Free, interactive tools for working things out yourself.
Built in your browser, no download or install — print diagrams, drill chord changes, build scales and chords from their formulas, work out keys, and train your ear. Same systems as the books and free PDFs, just interactive.
Chord Change Trainer
Pick two chords, run the clock, count how many clean changes you land — then watch the number move as your technique does.
Fretboard Printer
Build and print your own guitar fretboard diagrams — any scale, chord, or arpeggio, in any key, tuning, or fret range.
Chord Builder
Build any chord from its formula and see practical shapes for it across the neck.
Scale Builder
Build any scale from its formula and see it mapped across the full fretboard.
Exotic Scales
Step outside major and minor — build and explore exotic scales and modes across the neck.
Triad Mapper
Easily map out and learn major, minor, diminished, and augmented triads all over the guitar neck.
Blues Chords
Blues voicings and progressions, mapped out and ready to use across the neck.
Blues Soloing
Work out what to play over blues changes, mapped across the fretboard.
What Key Am I In?
Work out the key from any chord progression.
Notes on the Neck in 12 Days
One major triad per day — all 12 notes learned in two weeks, through music, not memorization or tedious drills.
Holdsworth Chord Explorer
Voicings and inversions in the Holdsworth style, built and explored across the neck.
Riff Cells Pro
Rank #1 for guitar improvisation — build phrases by ear instead of drilling patterns.