Overlap
Realtime for Browser
Realtime tools that run on Browser. The Catch for each, not a winner list.
6 tools · the Catch, not a ranking
- Socket.IOMIT realtime library with fallbacks, not a hosted product
You bring the host. Horizontal scale needs Redis (or equivalent) adapter. This is not LiveKit and not a managed pub-sub. CORS, sticky sessions, and polling surprises remain your bugs.
- LiveblocksHosted collab rooms; Free $0 pauses at the cap
Free pauses at the cap until the next cycle — not PAYG. Pro is $30/mo (credits + drop branding). Self-host is an Enterprise add-on, not the OSS path. Distinct from Socket.IO (you run the server) and Centrifugo (Go binary you operate).
- YjsMIT CRDT library, not a hosted collab product
Not a product. No hosted SKU, no pricing page, no support SLA. You bring the network layer (Liveblocks, y-websocket, your own). Distinct from Socket.IO: CRDT merge, not event fan-out.
- PeerJSMIT browser P2P WebRTC with free cloud or self-host signaling
Browser P2P WebRTC + optional free signaling — not LiveKit/mediasoup media-server rooms. Larger groups need a media server (SFU-class), not PeerJS alone. Distinct from LiveKit and mediasoup.
- matrix-js-sdkApache-2.0 Matrix client library — needs a homeserver
Client lib only — you need a homeserver (Tuwunel etc.). Not a homeserver and not a generic WS product. Distinct from Tuwunel.
- PartyKitMIT realtime rooms on Cloudflare Durable Objects; pay CF Workers only
Vs Liveblocks/Yjs+Hocuspocus: room primitive on CF, not prebuilt comments/inbox SaaS. You pay Cloudflare Workers/DO usage at scale. Auth, persistence, and CRDT choice are yours. Post-acquisition roadmap rides CF.