I am sitting next to 5 devices, all 5 of them given a link can open a browser page and do what functionality most apps require, draw a ui, take input, process s

I am sitting next to 5 devices, all 5 of them given a link can open a browser page and do what functionality most apps require, draw a ui, take input, process some output, save stuff etc only 3 of those devices can actually run arbitrarily compiled apps, and of those 3 you have to build against an entirely different ecosystem (osx, ubuntu and android) sure you can get a c compiler in most platforms, but that doesnt mean native apps are portable, they are by definition not