assistant-ui

assistant-ui is an open-source React toolkit designed to integrate ChatGPT-style chat experiences into applications.

FreeWebOpen sourceMultimodal

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Overview

assistant-ui is an open-source React toolkit designed to integrate ChatGPT-style chat experiences into applications. It provides production-ready UI components, state management for streaming and multi-turn conversations, and optimized rendering for high performance. The tool supports integration with various LLM providers, including LangGraph and Vercel AI SDK. It targets frontend developers and software teams building conversational AI agents. The core library is available forever for free under the MIT License, while the managed backend service offers a Pro plan starting at $50 per month.

Key features

Production-ready React chat UI components
State management for streaming and multi-turn conversations
Integration with LangGraph, Vercel AI SDK, and LangChain
Managed backend service with chat history and thread management
Customizable theming and optimized performance

Pros & cons

Collected from user feedback found in web search

Cons

TypeScript/React 전용 라이브러리로 Vue, Svelte, vanilla JS 미지원

Pricing

FreeStarting price: Open source (free)

View pricing page

Verified on: 8/30/2026

Use cases

Building stateful conversational AI agents
Integrating ChatGPT-style UX into React applications
Managing real-time streaming chat interfaces

Who it is for

Frontend developerssoftware teams

Integrations

OpenAIClaudeVercel AI SDKLangChainTailwind CSSNext.jsVite

How we verified this

Company, pricing, and feature details come from the primary sources below and our latest verification pass. When sources disagree, the official source and the most recent check win.

Last verified 08/30/2026Verified sources: 1