This is great! I'm not actually sure how prominent the CAGED sequence is in guitarist circles, but I was thinking it might be helpful to indicate the chord shapes.
Hope you can continue hosting it - I might use this to practice my scale visualization.
> it might be helpful to indicate the chord shapes
You can select notes on the innermost ring in the circles.
For example, select G as the base in the middle ring. Then select 1, M3 and 5 on the innermost ring. The fretboard will show you all the possible ways to finger the G major chord.
Hope you can continue hosting it - I might use this to practice my scale visualization.