Fretboard Trainer for Chords, Not Only Note Names

A fretboard trainer usually helps guitarists memorize notes, intervals, and scale positions. That is valuable, but it is only one part of fretboard fluency. Fretboard Lab approaches training through playable chord decisions. When you enter a chord symbol, the app shows multiple voicings and lets you compare them by fret position, span, open strings, and difficulty. This turns theory into physical choices: which Cmaj7 works before an F#m7b5, which D chord stays near the melody, which shape is easier in Drop D, and which inversion sounds less crowded with a bass player. Teachers can use this as a practical trainer by asking students to find three voicings for the same chord, compare their intervals, and export diagrams for practice. Songwriters can explore alternate tunings without guessing. Instead of drilling isolated note names, Fretboard Lab helps players connect names, intervals, shapes, sound, and hand movement. That makes fretboard learning more musical and less abstract.