diff --git a/src/components/EmojiDisplay.tsx b/src/components/EmojiDisplay.tsx
new file mode 100644
index 0000000..cde7db7
--- /dev/null
+++ b/src/components/EmojiDisplay.tsx
@@ -0,0 +1,29 @@
+import { Component, Match, Switch } from 'solid-js';
+
+import HeartSolid from 'heroicons/24/solid/heart.svg';
+
+import { ReactionTypes } from '@/nostr/event/Reaction';
+
+export type EmojiDisplayProps = {
+  reactionTypes: ReactionTypes;
+};
+
+const isPlus = (r: ReactionTypes) => r.type === 'LikeDislike' && r.content === '+';
+
+const EmojiDisplay: Component<EmojiDisplayProps> = (props) => (
+  <Switch fallback={<span class="truncate">{props.reactionTypes.content}</span>}>
+    <Match when={isPlus(props.reactionTypes)}>
+      <span class="inline-block h-4 w-4 pt-[1px] text-rose-400">
+        <HeartSolid />
+      </span>
+    </Match>
+    <Match when={props.reactionTypes.type === 'Emoji' && props.reactionTypes} keyed>
+      {({ content }) => <span class="truncate">{content}</span>}
+    </Match>
+    <Match when={props.reactionTypes.type === 'CustomEmoji' && props.reactionTypes} keyed>
+      {({ shortcode, url }) => <img class="h-4 max-w-[3rem]" src={url} alt={`:${shortcode}}:`} />}
+    </Match>
+  </Switch>
+);
+
+export default EmojiDisplay;
diff --git a/src/components/event/Reaction.tsx b/src/components/event/Reaction.tsx
index bd47a83..3704336 100644
--- a/src/components/event/Reaction.tsx
+++ b/src/components/event/Reaction.tsx
@@ -1,27 +1,27 @@
-import { Switch, Match, type Component, Show } from 'solid-js';
+import { type Component, Show } from 'solid-js';
 
-import HeartSolid from 'heroicons/24/solid/heart.svg';
 import { type Event as NostrEvent } from 'nostr-tools';
 
+import EmojiDisplay from '@/components/EmojiDisplay';
 import TextNoteDisplay from '@/components/event/textNote/TextNoteDisplay';
 import UserDisplayName from '@/components/UserDisplayName';
 import useConfig from '@/core/useConfig';
 import useModalState from '@/hooks/useModalState';
 import { useTranslation } from '@/i18n/useTranslation';
-import { genericEvent } from '@/nostr/event';
+import { reaction } from '@/nostr/event';
 import useEvent from '@/nostr/useEvent';
 import useProfile from '@/nostr/useProfile';
 import ensureNonNull from '@/utils/ensureNonNull';
 
-type ReactionProps = {
+type ReactionDisplayProps = {
   event: NostrEvent;
 };
 
-const Reaction: Component<ReactionProps> = (props) => {
+const ReactionDisplay: Component<ReactionDisplayProps> = (props) => {
   const i18n = useTranslation();
   const { shouldMuteEvent } = useConfig();
   const { showProfile } = useModalState();
-  const event = () => genericEvent(props.event);
+  const event = () => reaction(props.event);
   const eventId = () => event().lastTaggedEventId();
 
   const { profile } = useProfile(() => ({
@@ -41,13 +41,7 @@ const Reaction: Component<ReactionProps> = (props) => {
     <Show when={!isRemoved() || shouldMuteEvent(props.event)}>
       <div class="flex gap-1 px-1 text-sm">
         <div class="notification-icon flex max-w-[64px] place-items-center">
-          <Switch fallback={<span class="truncate">{props.event.content}</span>}>
-            <Match when={props.event.content === '+'}>
-              <span class="h-4 w-4 pt-[1px] text-rose-400">
-                <HeartSolid />
-              </span>
-            </Match>
-          </Switch>
+          <EmojiDisplay reactionTypes={event().toReactionTypes()} />
         </div>
         <div class="notification-user flex gap-1 overflow-hidden">
           <div class="author-icon h-5 w-5 shrink-0 overflow-hidden object-cover">
@@ -84,4 +78,4 @@ const Reaction: Component<ReactionProps> = (props) => {
   );
 };
 
