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There are ways to analyze the content of your app so you know exactly what's taking all the space.

Tools can vary depending on what language you used. For example i wrote a small app using flutter and i used the flutter's app size tool.

Is it for iOS? Then, it could be the Swift runtime library.

Maybe your compiler isn't pruning dead code?

I think it could be all the compat /support libraries that try to give you the same API across different Android versions.