LGPL is one. It is quite permissive license but it has its own little problems. HTML is another one. HTML gets better support on iOS and Android and there will

LGPL is one. It is quite permissive license but it has its own little problems. HTML is another one. HTML gets better support on iOS and Android and there will be no reason to use something else in the future. It is much better when your app is small than it takes extra 12Mb (Qt libs). There might be other little reasons why it might not fit for you because of technological reasons. Weight Qt against your requirements well. I really like Qt/QML but it is not good for everything.