OpenUI vs. assistant-ui Comparison


OpenUI Thesys	assistant-ui	+	+
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About OpenUI is an open-source (MIT) generative UI framework for AI agents. Instead of plain text, your agent writes OpenUI Lang, a compact, streaming-first language, and OpenUI renders it progressively as real UI: charts, tables, forms, cards and layouts. Rendering is safe by default: the model can only use components you register and no generated code is executed, so your design system stays in control. A framework-agnostic core powers first-party runtimes for React, Vue, Svelte and Angular, with ready-made chat interfaces and integrations for LangChain/LangGraph, the Vercel AI SDK, Mastra, Google ADK, assistant-ui, CopilotKit, AG-UI and A2UI. In its published benchmark, OpenUI Lang uses about half the tokens of equivalent JSON UI formats, so interfaces stream faster and cost less.	About assistant-ui is an open source React toolkit for production AI chat experiences, designed to bring the UX of ChatGPT into your own app. It helps developers create beautiful, enterprise-grade AI chat interfaces in minutes for React, React Native, and terminal applications. Whether you are building a ChatGPT clone, a customer support chatbot, an AI assistant, or a complex multi-agent application, assistant-ui provides frontend primitive components and state management layers so you can focus on what makes your application unique. It includes instant chat UI with pre-built, beautiful, customizable chat interfaces out of the box, making it easy to quickly iterate on an idea. Its chat state management is optimized for streaming responses, interruptions, retries, multi-turn conversations, and efficient rendering. assistant-ui is built for high performance, with optimized rendering and a minimal bundle size to keep AI chat interfaces responsive.
Platforms Supported Windows Supported Mac Supported Linux Supported Cloud Supported On-Premises Supported iPhone Supported iPad Supported Android Supported Chromebook Supported	Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported
Audience Developers building AI agents, copilots and chat apps who want agents to answer with interactive UI instead of text	Audience Frontend and AI app developers who need production-ready chat components, streaming state management, and flexible integrations for building polished AI assistants
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Not Supported	API Offers API Not Supported
Screenshots and Videos No images available	Screenshots and Videos View more images or videos
Pricing Free Free Version Supported Free Trial Not Supported	Pricing $50 per month Free Version Supported Free Trial Not Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software

Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information Thesys Founded: 2024 United States www.openui.com	Company Information assistant-ui United States www.assistant-ui.com
Alternatives LangChain	Alternatives CopilotKit
Crewship	Swarm OpenAI
Agent Communication Protocol (ACP) The Linux Foundation	AgentKit OpenAI
LangGraph LangChain	OpenChiip Harness OpenChiip
FirstHelm View All	WindChat View All
Categories AI Development Supported Development Frameworks Supported	Categories Agentic AI Supported AI Agent Frameworks Supported UX Supported

Integrations LangChain Supported A2UI Supported AG-UI Supported Agent Development Kit (ADK) Supported ChatGPT Not Supported Claude Not Supported CopilotKit Supported Gemini Not Supported Grok Not Supported LangGraph Supported Mastra AI Supported Model Context Protocol (MCP) Not Supported Perplexity Not Supported React Not Supported React Native Not Supported Vercel AI SDK Supported shadcn/ui Not Supported Show More Integrations View All 8 Integrations	Integrations LangChain Supported A2UI Not Supported AG-UI Not Supported Agent Development Kit (ADK) Not Supported ChatGPT Supported Claude Supported CopilotKit Not Supported Gemini Supported Grok Supported LangGraph Not Supported Mastra AI Not Supported Model Context Protocol (MCP) Supported Perplexity Supported React Supported React Native Supported Vercel AI SDK Not Supported shadcn/ui Supported Show More Integrations View All 10 Integrations
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