How can I see the size of my apps?

the download size of a minimal Flutter app (no Material Components, just a single Center widget, built with flutter build apk –split-per-abi ), bundled and compressed as a release APK, to be approximately 4.3 MB for ARM, and 4.6 MB for ARM 64 .

Open Play Console and go to the App size page (Quality > Android vitals > App size).