Real-time
5 open source tools compared. Sorted by stars — scroll down for our analysis.
| Tool | Stars | Velocity | Language | License | Score |
|---|---|---|---|---|---|
 Socket.IO Real-time bidirectional event-based communication | 63.0k | — | TypeScript | MIT License | 82 |
 LiveKit Open source WebRTC infrastructure | 17.8k | +137/wk | Go | Apache License 2.0 | 79 |
| 7.0k | — | Java | — | 57 | |
| 2.4k | — | TypeScript | — | 51 | |
| 669 | — | Java | — | 43 |
Our Analysis
Socket.IO is the default answer when someone asks "how do I add real-time to my app." It wraps WebSockets with automatic fallbacks, reconnection logic, and room-based broadcasting. Thirteen years in, it still works and still ships. For chat apps, live dashboards, collaborative editors, or multiplayer games — Socket.IO gets you there fast. The API is dead simple: emit an event on one side, listen on the other. ws is lighter if you only need raw WebSockets. Ably and Pusher handle the infrastructure for you but charge per message. If you're already on Supabase, its Realtime channels might be enough. Best for indie hackers who need real-time features without managing WebSocket infrastructure. The ecosystem is massive — adapters for Redis, Postgres, MongoDB for horizontal scaling. The catch: Socket.IO adds overhead compared to raw WebSockets. At serious scale (100k+ connections), you'll feel it. The protocol isn't standard WebSocket, so non-JS clients need special libraries. And if you're building something latency-critical like a trading platform, go lower-level.
LiveKit is open-source WebRTC infrastructure that turns "build a video call feature" from a six-month project into a weekend. Real-time audio, video, screen sharing, and — this is the 2026 differentiator — a full AI agent framework that lets voice bots join rooms as participants. Think AI customer support that actually sounds like a conversation. If you're building anything real-time — telehealth, live classes, AI voice agents — LiveKit gives you the infrastructure without Twilio's per-minute pricing or Agora's vendor lock-in. 100ms offers prebuilt UI kits for faster shipping. Twilio and Agora are the managed alternatives if you want zero infrastructure responsibility. The catch: self-hosting WebRTC at scale is genuinely hard. TURN servers, network traversal, bandwidth costs — LiveKit makes the code easy, but the infrastructure still needs expertise. Their cloud offering exists but pricing isn't transparent. And the AI agent framework, while impressive, is still early — expect breaking changes.