Why iOS build's volume is so high?

Unity Engine
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1

When make ios build, Why iOS build’s volume is so high? than android build?

for example, my game’s ios build is 500mb, whileas android build is 50~100mb

because unity make as xcode build?

final build’s volume on iphone is similar with android?

2

To find the iOS build size: Open the Xcode project, Archive it, then click on ‘estimate build size’ (or some similar text, I don’t have it open right now)

3

And also check out asset sizes from Editor log, you might find some assets that are compressed on Android, but uncompressed on iOS
http://docs.unity3d.com/Documentation/Images/manual/ReducingFilesize-0.jpg