assistant-ui

assistant-ui is a comprehensive frontend library that enables developers to create beautiful, enterprise-grade AI chat interfaces in minutes. Whether you're building a ChatGPT clone, a customer support chatbot, an AI assistant, or a complex multi-agent application, assistant-ui provides pre-built components and state management layers to accelerate development.

Core capabilities include Instant Chat UI, which offers pre-built, customizable chat interfaces available out of the box for quick iteration; Chat State Management, which is powerful state management optimized for streaming responses and efficient rendering; High Performance, optimized for speed and efficiency with minimal bundle size; and Framework Agnostic design, working seamlessly with any backend system, including Vercel AI SDK, LangGraph, Mastra, or custom solutions. Advanced features include composable primitives for building any chat UX such as message lists, input, threads, and toolbars, along with production-ready functionality with streaming and attachments, keyboard shortcuts, and accessibility support by default.

assistant-ui works with multiple backends, including Assistant Cloud for managed chat persistence and analytics; AI SDK for integration with Vercel AI SDK connecting to any supported provider; LangGraph for integration with LangGraph and LangGraph Cloud; Mastra for integration with Mastra agents, workflows, and RAG systems; and Custom options to use assistant-ui with your own backend or streaming protocol.

To begin using assistant-ui, you can initialize it in a new project or add it to an existing React project. You'll need to add an .env file with your OpenAI API key and then start the application.

The library is designed specifically for developer experience with sensible defaults, battle-tested primitives, and strong TypeScript support. It's composable rather than monolithic, allowing customization without sacrificing production-readiness.