Visualize the Guitar Fretboard - Find The Fret. Fretboard Learn - Apps on Google Play. Fretboard Guru - Notes Trainer. How to Fret a Guitar: Learn Guitar Fretting Techniques. FretMap - Interactive Guitar Fretboard. Fret Trainer App Now on iOS and Android - The Guitar Journal. Notes on the Bass Guitar Fretboard Diagrams. How to Fret a Guitar Properly in 3 Simple Steps - String Success. music_theo..