Apps built using Xamarin contain standard, native user interface controls and have access to the full spectrum of functionality exposed by the underlying platform and device, including platform-specific capabilities like ARKit and Android Multi-Window mode, and leverage platform-specific hardware acceleration and are compiled for native performance.

IOS AndroidPlatform-Specific C# Windows
Native IOS App Native Android App Native Windows Phone App
Shared C# User Interface Code
Shared C# App Logic