-export default Reaction;
+export default ReactionDisplay;
diff --git a/src/components/event/textNote/TextNoteDisplay.tsx b/src/components/event/textNote/TextNoteDisplay.tsx
index 2565445..af84cbb 100644
--- a/src/components/event/textNote/TextNoteDisplay.tsx
+++ b/src/components/event/textNote/TextNoteDisplay.tsx
@@ -19,6 +19,7 @@ import HeartSolid from 'heroicons/24/solid/heart.svg';
 import { nip19, type Event as NostrEvent } from 'nostr-tools';
 
 import ContextMenu, { MenuItem } from '@/components/ContextMenu';
+import EmojiDisplay from '@/components/EmojiDisplay';
 import EmojiPicker from '@/components/EmojiPicker';
 // eslint-disable-next-line import/no-cycle
 import EventDisplayById from '@/components/event/EventDisplayById';
@@ -33,7 +34,8 @@ import { useTimelineContext } from '@/components/timeline/TimelineContext';
 import useConfig from '@/core/useConfig';
 import useModalState from '@/hooks/useModalState';
 import { useTranslation } from '@/i18n/useTranslation';
-import { textNote } from '@/nostr/event';
+import { textNote, reaction } from '@/nostr/event';
+import { ReactionTypes } from '@/nostr/event/Reaction';
 import useCommands from '@/nostr/useCommands';
 import usePubkey from '@/nostr/usePubkey';
 import useReactions from '@/nostr/useReactions';
@@ -48,8 +50,8 @@ export type TextNoteDisplayProps = {
 };
 
 type EmojiReactionsProps = {
-  reactionsGroupedByContent: Map<string, NostrEvent[]>;
-  onReaction: (emoji: string) => void;
+  reactionsGrouped: Map<string, NostrEvent[]>;
+  onReaction: (reaction: ReactionTypes) => void;
 };
 
 const { noteEncode } = nip19;
@@ -60,10 +62,11 @@ const EmojiReactions: Component<EmojiReactionsProps> = (props) => {
 
   return (
     <div class="flex gap-2 overflow-x-auto py-1">
-      <For each={[...props.reactionsGroupedByContent.entries()]}>
-        {([content, events]) => {
+      <For each={[...props.reactionsGrouped.entries()]}>
+        {([, events]) => {
           const isReactedByMeWithThisContent =
             events.findIndex((ev) => ev.pubkey === pubkey()) >= 0;
+          const reactionTypes = reaction(events[0]).toReactionTypes();
 
           return (
             <button
@@ -76,16 +79,9 @@ const EmojiReactions: Component<EmojiReactionsProps> = (props) => {
                 'text-rose-400': isReactedByMeWithThisContent,
               }}
               type="button"
-              onClick={() => props.onReaction(content)}
+              onClick={() => props.onReaction(reactionTypes)}
             >
-              <Show
-                when={content === '+'}
-                fallback={<span class="truncate text-base">{content}</span>}
-              >
-                <span class="inline-block h-3 w-3 pt-[1px] text-rose-400">
-                  <HeartSolid />
-                </span>
-              </Show>
+              <EmojiDisplay reactionTypes={reactionTypes} />
               <Show when={!config().hideCount}>
                 <span class="ml-1 text-sm">{events.length}</span>
               </Show>
@@ -119,7 +115,7 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
 
   const {
     reactions,
-    reactionsGroupedByContent,
+    reactionsGrouped,
     isReactedBy,
     isReactedByWithEmoji,
     invalidateReactions,
@@ -289,7 +285,7 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
     });
   };
 
