Thing is, each OS has its own design language and conventions. Trying to make one UI look and feel great in all of them is doomed to fail and feel awkward in al

Thing is, each OS has its own design language and conventions. Trying to make one UI look and feel great in all of them is doomed to fail and feel awkward in all of them. So either make a UI for each OS or go your own way and have your own design language.