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The licensing has changed a bit over the past year. The biggest difference between the LGPL and GPL versions is that Charts and Data Visualization aren't available under LGPL, and Qt Quick is limited to OpenGL.

https://www.qt.io/licensing-comparison/

Qt is LGPL (3 ?), so you can use it for closed source proprietary projects assuming that it is possible to re-link your project (with Qt). I.e. you should use Qt as .so/.dll dynamic lib for desktop apps. For Android it is same as I understand. As for iOS - where as I remember you have to build static binary - just providing your .obj files is enough. So it is compiled, not open source.

If you use dynamic linking and target open platforms, like desktops, you can easily fulfill all the terms of the LGPL [1] without releasing your own code. See 3.7 of the Qt Legal FAQ [2].

[1] https://tldrlegal.com/license/gnu-lesser-general-public-lice... [2] https://www.qt.io/faq/#_Toc453700715

Qt is LGPLv3, not only GPL afaik?