-  const doReaction = (emoji?: string) => {
+  const doReaction = (reactionTypes?: ReactionTypes) => {
     if (isReactedByMe()) {
       // TODO remove reaction
       return;
@@ -299,7 +295,7 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
       publishReactionMutation.mutate({
         relayUrls: config().relayUrls,
         pubkey: pubkeyNonNull,
-        content: emoji ?? '+',
+        reactionTypes: reactionTypes ?? { type: 'LikeDislike', content: '+' },
         eventId: eventIdNonNull,
         notifyPubkey: props.event.pubkey,
       });
@@ -355,10 +351,7 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
         actions={
           <Show when={actions()}>
             <Show when={config().showEmojiReaction && reactions().length > 0}>
-              <EmojiReactions
-                reactionsGroupedByContent={reactionsGroupedByContent()}
-                onReaction={doReaction}
-              />
+              <EmojiReactions reactionsGrouped={reactionsGrouped()} onReaction={doReaction} />
             </Show>
             <div class="actions flex w-52 items-center justify-between gap-8 pt-1">
               <button
@@ -430,7 +423,9 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
                       publishReactionMutation.isLoading,
                   }}
                 >
-                  <EmojiPicker onEmojiSelect={(emoji) => doReaction(emoji)}>
+                  <EmojiPicker
+                    onEmojiSelect={(emoji) => doReaction({ type: 'Emoji', content: emoji })}
+                  >
                     <span class="inline-block h-4 w-4">
                       <Plus />
                     </span>
@@ -472,16 +467,9 @@ const TextNoteDisplay: Component<TextNoteDisplayProps> = (props) => {
           <UserList
             data={reactions()}
             pubkeyExtractor={(ev) => ev.pubkey}
-            renderInfo={({ content }) => (
+            renderInfo={(ev) => (
               <div class="w-6">
-                <Show
-                  when={content === '+'}
-                  fallback={<span class="truncate text-base">{content}</span>}
-                >
-                  <span class="inline-block h-3 w-3 pt-[1px] text-rose-400">
-                    <HeartSolid />
-                  </span>
-                </Show>
+                <EmojiDisplay reactionTypes={reaction(ev).toReactionTypes()} />
               </div>
             )}
             onClose={closeModal}
diff --git a/src/nostr/event.ts b/src/nostr/event.ts
index 4a27468..e3a529a 100644
--- a/src/nostr/event.ts
+++ b/src/nostr/event.ts
@@ -1,8 +1,11 @@
 import { Kind, Event as NostrEvent } from 'nostr-tools';
 
 import GenericEvent from '@/nostr/event/GenericEvent';
+import Reaction from '@/nostr/event/Reaction';
 import TextNote from '@/nostr/event/TextNote';
 
 export const genericEvent = (event: NostrEvent): GenericEvent => new GenericEvent(event);
 
 export const textNote = (event: NostrEvent): TextNote => new TextNote(event);
+
+export const reaction = (event: NostrEvent): Reaction => new Reaction(event);
diff --git a/src/nostr/event/Reaction.ts b/src/nostr/event/Reaction.ts
new file mode 100644
index 0000000..6b3315e
--- /dev/null
+++ b/src/nostr/event/Reaction.ts
@@ -0,0 +1,74 @@
+import { Event as NostrEvent, Kind } from 'nostr-tools';
+
+import GenericEvent from '@/nostr/event/GenericEvent';
+
+const emojiRegex = /^\p{Emoji}[\p{Emoji_Component}\p{Emoji_Modifier}\p{Emoji_Presentation}]*$/u;
+const customEmojiRegex = /^:(\w+):$/;
+
+export type ReactionTypes =
+  | { type: 'Emoji'; content: string }
+  | { type: 'CustomEmoji'; content: string; shortcode: string; url: string }
+  | { type: 'LikeDislike'; content: string }
+  | { type: 'Unknown'; content: string };
+
+const reactionToReactionTypes = (event: Reaction): ReactionTypes => {
+  if (event.isLikeOrDislike()) {
+    return { type: 'LikeDislike', content: event.content };
+  }
+  if (event.isEmoji()) {
+    return { type: 'Emoji', content: event.content };
+  }
+  if (event.isCustomEmoji()) {
+    const shortcode = event.getShortcode();
+    const url = event.getUrl();
+    if (shortcode != null && url != null) {
+      return { type: 'CustomEmoji', content: event.content, shortcode, url };
+    }
+  }
+  return { type: 'Unknown', content: event.content };
+};
+
+export default class Reaction extends GenericEvent {
+  constructor(rawEvent: NostrEvent) {
+    if (rawEvent.kind !== Kind.Reaction) {
+      throw new TypeError('kind should be 7');
+    }
+    super(rawEvent);
+  }
+
+  isLike(): boolean {
+    return this.content === '+';
+  }
+
+  isDislike(): boolean {
+    return this.content === '-';
+  }
+
+  isLikeOrDislike(): boolean {
+    return this.isLike() || this.isDislike();
+  }
+
+  isEmoji(): boolean {
+    return emojiRegex.test(this.content);
+  }
+
+  isCustomEmoji(): boolean {
+    return customEmojiRegex.test(this.content);
+  }
+
+  getShortcode(): string | undefined {
+    const match = this.content.match(customEmojiRegex);
+    const shortcode = match?.[1];
+    return shortcode;
+  }
+
+  getUrl(): string | undefined {
+    const shortcode = this.getShortcode();
+    if (shortcode == null) return undefined;
+    return this.getEmojiUrl(shortcode);
+  }
+
+  toReactionTypes(): ReactionTypes {
+    return reactionToReactionTypes(this);
+  }
+}
diff --git a/src/nostr/event/Tags.ts b/src/nostr/event/Tags.ts
index 65a16cb..f93e09f 100644
--- a/src/nostr/event/Tags.ts
+++ b/src/nostr/event/Tags.ts
@@ -2,7 +2,7 @@ import { z } from 'zod';
 
