The best interactive guitar UI I've ever found is all-guitar-chords.com and I use several of its features regularly. It might not be built with the hotness but the reverse scale and reverse chord features are really nice and the main use case I can think of for using something like this. I'd like to see this as an open source library and I've started on attempts several times but never finished.
I think what would be cool is a "core" functional library written in typescript with all the basic well-unit-tested functions that could be used across different js libraries.
Then, for react, a library like react-table that just exposes the functions via hooks (headless/agnostic to ui). then the user could implement the UI as they please using the hooks.
Edit: _Obviously_ this project looks really cool and I love react so I'll be playing around with it for sure. Props to the author.
I can't endorse all-guitar-chords.com enough. Arguably, it does need a modern facelift even though I'm fine with the old adobe flash look. But an all-guitar-chords-esque library to port to the UI of your choice is a pretty good idea.
Edit: _Obviously_ this project looks really cool and I love react so I'll be playing around with it for sure. Props to the author.