See the theory.Play it instantly.
A working guitar theory lab, not a wall of text. Build any scale or chord and watch the fretboard light up, walk the circle of fifths, train intervals by ear and keep time in the rhythm lab. When you want the full written system, the 13-chapter e-book takes you from your first note to modes and improvisation.
Five tools that make theory visible
Everything runs in your browser. Tap any lit position on the fretboard to hear the note, so you can connect what you see with what you play.
Standard tuning (E A D G B E), frets 0–12. Tap a lit note to hear it. The root is the violet dot.
Every chord tone across the neck. The formula pills show which scale degree each note is.
Where it lives on the neck
Same note, two names: what you call an interval depends on direction. This tool always counts upward from the root.
D · D U · U D UDown-down-up-up-down-up — the fundamental strumming patternD · D U · D UFour-beat pattern for 4/4 songs with a strong backbeatD U · D U · D UStraight eighths — the workhorse for practice and warm-upsD · · U · · UThree-beat waltz feel for 3/4 and 6/8The metronome uses your browser's audio engine. Turn your volume up before starting.
What you actually master
Eight stages, in order
The e-book follows this sequence exactly, so you always know what you have covered and what comes next.
Thirteen chapters
Written for players who already own a guitar and want the theory to make sense of what their hands are doing.
Before you start
Get the Guitar Theory Lab e-book
Thirteen chapters from reading the fretboard to modes and improvisation, with fretboard diagrams, chord formulas, practice drills and ear-training exercises. Read it alongside the lab and the theory finally sticks.