lynx

Lynx lets you write native mobile and web UIs using CSS and React-like syntax from a single codebase. It renders natively on Android, iOS, and web, with a multithreaded engine designed for fast startup and smooth interaction. Think React Native's promise, built from the ground up with web developers in mind.

Setup requires macOS for the best experience (Windows and Linux are not yet verified). You will need platform SDKs for Android and iOS builds, plus their Lynx Explorer app for testing. The toolchain is still young, so expect some rough edges in the build pipeline.

Completely free under Apache 2.0. No paid tier, no commercial version. Solo devs and small teams who already know CSS and React can start building immediately. Larger teams should evaluate carefully since the ecosystem is still maturing.

The catch: this is early-stage. The community and plugin ecosystem are tiny compared to React Native or Flutter. If you need production stability and a deep library of third-party components, those established frameworks are still the safer bet.