C# better than java, maybe but than Kotlin ? That's a very subjective opinion. Apps written in Xamarin and kotlin work very differently : -with Xamarin you ha

C# better than java, maybe but than Kotlin ? That's a very subjective opinion. Apps written in Xamarin and kotlin work very differently : -with Xamarin you have to add the Xamarin runtine and depend on its integration. This brings several downsides : http://www.slideshare.net/KonstantinLoginov/we-are-ditching-xamarin-why http://www.slideshare.net/KonstantinLoginov/we-are-ditching-... -Kotlin outputs bytecode, so from the outside, it is just the same as any android app written in java. The output is a standard android app with one more library (the standard kotlin lib with all its base methods)