Chat & Messaging
Use OpenIM to add 1:1 chat, groups, large-scale groups, and rich messaging to your app.
Use multi-platform SDKs, Server APIs, webhooks, and self-hosted deployment.
Chat features
Cover the core interactions users expect, from replies and read status to offline sync.
Chat feature matrix
Covers messages, conversations, Friends & Contacts, groups, Server APIs, and webhooks.
Advanced messaging
Add message status, search context, translation, and conversation management on top of core chat.
See which group members have read a message.
Automatically clear messages after they are read.
Edit sent messages and show sending, delivered, and read states.
View surrounding conversation context when searching messages.
Use speech-to-text and translation to understand messages.
Organize many conversations with labels and groups.
Developer integration
Use SDKs, Server APIs, and webhooks to connect messages, conversations, groups, and users to your app and backend.
01import { getSDK } from '@openim/wasm-client-sdk';
02
03const OpenIM = getSDK();
04const { data: message } =
05 await OpenIM.createTextMessage('Hello OpenIM!');
06
07await OpenIM.sendMessage({
08 recvID: 'targetUserID',
09 groupID: '',
10 message,
11});01OIMInitConfig *config = [OIMInitConfig new];
02config.apiAddr = apiAddr;
03config.wsAddr = wsAddr;
04[OIMManager.manager initSDKWithConfig:config];
05
06[OIMManager.manager login:userID
07 token:token
08 onSuccess:^(NSString *data) {
09 } onFailure:^(NSInteger code, NSString *msg) {
10 }];01OpenIMClient.getInstance().initSDK(
02 context,
03 initConfig,
04 sdkListener
05);
06
07OpenIMClient.getInstance().login(
08 callback,
09 userID,
10 imToken
11);01import 'package:flutter_openim_sdk/flutter_openim_sdk.dart';
02
03await OpenIM.iMManager.initSDK(
04 apiAddr: apiAddr,
05 wsAddr: wsAddr,
06);
07
08final userInfo = await OpenIM.iMManager.login(
09 userID: userID,
10 token: token,
11);01POST /msg/send_msg HTTP/1.1
02operationID: 1646445464564
03token: <admin-token>
04Content-Type: application/json
05
06{
07 "sendID": "openIMAdmin",
08 "recvID": "user_1001",
09 "content": {
10 "content": "Hello OpenIM"
11 },
12 "contentType": 101,
13 "sessionType": 1
14}Choose a path
Choose the build path that fits your product stage.
Add messages, conversations, groups, and friends to your custom chat UI.
Use sample clients to learn IMSDK integration, conversations, and messaging flows.
Use production-ready client apps to move faster toward launch.
Reliability & scale
Support offline messages, history sync, multi-device sync, reconnects, and cluster deployment for large group scenarios.
Other products
Add voice calls, video calls, group voice & video, and video meetings on top of chat.
Explore Voice & VideoStart building
Use OpenIM to add messages, conversations, groups, and chat to your app.
FAQ
IMSDK mainly provides messaging, conversations, groups, and friends. It does not include a full chat UI; start with the open-source demo or explore production-ready client apps.
OpenIM supports text, images, voice, video, files, locations, contact cards, custom messages, and system notifications.
OpenIM supports offline messages, message history sync, and multi-device sync so users can continue conversations after returning or switching devices.
Yes. OpenIM supports groups with up to 100K members, with member permissions, muting, group profile sync, and group chat history search.
Your backend can manage users, friends, groups, conversations, and messages with Server APIs, then listen for message, push, friend, and user events through webhooks.
