OpenUI

About

Generative UI standard and toolkit from Thesys

OpenUI is an open-source standard for generative UI maintained by Thesys. Agents describe interfaces in OpenUI Lang (a compact streaming language, not JSON), and the same response renders through React, Vue, Svelte, React Native, email, or a script tag using your design system (shadcn, MUI, Ant, Radix, and others). OpenUI Gateway repairs invalid streaming output, keeps Chat Completions/Responses SDK compatibility, and can fail over across providers. Scaffold with `npx @openuidev/cli@latest create`; `setup-agent` adds instructions for Codex, Cursor, and Claude Code.

Features

• OpenUI Lang streaming generative UI (not JSON)
• Bring your own components and design system
• Works with major models and agent frameworks
• Gateway repairs invalid output before users see it
• React, Vue, Svelte, Angular, React Native support
• MIT open source

Install