Theory Forge

Most musicians learn their instrument by feel. Theory comes later - or never. Theory Forge is built for players who are ready to close that gap.

Not a video course. Not a chord dictionary. A drill app - designed to make music theory stick through active repetition, not passive reading.

WHAT YOU'LL PRACTICE

- Triads: identify and name chords from their notes, build them from scratch note by note
- Intervals: name the distance between any two notes, find notes by interval
- Scales: major, natural minor, and harmonic minor - identify and construct them
- Staff Reading: treble and bass clef note recognition
- Build-a-Chord: pick the 3rd, then the 5th - construct chords step by step
- Build-a-Scale: identify individual scale degrees by ear and by formula

FOR PLAYERS OF ANY LEVEL

New to theory? Start with Fundamentals - seven short quiz-based lessons covering the musical alphabet, semitones, intervals, chords, and scales from the ground up.

Already know the basics? Jump straight into drills. Filter by chord type, inversion, scale type, and question style. The compact sidebar keeps your settings visible while you practice.

TRACK YOUR PROGRESS

Accuracy percentages, streaks, and best streaks for every category. Six achievements to earn. Your stats persist across sessions.

Completely free. No ads. No subscriptions. No account required.