.isRtl ? 'rtl' : undefined}>
           <Button
             className={buildClassName(!chosenTab && 'chosen')}
             size="tiny"
@@ -173,7 +178,7 @@ const ReactorListModal: FC<OwnProps & StateProps> = ({
         </div>
       )}
 
-      <div dir={lang.isRtl ? 'rtl' : undefined}>
+      <div dir={lang.isRtl ? 'rtl' : undefined} className="reactor-list-wrapper">
         {viewportIds?.length ? (
           <InfiniteScroll
             className="reactor-list custom-scroll"
@@ -185,8 +190,11 @@ const ReactorListModal: FC<OwnProps & StateProps> = ({
                 const user = usersById[userId];
                 const userReactions = reactors?.reactions.filter((reactor) => reactor.userId === userId);
                 const items: React.ReactNode[] = [];
+                const seenByUser = seenByDates?.[userId];
+
                 userReactions?.forEach((r) => {
                   if (chosenTab && !isSameReaction(r.reaction, chosenTab)) return;
+
                   items.push(
                     <ListItem
                       key={`${userId}-${getReactionUniqueKey(r.reaction)}`}
@@ -195,7 +203,13 @@ const ReactorListModal: FC<OwnProps & StateProps> = ({
                       onClick={() => handleClick(userId)}
                     >
                       <Avatar user={user} size="small" />
-                      <FullNameTitle peer={user} withEmojiStatus />
+                      <div className="info">
+                        <FullNameTitle peer={user} withEmojiStatus />
+                        <span className="status" dir="auto">
+                          <i className="icon icon-heart-outline status-icon" />
+                          {formatDateAtTime(lang, r.addedDate * 1000)}
+                        </span>
+                      </div>
                       {r.reaction && (
                         <ReactionStaticEmoji
                           className="reactors-list-emoji"
@@ -206,6 +220,24 @@ const ReactorListModal: FC<OwnProps & StateProps> = ({
                     </ListItem>,
                   );
                 });
+
+                if (!chosenTab && !userReactions?.length) {
+                  items.push(
+                    <ListItem
+                      key={`${userId}-seen-by`}
+                      className="chat-item-clickable scroll-item small-icon"
+                      // eslint-disable-next-line react/jsx-no-bind
+                      onClick={() => handleClick(userId)}
+                    >
+                      <PrivateChatInfo
+                        userId={userId}
+                        noStatusOrTyping
+                        status={seenByUser ? formatDateAtTime(lang, seenByUser * 1000) : undefined}
+                        statusIcon="icon-message-read"
+                      />
+                    </ListItem>,
+                  );
+                }
                 return items;
               },
             )}
@@ -233,7 +265,7 @@ export default memo(withGlobal<OwnProps>(
       messageId,
       reactions: message?.reactions,
       reactors: message?.reactors,
-      seenByUserIds: message?.seenByUserIds,
+      seenByDates: message?.seenByDates,
       availableReactions: global.availableReactions,
     };
   },
diff --git a/src/components/middle/message/ContextMenuContainer.tsx b/src/components/middle/message/ContextMenuContainer.tsx
index b8d6cdf5d..1d8f7ed46 100644
--- a/src/components/middle/message/ContextMenuContainer.tsx
+++ b/src/components/middle/message/ContextMenuContainer.tsx
@@ -240,14 +240,14 @@ const ContextMenuContainer: FC<OwnProps & StateProps> = ({
       return Array.from(uniqueReactors).filter(Boolean).slice(0, 3);
     }
 
-    if (!message.seenByUserIds) {
+    if (!message.seenByDates) {
       return undefined;
     }
 
     // No need for expensive global updates on users, so we avoid them
     const usersById = getGlobal().users.byId;
-    return message.seenByUserIds?.slice(0, 3).map((id) => usersById[id]).filter(Boolean);
-  }, [message.reactions?.recentReactions, message.seenByUserIds]);
+    return Object.keys(message.seenByDates).slice(0, 3).map((id) => usersById[id]).filter(Boolean);
+  }, [message.reactions?.recentReactions, message.seenByDates]);
 
   const isDownloading = album ? album.messages.some((msg) => activeDownloads.includes(msg.id))
     : activeDownloads.includes(message.id);
diff --git a/src/components/middle/message/MessageContextMenu.tsx b/src/components/middle/message/MessageContextMenu.tsx
index ee4359d90..7edb9d2c4 100644
--- a/src/components/middle/message/MessageContextMenu.tsx
+++ b/src/components/middle/message/MessageContextMenu.tsx
@@ -1,5 +1,5 @@
 import React, {
-  memo, useCallback, useEffect, useRef,
+  memo, useCallback, useEffect, useMemo, useRef,
 } from '../../../lib/teact/teact';
 import { getActions } from '../../../global';
 
