Invest in your music theory

All 24 keys are always free. Pro unlocks advanced techniques — inversions, chromatic harmony, Neapolitan chords, and more. Start with a 30-day free trial — no payment required.

MonthlyYearly

Free

All 24 keys. All core modes. Always free.

$0/month

Free forever

All 24 keys — always free
Triads, 7th Chords, V7 practice
Secondary Dominants & Borrowed Chords
Key Signature identification (mixed mode)
Cadence & Harmonic Function practice
Suspended Chords
50 questions per day
Stats — last 7 days
Session streak counter
Ads supported
Advanced techniques: Inversions (1st, 2nd, 3rd)
Neapolitan Sixth & Augmented Sixth chords
Secondary Leading-Tone chords
Mixed mode — all types & inversions combined
Advanced Key Sig modes (bidirectional drill)
Timed Exam mode — simulate real proficiency tests
Unlimited daily questions
Full analytics — 30 day history
Response time breakdown by key & chord type
No ads — pure focus
Progress export
Priority access to new features

Pro

30-day free trial

Unlock advanced techniques. Pass exams.

$7.99/month

Billed monthly · cancel anytime

All 24 keys — always free
Triads, 7th Chords, V7 practice
Secondary Dominants & Borrowed Chords
Key Signature identification (mixed mode)
Cadence & Harmonic Function practice
Suspended Chords
50 questions per day
Stats — last 7 days
Session streak counter
Ads supported
Advanced techniques: Inversions (1st, 2nd, 3rd)
Neapolitan Sixth & Augmented Sixth chords
Secondary Leading-Tone chords
Mixed mode — all types & inversions combined
Advanced Key Sig modes (bidirectional drill)
Timed Exam mode — simulate real proficiency tests
Unlimited daily questions
Full analytics — 30 day history
Response time breakdown by key & chord type
No ads — pure focus
Progress export
Priority access to new features

Frequently asked questions

Still unsure about Pro?

Support the project instead

Help keep ZodiacTheoryLearn free for students everywhere. Support development for as little as $3/month — no subscription required.