Interesting solution: using Universal Windows Platform (UWP) C#/XAML to run native mobile apps on iOS, Android & Web.
It is similar to (now Microsoft) Xamarin, but using variant of XAML
that is same as on Windows & Visual Studio.
If web GUI performance was improved a bit sooner, all this mobile variety would not be needed.
Open Sourcing Uno with Francois Tanguay and Jerome Laban @ .NET Rocks! vNext
nventive/Uno: The Uno Platform, the UWP bridge for iOS, Android, and WebAssembly @ GitHub