u/KROQ86

It’s called Fret — fretboardonline.com

You pick a lesson (pentatonic, blues scale, Dorian, Mixolydian, etc.), a backing loop starts, and the fretboard lights up with safe notes and target notes for the current scale over real chord changes. Mic input tracks when you hit the correct scale tones.

No download or signup required. It includes 20 lessons ranging from beginner pentatonic shapes to advanced blues concepts, plus a free-play mode where you can explore any scale across the neck in real time.

I built it because I couldn’t find a tool that kept music theory connected directly to the instrument instead of separating it into static diagrams.