Swift Playgrounds 4 come until this year. Sure. Apple say about. https://developer.apple.com/forums/thread/695470

If you want to build an App, you should use Xcode. This is IDE, so you can develop on many languages. Xcode has SwiftUI, so you can easily build an app. And can Submit to AppStore.

Thanks. I’ll check them.

Thanks for best answer. I‘m going to fill out the form in English.