 import TagsBase from '@/nostr/event/TagsBase';
 
-const TagsSchema = z.array(z.array(z.string()));
+export const TagsSchema = z.array(z.array(z.string()));
 
 export default class Tags extends TagsBase {
   constructor(readonly tags: string[][]) {
diff --git a/src/nostr/event/TagsBase.ts b/src/nostr/event/TagsBase.ts
index 3dcc6de..d959d40 100644
--- a/src/nostr/event/TagsBase.ts
+++ b/src/nostr/event/TagsBase.ts
@@ -1,6 +1,18 @@
 import uniq from 'lodash/uniq';
+import { z } from 'zod';
 
 import isValidId from '@/nostr/event/isValidId';
+import ensureSchema from '@/utils/ensureSchema';
+
+export const EmojiTagSchema = z.tuple([
+  z.literal('emoji'),
+  z.string().regex(/^\w+$/, {
+    message: 'shortcode can includes only alpahnumeric characters and underscore',
+  }),
+  z.string().url(), // .refine(isImageUrl)
+]);
+
+export type EmojiTag = z.infer<typeof EmojiTagSchema>;
 
 export default abstract class TagsBase {
   abstract get tags(): string[][];
@@ -25,6 +37,10 @@ export default abstract class TagsBase {
     return this.tags.filter(([tagName, eventId]) => tagName === 'e' && isValidId(eventId));
   }
 
+  emojiTags(): EmojiTag[] {
+    return this.tags.filter(ensureSchema(EmojiTagSchema));
+  }
+
   taggedPubkeys(): string[] {
     return uniq(this.pTags().map(([, pubkey]) => pubkey));
   }
@@ -39,4 +55,12 @@ export default abstract class TagsBase {
     if (ids.length === 0) return undefined;
     return ids[ids.length - 1];
   }
+
+  // TODO move to some abstract class
+  getEmojiUrl(shortcode: string): string | undefined {
+    const emojiTag = this.emojiTags().find(([, code]) => code === shortcode);
+    if (emojiTag == null) return undefined;
+    const [, , url] = emojiTag;
+    return url;
+  }
 }
diff --git a/src/nostr/event/TextNote.ts b/src/nostr/event/TextNote.ts
index 491c1cb..95f0b90 100644
--- a/src/nostr/event/TextNote.ts
+++ b/src/nostr/event/TextNote.ts
@@ -32,16 +32,6 @@ export type ContentWarning = {
   reason?: string;
 };
 
-const EmojiTagSchema = z.tuple([
-  z.literal('emoji'),
-  z.string().regex(/^\w+$/, {
-    message: 'shortcode can includes only alpahnumeric characters and underscore',
-  }),
-  z.string().url(), // .refine(isImageUrl)
-]);
-
-export type EmojiTag = z.infer<typeof EmojiTagSchema>;
-
 export const markedEventTags = (tags: string[][]): MarkedEventTag[] => {
   // 'eTags' cannot be used here because it does not preserve originalIndex.
   const events = tags
@@ -184,15 +174,4 @@ export default class TextNote extends GenericEvent {
           (node.data.type === 'note' && node.data.data === eventId)),
     );
   }
-
-  emojiTags(): EmojiTag[] {
-    return this.rawEvent.tags.filter(ensureSchema(EmojiTagSchema));
-  }
-
-  getEmojiUrl(shortcode: string): string | null {
-    const emojiTag = this.emojiTags().find(([, code]) => code === shortcode);
-    if (emojiTag == null) return null;
-    const [, , url] = emojiTag;
-    return url;
-  }
 }
diff --git a/src/nostr/useCommands.ts b/src/nostr/useCommands.ts
index b3d7eb3..4c794da 100644
--- a/src/nostr/useCommands.ts
+++ b/src/nostr/useCommands.ts
@@ -2,6 +2,7 @@ import { getEventHash, Kind, type UnsignedEvent, type Pub } from 'nostr-tools';
 
