>Not all code is created equal. That 30% that needs to be rewritten for each device could be difficult to tune for each platform. Native widgets in iOS do not w

>Not all code is created equal. That 30% that needs to be rewritten for each device could be difficult to tune for each platform. Native widgets in iOS do not work the same as native widgets in Andoid. Unless there is some magical abstraction layer (which doesn't appear to exist), you're potentially rewriting the most difficult code for each platform. Again, far better than writing ALL the code for each platform. And in a lot of cases the GUI code is not the "most difficult", it's just the one that cannot be easily written once for all platforms (and still look native). For example, if you make a music application, the sound engine, FFT, filters etc would be the difficult part (but it can be written just once) and the GUI layer is quite easy compared.