OpenUI

OpenUI is an open-source (Apache-2.0) UI prototyping playground from Weights & Biases that lets you describe an interface in natural language and watch an LLM render it live in the browser. You type a prompt like "a pricing card with three tiers and a comparison table," and OpenUI produces working HTML/Tailwind, previews it in a sandbox, and lets you iterate by asking for changes ("make the middle tier stand out," "add a monthly/annual toggle"). Once the layout is close, you can convert the same component into React, Svelte, Vue, or Web Components without leaving the app.

The project is model-agnostic. It ships with adapters for OpenAI, Anthropic Claude, Google Gemini, Groq, Cohere, Mistral, and anything else routable through LiteLLM, plus Ollama for running local models (Llama, Qwen, etc.) with no per-token cost. That flexibility is the main reason teams pick it over closed hosted alternatives: you point it at your own key or your own GPU box, and the generated code is yours.

OpenUI is aimed at frontend developers, designers who write a bit of code, and internal-tools teams who want a fast sketchpad for component ideas before wiring anything into a real codebase. Typical workflows include roughing out marketing sections, exploring dashboard layouts, generating starter components for a design system, and using it as a teaching tool for prompt-driven development. The hosted demo at openui.fly.dev is a shared reference deployment; serious use is expected via `docker run` or a source install, where you control the models, rate limits, and data.