Piano Scales Modes Chord Book
Music Theory Ear Trainer Keys
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Every scale and mode in all 12 keys — lit up on a playable piano, with the chords that fit and an ear trainer to lock the sound in. Fully offline.
Look up any scale or mode, in any of the twelve keys, and actually hear it played on a keyboard you can tap.
Most theory apps hand you a static chart and leave you to imagine the sound. ScaleBook shows the scale lit up across a two-octave piano, spells every note with the correct sharps or flats, plays it back ascending or descending, and then builds the diatonic chords that go with it — so the shape, the name and the sound land at the same time.
WHAT YOU GET
- 18 scales and modes across six families — major, minor, pentatonic, blues, the seven modes and exotic scales — in all 12 keys
- A two-octave piano keyboard that highlights the scale and plays any note you tap
- One-tap playback of the whole scale, ascending or descending, with the notes lighting up in time
- Diatonic triads for every seven-note scale, with Roman numerals and tap-to-hear chords
- An interactive circle of fifths plus a full interval table, so key signatures stop being guesswork
- An ear trainer that plays a mystery scale from a random root and tracks your streak, best run and rounds played
PERFECT FOR
- Piano and keyboard players learning scales beyond major and minor
- Songwriters hunting for the right mode or colour for a progression
- Music students revising intervals, key signatures and the circle of fifths
- Anyone training their ear to tell Dorian from natural minor by sound alone
WHY NOT JUST SEARCH IT ONLINE?
A search gives you a picture of C Lydian. It does not play it, it does not transpose it to Eb, it does not tell you which chords fit, and it does not work on a stage, on a train or anywhere the signal drops. ScaleBook is fully offline — every scale, every playback tone and every lesson is generated on your device, with no account and no ads.
PRIVACY
No account, no sign-up, no tracking. Your favourites, ear-trainer stats and tuning settings live only on your iPhone.
FULL ACCESS
Full access unlocks the complete library — melodic minor, Phrygian, Lydian, Mixolydian, Locrian, whole tone, diminished, Phrygian dominant, Hirajoshi, Hungarian minor and major blues — plus diatonic chord building and the ear trainer. Choose weekly, yearly, or a one-time lifetime purchase.
Pick a root note, tap play, and hear what a mode really sounds like.
Terms of Use (EULA): https://web-levi.web.app/terms
Privacy Policy: https://web-levi.web.app/privacy-policy
Questions? tphuc.work@gmail.com
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Bug fixes and performance improvements.
Subscriptions
In-App Purchases
The developer, Phuc Pham, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
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Information
- Seller
- Phuc Pham
- Size
- 6.1 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+
- In-App Purchases
Yes
- Music Theory Pass, Pay Once $29.99
- Pentatonic & Blues, Yearly $14.99
- Fretboard Trainer, Weekly $2.99
- Copyright
- © 2026 Phuc Pham