A basic flutter “Hello World” app will be approximately 10mb in iOS and 4mb in Android.2 Mar 2018
Read moreHow do you reduce flutter app size and obfuscation?
Reducing app size The larger an app, the more space it requires on a device, the longer it takes to download, and it may break the limit of useful features like Android instant apps. When building a release version of your app, consider using the –split-debug-info tag . This tag can dramatically reduce code size.
Read moreHow do I know the size of my flutter app?
How to open Dev Tools in android studio.
Read moreHow do I optimize my flutter app?
Performance improvements for mobile apps in Flutter
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