FastUI is made up of 4 things: fastui PyPI package — Pydantic models for UI components, and some utilities. While it works well with FastAPI it doesn't depend on FastAPI, and most of it could be used with any python web framework. @pydantic/fastui npm package — a React TypeScript package that lets you reuse the machinery and types of FastUI while implementing your own components @pydantic/fastui-b