Fretboard Lab

Fretboard Lab helps guitar teachers, songwriters, arrangers, and players find chord voicings that are actually playable. Instead of showing one static chord shape, it explores alternatives across the fretboard and ranks them by position, span, open strings, difficulty, tuning, and progression context.

Use it when Cmaj7, Am7, Dm7b5, G13, ii-V-I, I-V-vi-IV, DADGAD, open tunings, or smoother voice leading need more than one generic diagram. It is useful for lesson sheets, arranging, harmony study, and exportable fretboard diagrams.

It is not a lesson course, song tab library, or generic scale encyclopedia. It is an offline chord voicing workbench for turning symbols and progressions into playable choices.