I just discovered skip.tools yesterday. Write in Swift / SwiftUI, transpiles to native Android / Kotlin / Jetpack Compose, with some added compatibility layers.
nostr:note1fxqwqcnt6fdufd372xmax25c23dq34r4vys5w6lm4gw3922pkcysq5zqg6 

 is swiftui open source? 

 The SwiftUI framework is closed source. The Swift language is open source. 

 oh jesus