@@ -205,10 +205,12 @@ const MessageContextMenu: FC<OwnProps> = ({
   const withReactions = canShowReactionList && !noReactions;
   const isSponsoredMessage = !('id' in message);
   const messageId = !isSponsoredMessage ? message.id : '';
+  const seenByDates = !isSponsoredMessage ? message.seenByDates : undefined;
 
   const [areItemsHidden, hideItems] = useFlag();
   const [isReady, markIsReady, unmarkIsReady] = useFlag();
   const { isMobile, isDesktop } = useAppLayout();
+  const seenByDatesCount = useMemo(() => (seenByDates ? Object.keys(seenByDates).length : 0), [seenByDates]);
 
   const handleAfterCopy = useCallback(() => {
     showNotification({
@@ -384,21 +386,21 @@ const MessageContextMenu: FC<OwnProps> = ({
             className="MessageContextMenu--seen-by"
             icon={canShowReactionsCount ? 'heart-outline' : 'group'}
             onClick={canShowReactionsCount ? onShowReactors : onShowSeenBy}
-            disabled={!canShowReactionsCount && !message.seenByUserIds?.length}
+            disabled={!canShowReactionsCount && !seenByDatesCount}
           >
             <span className="MessageContextMenu--seen-by-label">
               {canShowReactionsCount && message.reactors?.count ? (
-                canShowSeenBy && message.seenByUserIds?.length
+                canShowSeenBy && seenByDatesCount
                   ? lang(
                     'Chat.OutgoingContextMixedReactionCount',
-                    [message.reactors.count, message.seenByUserIds.length],
+                    [message.reactors.count, seenByDatesCount],
                   )
                   : lang('Chat.ContextReactionCount', message.reactors.count, 'i')
               ) : (
-                message.seenByUserIds?.length === 1 && seenByRecentUsers
+                seenByDatesCount === 1 && seenByRecentUsers
                   ? renderText(getUserFullName(seenByRecentUsers[0])!)
-                  : (message.seenByUserIds?.length
-                    ? lang('Conversation.ContextMenuSeen', message.seenByUserIds.length, 'i')
+                  : (seenByDatesCount
+                    ? lang('Conversation.ContextMenuSeen', seenByDatesCount, 'i')
                     : lang('Conversation.ContextMenuNoViews')
                   )
               )}
diff --git a/src/components/ui/ListItem.scss b/src/components/ui/ListItem.scss
index 3a21fd5e8..d4d33c041 100644
--- a/src/components/ui/ListItem.scss
+++ b/src/components/ui/ListItem.scss
@@ -234,6 +234,11 @@
       }
     }
 
+    .status-icon {
+      vertical-align: text-bottom;
+      margin-inline-end: 0.125rem;
+    }
+
     .contact-phone,
     .contact-username {
       font-size: 0.875rem;
diff --git a/src/global/actions/api/messages.ts b/src/global/actions/api/messages.ts
index 9f6a0d92b..11f25b965 100644
--- a/src/global/actions/api/messages.ts
+++ b/src/global/actions/api/messages.ts
@@ -1222,7 +1222,7 @@ addActionHandler('loadSeenBy', async (global, actions, payload): Promise<void> =
 
   global = getGlobal();
   global = updateChatMessage(global, chatId, messageId, {
-    seenByUserIds: result,
+    seenByDates: result,
   });
   setGlobal(global);
 });
diff --git a/src/global/reducers/reactions.ts b/src/global/reducers/reactions.ts
index 6f2d5aa54..cdd169e69 100644
--- a/src/global/reducers/reactions.ts
+++ b/src/global/reducers/reactions.ts
@@ -80,6 +80,7 @@ export function addMessageReaction<T extends GlobalState>(
     recentReactions.unshift({
       userId: currentUserId!,
       reaction,
+      addedDate: Math.floor(Date.now() / 1000),
     });
   });
 
diff --git a/src/util/dateFormat.ts b/src/util/dateFormat.ts
index c984323d5..9b396d5a8 100644
--- a/src/util/dateFormat.ts
+++ b/src/util/dateFormat.ts
@@ -310,6 +310,31 @@ export function formatDateTimeToString(
   );
 }
 
+export function formatDateAtTime(
+  lang: LangFn,
+  datetime: number | Date,
+) {
+  const date = typeof datetime === 'number' ? new Date(datetime) : datetime;
+
+  const today = getDayStart(new Date());
+  const time = formatTime(lang, date);
+
+  if (toIsoString(date) === toIsoString(today)) {
+    return lang('Time.TodayAt', time);
+  }
+
+  const yesterday = new Date(today);
+  yesterday.setDate(today.getDate() - 1);
+  if (toIsoString(date) === toIsoString(yesterday)) {
+    return lang('Time.YesterdayAt', time);
+  }
+
+  const noYear = date.getFullYear() === today.getFullYear();
+  const formattedDate = formatDateToString(date, lang.code, noYear);
+
+  return lang('formatDateAtTime', [formattedDate, time]);
+}
+
 function isValidDate(day: number, month: number, year = 2021): boolean {
   if (month > (MAX_MONTH_IN_YEAR - 1) || day > MAX_DAY_IN_MONTH) {
     return false;