Huh? Did you read the link? Did you notice the ONE screenshot clearly shows the app has a material-ui look.

I'm going to say this because I think you might not know this, but also because I think many others might not have thought about this:

Almost always, a programming language is UI agnostic. Swift SDK for Android means: You can now write Android Apps in Swift. This doesn't magically include Apple's components / SwiftUI. When you write code for a platform, specifically an SDK for an OS, all you do is expose that platform to that language.

So, as long the SDK/bindings are there, a new "Window" means whatever a the OS thinks is a Window. A Button is what is defined (or exposed/binded to) as a Button in Android.

Swift was sorta released for Windows: a new Window looks like a generic Win32 Window. The same one you would get if you used C, C++, Rust, etc..

All your examples are GREAT examples to explain how this works: - Flutter has "Cupertino" to allow people to use Flutter to make Apple apps, and not have to learn names/methods/interface of the native Apple UI. - React Native: A LOT of work was put in to make/bind Apple native objects to a React component. And the same for Android.

So again:

The Swift SDK for Android means you can write your Android apps in Swift. The same apps you might of wrote in Java or Kotlin, you can now use Swift. Meaning whatever it looked like in Java/Kotlin (using native api's), it would look like in Swift.

The SwiftUI, Apple's component library written/exposed to Swift, is something completely different.