Liveblocks
APIs for adding real-time multiplayer collaboration and AI copilot features to web apps - 10,000+ developers use it to build Figma-style collaboration without backend work.
Liveblocks is a set of developer APIs and pre-built UI components that allow product teams to add real-time multiplayer collaboration and AI copilot features to web applications without building the underlying WebSocket, conflict resolution, or persistence infrastructure from scratch. Founded in 2021 by Guillaume Salles in Amsterdam, the company raised $30 million and counts 10,000+ developers using its platform to build collaborative features in tools across design, writing, data, and productivity. Liveblocks provides four core products: Presence (live cursors, avatars, online indicators), Storage (synchronized shared state with conflict resolution), Comments (threaded discussion on any content), and Notifications (in-app and email alerts for collaboration events). The Liveblocks AI extension enables teams to embed AI text generation, suggestion, and command interfaces directly into collaborative documents and editors - building Notion AI-style copilot features on top of the same real-time infrastructure without managing separate AI and collaboration backends.
Key Features
- Presence API provides live cursors, user avatars, and online indicators that sync across all connected clients in real time via WebSocket
- Storage API synchronizes shared application state with automatic conflict resolution using CRDT data structures - no merge conflicts to handle manually
- Comments API adds threaded discussion, @mentions, and emoji reactions to any content without building comment storage or notification infrastructure
- Liveblocks AI embeds text generation, slash commands, and inline copilot suggestions into collaborative editors using the same real-time infrastructure
- Notifications API delivers in-app and email alerts for mentions, replies, and collaboration events with read-state synchronization across sessions
- Pre-built React and JavaScript components for text editors (Tiptap, BlockNote, Lexical) wire collaboration and AI features into existing editor setups
- REST and webhooks API exposes room state, user lists, and comment data for building custom server-side collaboration workflows and audit trails
Use Cases
- SaaS products adding Figma-style multiplayer cursors and presence indicators to their existing canvas or document editor without WebSocket engineering
- Writing and note-taking tools adding Notion AI-style inline copilot suggestions inside collaborative documents using Liveblocks AI and Storage together
- Design tools embedding threaded comment threads on specific canvas elements without building comment storage, notification, or threading infrastructure
- Data teams adding real-time collaborative editing to dashboards and reports so multiple analysts can work in the same session without version conflicts
Pros
- Managed WebSocket infrastructure, CRDT conflict resolution, and persistence eliminate the hardest parts of real-time collaboration from the engineering scope
- Liveblocks AI combines collaboration and AI copilot features on the same backend - teams don't wire together separate real-time and AI infrastructure services
- Free tier with 50 monthly active users is sufficient for evaluating and prototyping before committing to a paid plan for production deployment
Cons
- Presence and Storage APIs are tightly coupled to Liveblocks infrastructure - migrating to a self-managed solution later requires significant rearchitecture
- $99/month Pro plan pricing for teams beyond the free tier is significant for early-stage products that have not yet monetized their collaborative features
- Pre-built components currently focus on React - teams using Vue, Svelte, or vanilla JavaScript have more manual integration work to do
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