Apple will say that SwifUI is already cross platform. 😂 I work in it daily and will say that it’s quite nice and easy to develop in. There are plenty of drawbacks and the “magic” can be quite heavy at times. Compose is making inroads into the spaces that Flutter has been working on. Jetbrains made a desktop port using the JVM. They also have web and iOS ports in various stages. It’s all very early days for them.

I’m still doing all of my side development using Flutter. It’s barely a question in my mind to consider anything else at this point.