Guitar Theory Studio: Scales

Bradappz

In-app purchases

About this app

Guitar Theory Studio puts music theory on the fretboard: guitar scales and modes, the CAGED system, chord progressions with smooth voice leading, arpeggios, ear training, and a daily theory quiz, all computed by one theory engine and drawn on a physically accurate neck.

EVERY TOOL IS FREE
Explore any guitar scale, key, or CAGED shape on the Fretboard Explorer. Build and hear progressions with smooth voice leading in the Chord & Progression Builder — with a library of 25 classic progressions, every chord numbered in both Nashville Number System notation and Roman numerals. Sweep arpeggios for every chord in a key. Drill every 7-note scale in its seven three-notes-per-string (3NPS) positions, plus the pentatonic boxes, with the metronome-driven Practice Loop at any tempo — or start guided practice and it walks you through every position, timed, hands-free. No account needed.

THE DAILY — A MUSIC THEORY QUIZ FOR GUITAR
Ten quick questions a day — read the neck, know the key, trust your ear. Same puzzle for everyone, new one at midnight, and a streak that grows every day you show up. Miss a question and it teaches you the answer. Interval and chord-quality questions double as ear training. Tap Test Me inside any tool for five questions about exactly what is on screen.

ASK — AI THAT SETS UP THE TOOL FOR YOU
Type a question like "show me D Dorian" or "a 12-bar blues in E" and the right tool opens, already set up. The AI only picks the tool and settings — every note and spelling is drawn by the same theory engine as the rest of the app, so the answer on the fretboard is always right.

GTS PRO — YOUR PERSONAL THEORY TRAINER
Workouts built from what you keep missing. Mastery levels for every skill, revisited on schedule just before you'd forget. Full progress history with practice-time tracking. Unlimited Test Me, expanded Ask, unlimited saved presets. GTS Pro is a monthly or yearly subscription with a 7-day free trial — manage or cancel anytime from your Play account settings.

Notes and chords are spelled the way the key is actually written — B flat in F major, not A sharp — so what you read here matches what you read anywhere else.

Whether you're learning your first guitar scale or building a music theory practice routine that actually sticks, Guitar Theory Studio keeps theory and the fretboard in the same place.

What’s new

• Morning reminder: turn it on after any Daily and the app tells you when tomorrow's puzzle is ready.
• Today's loops: a ten-minute practice plan built from what you've played and how fast. First plan free.
• Tempo ladder: the Practice Loop climbs as you play and remembers your best tempo per position.
• Play it in 3rds: hear every scale note with its harmony partner, then loop it.
• A fairer Daily: ear questions wait until you've listened.
• GTS Pro Lifetime: pay once, keep Pro for good.