Free Chat SDK (IM SDK) — 1,000 MAU/month free forever with push notifications & no concurrency limits. Build in-app messaging with chat API, UIKit & send message. Supports Android, iOS, Flutter, Web, React Native, uni-app, HarmonyOS & more.

💬 Android Chat SDK ➜ Stream Chat API. UI component libraries for chat apps. Kotlin & Jetpack Compose messaging SDK for Android chat

Chat SDK Android - Open Source Mobile Messenger

💬 React-Native Chat SDK ➜ Stream Chat. Includes a tutorial on building your own chat app experience using React-Native, React-Navigation and Stream

Flutter Chat SDK - Build your own chat app experience using Dart, Flutter and the Stream Chat Messaging API.

💬 iOS Chat SDK in Swift - Build your own app chat experience for iOS using the official Stream Chat API

Chat SDK iOS - Open Source Mobile Messenger

React Chat SDK ➜ Stream Chat 💬

SDK monorepo for Ethora chat / messaging platform. (1) Pick an SDK for your frontend stack. (2) Integrate manually or using ethora-setup. (3) Optionally configure app settings, deploy AI agents etc. Server: ethora.com cloud [free]. Dedicated server + SLA option for enterprise customers.

SwiftUI Chat SDK ➜ Stream Chat 💬

Tinode chat client application for Android

Build chat in minutes with Sendbird UIKit open source code.

Free Chat UIKit for React — 1,000 MAU/month free forever with push notifications & no concurrency limits. Build in-app chat UI in minutes with pre-built Vue components: conversation list, large community, contact, group management.

JS / Browser Client - Build Chat with GetStream.io

A plug and play modular toolkit for integrating the Chat feature on top of Firebase!

TalkJS (https://talkjs.com) examples

Sendbird UIKit for iOS is a development kit with a user interface, offering a simplified integration into chat.

A Flutter Chat application, for android, ios and web platform, using Firebase for Google Sign In/Sign Up and exchange text, emoji and images, include user online feature

Build chat in minutes with Sendbird UIKit open source code.

Free Chat UIKit for React — 1,000 MAU/month free forever with push notifications & no concurrency limits. Build in-app chat UI in minutes with pre-built React components: conversation list, large community, contact, group management.