Writing your interface in the native language/toolkit and then interfacing it to a cross-platform backend is often a better solution than trying to shoe-horn ev

Writing your interface in the native language/toolkit and then interfacing it to a cross-platform backend is often a better solution than trying to shoe-horn everything into one GUI that won't fit to any OS properly. Which is especially true for Macs. I remember that the imeem guys did something similar with their chat/social app (defunct now).