IOs App much bigger than Android-App

Why is my IOs app 5 times bigger than the Android app??

IOs:

 Uncompressed usage by category:
 Textures      445.1 mb     96.9% 
 Meshes        0.0 kb     0.0% 
 Animations    26.6 kb     0.0% 
 Sounds        5.3 mb     1.1% 
 Shaders       19.6 kb     0.0% 
 Other Assets  1.1 mb     0.2% 
 Levels        813.5 kb     0.2% 
 Scripts       3.1 mb     0.7% 
 Included DLLs 3.9 mb     0.9% 
 File headers  129.3 kb     0.0% 
 Complete size 459.4 mb     100.0% 

Download Size: 96,2 MB

Installed Size: 518 MB

Android:

 Uncompressed usage by category:
 Textures      308.6 mb     95.2% 
 Meshes        0.0 kb     0.0% 
 Animations    26.6 kb     0.0% 
 Sounds        5.3 mb     1.6% 
 Shaders       28.9 kb     0.0% 
 Other Assets  1.1 mb     0.3% 
 Levels        820.1 kb     0.2% 
 Scripts       3.1 mb     0.9% 
 Included DLLs 3.9 mb     1.2% 
 File headers  1.3 mb     0.4% 
 Complete size 324.1 mb     100.0% 

Download size = 78 MB

Installed size = 101 MB