FluidFramework

Socket.IO

socketio/socket.io

Popular

Bidirectional real-time events over WebSocket with fallbacks, rooms and auto-reconnect.

Yjs

yjs/yjs

Popular

High-performance CRDT for collaborative editing, with bindings for Tiptap, Lexical, CodeMirror and more.

Liveblocks

liveblocks/liveblocks

Hosted APIs and React components for multiplayer presence, comments, notifications and collaborative editing.

PartyKit

partykit/partykit

Framework for stateful real-time servers on Cloudflare Durable Objects, with the partysocket client.

Pusher Channels

pusher/pusher-js

Hosted pub/sub WebSocket service with simple client SDKs for live updates and notifications.

Ably

ably/ably-pubsub-js

Hosted real-time messaging platform with guaranteed ordering, presence and history.

Zero

rocicorp/mono

Trending (detected automatically)Rising

Sync engine from Rocicorp that gives instant, query-driven local-first UIs on top of Postgres.

ElectricSQL

electric-sql/electric

Trending (detected automatically)Rising

Postgres sync engine that streams partial data ('shapes') into local apps; pairs with TanStack DB.

Automerge

automerge/automerge

JSON-like CRDT library (Rust core, JS bindings) for local-first apps with automatic merging.