OpenUI

OpenUI is an open-source toolkit that makes your AI agents generate user interfaces from your own components. Instead of outputting clunky JSON or plain text, your LLM responds in a lightweight language called OpenUI Lang, which a renderer parses into live, interactive UIs in real time. You define the components — your design system, your library — and the model composes them on the fly. The result is responsive, streaming-first UI that queries live data and connects directly to your backend tools.

What sets OpenUI apart is its efficiency and flexibility. Compared to JSON-based rendering, OpenUI uses 67% fewer tokens and renders three times faster. It works with any major LLM (OpenAI, Anthropic, Gemini, etc.), any UI library (React, Vue, React Native, and more), and any agent framework (Vercel AI SDK, LangChain, CrewAI). The spec is streaming-first, meaning the interface appears progressively as the model speaks, not after the full response. It's safe by default — the LLM only composes your registered components, never executes arbitrary code. OpenUI Cloud adds production-grade features like cross-browser compatibility, error correction, model fallbacks, and artifact generation.

This toolkit is built for developers and AI engineers who want their agents to do more than just chat — they want them to build dashboards, support tools, CRM views, and project management interfaces automatically. It's especially useful for teams that already have a design system and want generative UI without rewriting their stack. If your agent needs to present data, collect input, or guide users through workflows, OpenUI lets you skip the manual UI wiring and let the model handle it.