Fretforge: Fretboard Theory

Completely free — no account, no ads, no subscription. Works fully offline: lessons, drills, tuner and metronome all run on your device.

Fretforge nails guitar theory to the fretboard. Learn it, drill it, look it up, and use it — one app, fully offline, completely free.

LEARN • 52 bite-size lessons in 9 chapters, from "seven letters" to modes • Every concept is drawn on a real fretboard diagram, not a staff • Chapter quizzes to lock it in

DRILL • 6 practice modes: Find Note, Intervals, Build Chord, Name Chord, Scale Shapes, Mode Colors • 90-second Rush mode, star ratings, streaks and badges • A 10-question Daily Drill that mixes everything you've learned

LOOK UP • Interactive circle of fifths with diatonic triads and 7th chords • Chord dictionary: every shape across the whole neck, tap to hear • Scale shapes with root highlighting — degrees or note names

TOOLS • Tuner with 6 tunings: Standard, Eb (half-step down), D standard, Drop D, Drop C and DADGAD — nearest-string guidance tells you which way to turn, tap a string to lock it • Metronome with per-beat accent patterns (accent / normal / silent), so displaced funk accents are one tap away; 2/4–6/4, tap tempo • Record practice takes over the metronome and review them with beat-aligned waveforms • Full-screen flash mode for loud rooms

YOUR DATA STAYS YOURS No account, no server, no analytics, no ads. The microphone is used only for the tuner and your own practice recordings — audio is analyzed on the device and recordings never leave it.

Everything is free. 24-fret diagrams, note names or numeric (1-2-3) naming, English and Simplified Chinese.