Scale Theory
Internalize music theory.
Only for iPhone
$1.99 · Designed for iPhone. Not verified for macOS.
iPhone
You know the theory. You just have to look it up.
Scale Theory is a drill tool for musicians who want faster, more reliable recall — key signatures, diatonic harmony, modes, chord functions, and relative minor relationships. Not slower. Not effortful. Just known.
What you'll learn:
• Key signatures: sharps, flats, and which notes they are, in both directions
• Relative minor keys, quizzed both ways
• Diatonic triads and seventh chords in every major key — names, qualities, and notes
• All seven modes: names, interval formulas, and characteristic chords
• Chord functions: identify and spell the dominant seventh and half-diminished chord in any key
How it works:
Each topic follows a review-then-quiz loop. New items are revealed one piece at a time, so you're predicting the next step before it appears. After every few new items, a recap quiz covers everything learned so far — not just what's recent. A randomized Practice mode presents questions in mixed formats across all keys, with upcoming answers hidden so you can't read ahead.
Key signatures follow circle-of-fifths order, which is how keys actually relate to each other.
Who it's for:
• Players who want to think faster when improvising or reading charts.
• Anyone whose theory knowledge lives in their head in a slow, effortful way.
• Students prepping for graded exams.
This is a drill tool, not a lesson. It assumes you've encountered these concepts — it's here to make them automatic.
Ratings & Reviews
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The developer, YellowDress, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Gabriel Koen
- Size
- 19.4 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Gabriel Koen
