One is a new React framework that aims to unify web, native, and local-first development, allowing developers to build websites and native apps with a single codebase. It is built on top of Vite and provides features such as typed file-system routing, per-page render modes, and loaders. The framework is designed to be fast and simple, with a focus on making full-stack development easier. One is currently in beta and has a companion framework called Zero, which is still in private beta.