If Codename One didn't exist, Kotlin Multiplatform is probably the platform I'd choose. I prefer Java, but Kotlin is a good language, and KMP was one of the strongest platforms we measured against in the Flutter post this week. Its first take on UI leaned on heavyweight native widgets, the way React Native does. The team learned from that, and Compose Multiplatform today is a good product built by people who care about performance.

What is Codename One? Codename One is an open-source framework for building native iOS, Android, desktop, and web apps from a single Java or Kotlin codebase. Learn more at codenameone.com .

So this post isn't about KMP being bad. KMP is good. This is also good, and in a few ways better. Your Compose code now builds as a Codename One app, so it reaches more targets and did less work per frame on our benchmark. You don't have to pick one forever: the same commonMain builds both ways.

What you keep

There's no transpiler here.…