 // import '@/types/nostr.d';
 import { ProfileWithOtherProperties, Profile } from '@/nostr/event/Profile';
+import { ReactionTypes } from '@/nostr/event/Reaction';
 import usePool from '@/nostr/usePool';
 import epoch from '@/utils/epoch';
 
@@ -126,25 +127,30 @@ const useCommands = () => {
     relayUrls,
     pubkey,
     eventId,
-    content,
+    reactionTypes,
     notifyPubkey,
   }: {
     relayUrls: string[];
     pubkey: string;
     eventId: string;
-    content: string;
+    reactionTypes: ReactionTypes;
     notifyPubkey: string;
   }): Promise<Promise<void>[]> => {
-    // TODO ensure that content is + or - or emoji.
+    const tags = [
+      ['e', eventId, ''],
+      ['p', notifyPubkey],
+    ];
+
+    if (reactionTypes.type === 'CustomEmoji') {
+      tags.push(['emoji', reactionTypes.shortcode, reactionTypes.url]);
+    }
+
     const preSignedEvent: UnsignedEvent = {
       kind: 7,
       pubkey,
       created_at: epoch(),
-      tags: [
-        ['e', eventId, ''],
-        ['p', notifyPubkey],
-      ],
-      content,
+      tags,
+      content: reactionTypes.content,
     };
     return publishEvent(relayUrls, preSignedEvent);
   };
diff --git a/src/nostr/useReactions.ts b/src/nostr/useReactions.ts
index f8c1369..aa0fa11 100644
--- a/src/nostr/useReactions.ts
+++ b/src/nostr/useReactions.ts
@@ -4,6 +4,7 @@ import { createQuery, useQueryClient, type CreateQueryResult } from '@tanstack/s
 import { Event as NostrEvent } from 'nostr-tools';
 
 import useConfig from '@/core/useConfig';
+import { reaction } from '@/nostr/event';
 import { eventsQuery } from '@/nostr/query';
 import { BatchedEventsTask } from '@/nostr/useBatchedEvents';
 
@@ -13,7 +14,7 @@ export type UseReactionsProps = {
 
 export type UseReactions = {
   reactions: () => NostrEvent[];
-  reactionsGroupedByContent: () => Map<string, NostrEvent[]>;
+  reactionsGrouped: () => Map<string, NostrEvent[]>;
   isReactedBy: (pubkey: string) => boolean;
   isReactedByWithEmoji: (pubkey: string) => boolean;
   invalidateReactions: () => Promise<void>;
@@ -50,12 +51,15 @@ const useReactions = (propsProvider: () => UseReactionsProps | null): UseReactio
     return data.filter((ev) => !shouldMuteEvent(ev));
   };
 
-  const reactionsGroupedByContent = () => {
+  const reactionsGrouped = () => {
     const result = new Map<string, NostrEvent[]>();
     reactions().forEach((event) => {
-      const events = result.get(event.content) ?? [];
+      const key = reaction(event).isCustomEmoji()
+        ? `${event.content}${reaction(event).getUrl() ?? ''}`
+        : event.content;
+      const events = result.get(key) ?? [];
       events.push(event);
-      result.set(event.content, events);
+      result.set(key, events);
     });
     return result;
   };
@@ -71,7 +75,7 @@ const useReactions = (propsProvider: () => UseReactionsProps | null): UseReactio
 
   return {
     reactions,
-    reactionsGroupedByContent,
+    reactionsGrouped,
     isReactedBy,
     isReactedByWithEmoji,
     invalidateReactions,