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Ditto. If this was built with say, Qt, it would be very easy to run everywhere

Not just OSX, it is also just for one single version of OSX (Yosemite) so far.

I do not think I have ever seen a "beautiful" cross platform app.

Maybe blender.

I personally don't use it but I think the Atom[0] text editor is pretty attractive. Really there are plenty of examples, it's not impossible, you can make good looking apps with Qt without too much effort.

[0] https://atom.io/

I would argue that a text editor really stretches the definition of user interface. The non-text-editor chrome I am NOT a fan of, but I understand it's truly hard to make a good "native" app. These are rarely cross platform.

My previous example "blender" only passes because the interface is so damn weird it doesn't make sense on any platform. But it's consistent and easy to program.

Well, the text editor has just about as much UI as this calculator thingy, actually I'd say more.. That's why it came to mind as a good comparison.

> My previous example "blender" only passes because the interface is so damn weird it doesn't make sense on any platform.

Ha I definitely agree with you on that.