Interesting! How was Godot for a UI intensive application like this?
I have been using it for games and am totally enamoured by the speed, pragmatism and simplicity of the engine. I would totally use it for non-game projects.
A small aside, this reminds me of one of my first attempts at a digital side hustle, a website called "What fucking chord is this" that let you enter the notes, and get back all the different chord names.