If you've already looked at React Native then there's a good React-Native-to-Flutter cheatsheet on the Flutter site - <a href="https://flutter.dev/docs/get-started/flutter-for/react-native-devs" rel="nofollow">https://flutter.dev/docs/get-started/flutter-for/react-nativ...</a>
As I know, Flutter is really good at MVP and even final product development.
But in the end, nothing can be natives, Kotlin for Android and Swift for iOS