It should be said occasionally: the Qt Commercial License is terrible. It might not be all that expensive, but it’s rather clunky for device creation, and most importantly, comes with a “Prohibited Combination” definition that says “any effort to use .. Licensed Software with any software created with .. Open Source Qt”. I certainly can’t interpret that in any other way than “there is a tremendous amount of valuable Open Source software, developed entirely independently, like KDE Frameworks, Kirigami, libQuotient, .. and you can’t use it.” It really drives home the negative value of a Qt Commercial License. – Which is why I’m glad I care only about the Open Source bits.