Very good, few ideas
I think it would be nice to eliminate same notes occuring after each other. Also i found it a bit uncomfortable that i always have to look up on my phone and then down the fretboard. I think adding some text to speech would be a nice touch. And then some sound that indicates that i found the correct intervals. Could be an additional feature that can be turned on. Apart from that i already broke out of only seeing shapes and scales and now i can basically construct any chords real time on any part of the fretboard. :) Been playing for 15 years so its awesome to have somewhere to evolve my playing.