Liveblocks
Liveblocks · Coding
Liveblocks is realtime infrastructure that lets developers add multiplayer sync, comments, notifications, and AI copilots to their apps, so people and agents edit the same data without conflicts.
About Liveblocks
What Is Liveblocks
Liveblocks is a hosted realtime collaboration infrastructure platform that handles the messy parts of multiplayer software. It keeps shared data in sync across every connected user and AI agent, merges concurrent edits automatically, and stores everything without you running your own backend. Teams building collaborative AI lean on it precisely because the sync layer is already solved.
The core problem it solves is concurrency. The moment two people or an agent touch the same document, you either build conflict resolution yourself or lose edits. Liveblocks ships that logic as a multiplayer sync engine, delivered through ready-made React components, SDKs, and APIs, so a small team can add collaboration in days instead of months.
The tradeoff is lock-in. Your collaboration layer lives on Liveblocks servers, and while Enterprise customers can self-host, everyone else runs on the hosted service. Pricing is credit-based, so costs scale with usage rather than a flat seat fee.
Getting Started
- Create a free account at liveblocks.io and open a new project in the dashboard.
- Install the client library for your stack, such as
@liveblocks/react, and connect it with your API key. - Swap in the pre-built components for the feature you want, like the collaborative text editor or comment threads.
- Authorize users through your own auth, then ship the room to production and watch usage on the dashboard.
Product Information
A quick look at Liveblocks's pricing, supported platforms, and performance.
Best for
The users, tasks, and scenarios where this tool fits best.
Users
- Frontend and full-stack developers
- Startup engineering teams
- Product teams adding AI agents
Tasks
- Adding multiplayer editing to a text editor or whiteboard
- Building in-app commenting
- Wiring notifications into email or Slack
- Letting an AI agent edit shared content
Scenarios
- Prototyping a collaborative feature over a weekend
- Scaling a shipped app past its first thousand users
- Meeting enterprise security requirements
Key features
Realtime Sync Engine
Liveblocks keeps shared state consistent for everyone in a room, merging concurrent edits automatically through conflict-free data types. It handles persistence, reconnection, and offline changes so nothing gets lost when someone closes a tab or drops a network. Solo sessions cost nothing; billing only starts when two or more participants share a room.
Comments and Threads
Need to add comments to an app? The comments product attaches threaded conversations to any part of it, from text editors to media players and whiteboards. You can shape threads with custom metadata and either use the ready-made React components or build a custom interface from primitives. Mentions, attachments, and private threads are built in.
Notifications
Liveblocks pushes alerts out of your app when collaborative events happen, such as a mention, a reply, or a reaction. It can deliver emails, Slack messages, and other channels, and non-collaborative events from your own code are metered separately. This keeps people coming back to a document after they've stepped away.
AI Copilots
You add an AI assistant to a product by dropping in the
Agents That Edit Alongside Users
AI agents from your backend can write to a shared document as if they were another participant. They connect over WebSocket for live updates or HTTP for simple ones, and their presence shows up in the room. Human and agent edits merge without conflicts, and an agent's workflow state can stream into the document as it runs.
SDKs, REST API, and MCP Server
The platform covers JavaScript, React, Node.js, Python, Yjs, Redux, Zustand, and editor-specific packages for Tiptap, Lexical, and ProseMirror. A REST API handles server-side work, and an official MCP server lets AI tooling inspect rooms, threads, comments, and storage. Auth and permissions integrate with your existing login system.
Pros and cons
Pros
- Pre-built React components and hooks cut the time to add collaboration from months to days.
- Conflict-free data types merge concurrent edits automatically, so users don't lose work.
- The free plan is permanently free with no credit card, which makes it easy to evaluate.
- Metered overage bills at the same rate as included credits, with no markup on Pro and Team.
- Broad collaboration SDK coverage spans JavaScript, Python, Yjs, and the major text editors.
Cons
- Pricing is credit-based rather than a flat fee, so a busy app's bill depends on usage you have to track.
- The Free plan blocks shipping without the Liveblocks watermark and caps each feature hard.
- SSO and SOC 2 sit behind the Team plan, which starts at $600 per month, so small teams pay a lot for enterprise security.
- Self-hosting is only available to Enterprise customers and only as a paid add-on.
Frequently asked questions
Liveblocks is for adding realtime collaboration to an app. Developers use it to sync shared data, add comments, send notifications, and embed AI copilots, all without building a multiplayer backend from scratch.
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