An open-source framework to help you write native User Interface applications for Mobile, Web, Desktop and beyond, faster and with fewer bugs — by sharing your application’s behaviour as a single and easy-to-test Rust core that you can reuse with confidence on every platform.

Most apps need to be built three times – once for iOS (hopefully in Swift), once for Android (hopefully in Kotlin), once for web (hopefully in TypeScript) – with no code reuse, no saving of effort, and no learning from issues. Clearly, there’s no economy in doing the same thing three or more times, and so the industry has been on a years-long hunt for a way of sharing effort and reusing code — a way of building apps just once.

But a good solution to this problem seems to forever elude us. Maybe we’re trying to answer the wrong question...?

We have a number of options that we can use today; React Native (but probably have to think about the Web separately); Kotlin Multiplatform Mobile (KMM), or Flutter (with Dart); Or we can go hybrid and use something like Capacitor with Ionic.

None of these are bad choices, but they all have significant downsides. We think we can do better than that — mostly by deciding which bits are worth sharing and which bits are not.