For rudimentary GUIs I like rust, specifically the immediate mode lib called egui. It won't be super fancy but you can do enough with it, it feels responsive,

For rudimentary GUIs I like rust, specifically the immediate mode lib called egui. It won't be super fancy but you can do enough with it, it feels responsive, and I can show my basic controls without too much effort. Mind you, what I use it for is not sexy at all, really just something one might use a spreadsheet for.