Feature Guide

How to build
Real-Time Collaboration

Live cursors, simultaneous editing, presence indicators, and conflict resolution for multi-user apps.

advanced
4–8 weeks (manual)
1–3 weeks (with AI)

Best tools to use

[01]

Liveblocks

Drop-in real-time collaboration. Presence, storage, and comments out of the box.

[02]

Yjs

Open-source CRDT framework. Powers many collaborative editors.

[03]

PartyKit

Edge-first real-time infrastructure on Cloudflare Workers.

[04]

Supabase Realtime

PostgreSQL changes broadcast via WebSockets. Good for simpler use cases.

[05]

Socket.io

Battle-tested WebSocket library. More manual but full control.

Key considerations

  • ✓Choose between OT (Operational Transform) and CRDT based on your use case
  • ✓CRDTs (Yjs) are better for offline-first and P2P scenarios
  • ✓Implement presence (who's online, cursor positions) — users expect it
  • ✓Plan for conflict resolution strategy before building
  • ✓Consider using Liveblocks if you want to ship fast without deep real-time expertise

Common mistakes

  • ✗Building real-time from scratch with raw WebSockets
  • ✗Not handling reconnection and offline states
  • ✗Ignoring conflict resolution — last-write-wins causes data loss
  • ✗No presence indicators — users don't know others are editing
  • ✗Scaling WebSocket connections without a proper pub/sub layer

Products that nailed this

Notion
Figma
Google Docs
Linear

Related features

rich text editorfile storageteam management

Skip the research.

SassCloner generates implementation specs for real-time collaboration — including database schema, API routes, and UI components. Paste into Cursor and start building.

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