# Yjs

> MIT CRDT library, not a hosted collab product

**Category:** Comms  
**Pricing:** open-source  
**URL:** https://github.com/yjs/yjs  
**GitHub:** https://github.com/yjs/yjs  
**Added:** 2026-09-03

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## The Hook

Yjs is the CRDT you import. There is no Yjs Cloud, no SKU, no watermark.

## What's Good

MIT. Shared types for building collaborative software. Pair with Liveblocks if you want rooms hosted, or bring your own provider. Pair with /skills/yjs-best-practices for the library cookbook — this gem is the Catch, not a duplicate skill page.

## The Catch

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.

## Verdict

The MIT CRDT. Pair with Liveblocks for hosted rooms; this is the library, not the meter.