Yjs

CRDT for collaborative editing

FreeRealtime, comments & collabyjs.dev

What it is

CRDT implementation exposing shared types — Map, Array, Text and XML — that merge concurrent edits without conflicts or a central authority. Network-agnostic, with providers including y-websocket, y-webrtc and Hocuspocus, and persistence via IndexedDB or Postgres. Bindings exist for ProseMirror, Tiptap, Lexical, Slate, CodeMirror, Monaco and Quill.

Why it earns a slot

The de facto standard for multiplayer text. Pair it with Tiptap or Lexical and two editors merge cleanly with live cursors and offline edits included — and nearly every commercial collaboration vendor is really selling you hosted Yjs.

Know before you commit

Yjs is only the data structure; you still supply the websocket server, auth and persistence, which is where the real engineering sits. Documents grow with accumulated edit history unless you snapshot, and there is no built-in permissions model.

Getting started

npm i yjs y-websocket

Field notes

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Pricing snapshot

Free and MIT licensed. Transport and persistence are your choice: self-host y-websocket or Hocuspocus for nothing, or buy hosting from Liveblocks, y-sweet or Hocuspocus Cloud

Snapshots move fast — verify at checkout, and post a field note if it changed.

Drop into your Lovable chat

Evaluate Yjs (https://yjs.dev) for this project, then use it only if it fits what we are already building.
Context: CRDT for collaborative editing. CRDT implementation exposing shared types — Map, Array, Text and XML — that merge concurrent edits without conflicts or a central authority. Network-agnostic, with providers including y-websocket, y-webrtc and Hocuspocus, and persistence via IndexedDB or Postgres. Bindings exist for ProseMirror, Tiptap, Lexical, Slate, CodeMirror, Monaco and Quill.
Reviewer notes (general, not written for this codebase): The de facto standard for multiplayer text. Pair it with Tiptap or Lexical and two editors merge cleanly with live cursors and offline edits included — and nearly every commercial collaboration vendor is really selling you hosted Yjs.
Watch out for: Yjs is only the data structure; you still supply the websocket server, auth and persistence, which is where the real engineering sits. Documents grow with accumulated edit history unless you snapshot, and there is no built-in permissions model.
Pricing: Free and MIT licensed. Transport and persistence are your choice: self-host y-websocket or Hocuspocus for nothing, or buy hosting from Liveblocks, y-sweet or Hocuspocus Cloud
Setup: npm i yjs y-websocket
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

/api/public/tools/yjs

Neighbourhood

How Yjs sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.

Instead of thisGiscus PartyKit Socket.IO Ably Agora Chatwoot Circle Crisp Cusdis

Named in the wiringCursor

Also in Realtime, comments & collab

Ably

ably.com

Realtime messaging platform

Free tier + paidRealtime, comments & collab

Free: 6M messages/mo, 200 concurrent connections, 200 channels, 500 msg/sec. Standard $29/mo plus usage (10k connections, 10k channels); Pro $399/mo plus usage (50k). Usage: $2.50 per million messages, $1.00 per million connection-minutes, $0.25/GiB transfer

Open dossier

Agora

agora.io

Metered RTC voice and video API

Free tier + paidRealtime, comments & collab

Free monthly: 10,000 combined RTC minutes, 1M signaling messages, 500 chat users, 300 conversational AI minutes. RTC $0.59 per 1,000 minutes; recording $0.99 per 1,000; speech-to-text $16.99 per 1,000; real-time translation $8.99 per 1,000 per language. Analytics add-on from $449/mo

Open dossier

Chatwoot

chatwoot.com

Open-source support inbox + chat

Free tier + paidRealtime, comments & collab

Self-host free under the MIT licence. Cloud Hacker $0 (2 agents, 500 conversations/mo, live chat only, 30-day retention); Startups $19/agent/mo annual; Business $39/agent/mo; Enterprise $99/agent/mo. Extra Captain AI credits $20 per 1,000

Open dossier

Circle

circle.so

Hosted community and courses

PaidRealtime, comments & collab

Professional $89/mo (3 admin seats, 2% transaction fee, 200 GB); Business $199/mo (5 seats, 1% fee, 500 GB); Circle Plus custom (unlimited seats, 0.5% fee, 1 TB). Unlimited members on every plan. 14-day trial, no permanent free plan

Open dossier