Over 10000 devs used our API for AI interfaces - now we are open sourcing it

AI agents got smarter. Their interfaces didn't. Ask an AI to analyze your sales pipeline and you get three paragraphs. You should get a chart.

We've spent the last year building Generative UI used by 10,000+ developers, and the biggest lesson was that JSON-based approaches break at scale. LLMs keep producing invalid output, rendering is slow, and custom design systems are a pain to wire up.

So we built OpenUI Lang, a rendering spec inspired by code rather than data formats. LLMs generate it reliably the way they generate well-formed functions. The benchmarks: up to 67% fewer tokens, 3x faster rendering, streaming-native, and safe by default (no arbitrary code execution).

Today we're open sourcing it. Model-agnostic, framework-agnostic, design-system agnostic.

Show us your support by starring or contributing to our repo - https://github.com/thesysdev/openui