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None of those UI libs work on Android or iOS.

I think that's a huge part of it. Most of the users nowadays are using smartphones and tablets.

Qt does.

It is very niche, and again only if you go with C++. For most Apps that are not games, using C++ is probably overkill on mobile just so you can use Qt. And you will still have to come up with a mobile optimized UI, as a standard desktop UI layout will just not work on 5" screens.

https://wiki.qt.io/Language_Bindings

> And you will still have to come up with a mobile optimized UI, as a standard desktop UI layout will just not work on 5" screens.

No tool will magically solve this problem for you. Qt has excellent support for responsive design if that's how you'd propose to solve it.

And no, Qt is not very niche.

Qt has done a fantastic job in this space. It is also isn't cheap. It is only free for GPLv3 software.

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