I do not have first hand experience with distributing GTK apps on non-Linux systems, but I do know that: * Inkscape has a macOS version that looks, feels, and

I do not have first hand experience with distributing GTK apps on non-Linux systems, but I do know that: * Inkscape has a macOS version that looks, feels, and functions fairly nicely * Documentation for how to ship a GTK app for macOS is severely lacking (not sure about Windows) * Many cross platform apps choose Qt over GTK