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assistant-ui

Open Source React.js Library for AI Chat

Communication & CollaborationFree
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About assistant-ui

assistant-ui helps frontend developers add AI chat to their apps. Our product is used by several dozen companies, like LangChain, Stack AI, Browser Use, and Athena Intelligence. We're building an open source Typescript/React library and a backend as a service, with first class integrations into popular agent frameworks like LangGraph and Vercel AI SDK.

What assistant-ui does

Open-source React components and runtimes for building AI chat interfaces. It handles streaming, tools, and persistence in TypeScript. Works with AI SDK, LangGraph, and LangChain, or any backend through adapters. Ships for React, React Native, and Ink. The library is MIT licensed and free. Optional hosted cloud service provides thread persistence and history, with free, pro, and enterprise tiers.

Key features

  • Runtime handles streaming, tools, and reasoning
  • Works with AI SDK, LangGraph, LangChain
  • Ships for React, React Native, Ink
  • MIT licensed open source
  • Optional cloud thread persistence
  • CLI copies UI source into repo

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