openimsdk/open-im-server

Health v2 · maintenance only

Adoption not part of the score

16616 stars · 2946 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

OpenIM Server is an open-source instant messaging backend written in Go that powers in-app chat, group messaging, and voice/video calling. It exposes REST Platform APIs and WebSocket connections for multi-platform client SDKs (Web, iOS, Android, Flutter, React Native, Electron) and supports self-hosted deployment.

Use cases

• build an in-app chat feature with 1:1 and group messaging
• self-host a WhatsApp/Telegram-style messaging backend
• add offline messages, history sync, and read receipts to my app
• integrate voice and video calls into a mobile app
• send system notifications to users from my backend via server API
• support large-scale group chats with high concurrency
• embed a chat SDK in a Flutter or React Native app

When to choose

• you need full control over messaging data via self-hosting
• you want an open-source alternative to Twilio, Sendbird, or Firebase Chat
• you need multi-platform SDKs backed by one server
• you require large-group and high-concurrency messaging at scale

When to avoid

• you only need a simple chat UI without backend infrastructure
• you want a fully managed SaaS with zero server maintenance
• your team cannot operate Go services, databases, and message queues
• you need a turnkey end-user chat app rather than developer infrastructure

Facets

service · maturity stable

websocket http-server api-framework message-queue auth sdk messaging-platforms self-hosted backend apis go self-hosted cross-platform instant-messaging chat-server real-time-communication voice-video open-source-im group-chat offline-messages messaging real-time docker web-server

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markdown · JSON · MCP: product_card(name="openimsdk/open-im-server")