Theory Forge

Theory Forge is a no-nonsense music theory trainer built for musicians who want to internalize the fundamentals through focused repetition — not passive reading.
Whether you're a complete beginner or brushing up after years away, Theory Forge meets you where you are and builds real fluency through drilling, not just familiarity.
DRILL MODES
• Intervals — identify and name intervals by ear and notation
• Scales — major, minor, modes, and more
• Triads — root position and inversions
• Build a Chord — construct chords from the ground up
• Build a Scale — assemble scales step by step
• Staff Reading — name notes on treble and bass clef
• Speed Drill — race the clock on staff reading
• Mixed Drill — randomized questions across all categories
FOUNDATIONS
Seven short lessons covering the core vocabulary before you drill. Complete them in order for best results, or jump straight in if you know your way around a staff.
TRACK YOUR PROGRESS
Session streaks, per-mode accuracy percentages, and achievement badges keep you motivated and show exactly where to focus next.
BUILT FOR EVERYONE
Beginner to advanced. Guitarist, pianist, vocalist, producer — if you read or write music, this is for you.
100% FREE. NO STRINGS.
No ads. No paywalls. No subscriptions. No in-app purchases. Ever. Just clean, efficient drilling that respects your time and intelligence.