thesysdev/openui at 5.5K Stars With +399 Today: Open Standard for Generative UI Uses 67% Fewer Tokens Than JSON With Streaming-First Language

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OpenUI is a full-stack generative UI framework with a compact streaming-first language (OpenUI Lang), a React runtime, and built-in component libraries. LLMs define UI via typed components that constrain generation and auto-generate system prompts, achieving 67% fewer tokens than equivalent JSON. Progressive rendering streams structured UI as tokens arrive. Distributed as npm packages.