Really cool! Like i_c_b mentioned my only feedback is that, even in the practice mode, there's a lot of negative feedback.
I'd recommend adding a step to the practice mode where whatever highlighted region of the fretboard you're practicing has all of the notes visible, and then over time the notes are taken away as you build up your memorization.
Noted! Thank you! I'm planning on building a Duolingo style spaced repetition system for this. I really wanted to work on more modules like Intervals and Triads (for selfish reasons) but enough people have made the point you made that I think its logical to address the issue.
Could you talk a bit about the negative feedback in practice mode? Is it the unpleasant buzzing when you tap the wrong note? What would be an alternative?
I'd recommend adding a step to the practice mode where whatever highlighted region of the fretboard you're practicing has all of the notes visible, and then over time the notes are taken away as you build up your memorization.