I love the idea, and considered using this for a side project, but ultimately went a different route. The biggest issue for me was the somewhat constrained ide

I love the idea, and considered using this for a side project, but ultimately went a different route. The biggest issue for me was the somewhat constrained idea of "cross platform" it's working with. There was an attempt at a Cocoa port, but it seems even less active than the main project. https://github.com/ewmailing/IupCocoa https://github.com/ewmailing/IupCocoa Ultimately, I decided that a careful addition of a minimal amount of C++ code to use wxWidgets was less kludgey than using a half-baked Cocoa port or coaxing IUP GTK to work with Mac GTK. I've been mostly happy with that decision.