Yes. Qt as a framework comes with a built-in declarative markup language called QML (a superset of ECMAScript). Full IDE support for QML including debugging/pro

Yes. Qt as a framework comes with a built-in declarative markup language called QML (a superset of ECMAScript). Full IDE support for QML including debugging/profiling and also a visual design/editing mode are unique to Qt Creator. You can use Qt Creator while ignoring or perhaps even without realizing this is there (since also many, though increasingly fewer, Qt apps are written in pure C++ without any QML use), but if you do use Qt, it's of course a large potential value add.