SUS4 Scale Lab: Guitar Scales
104 scales on fretboard, piano
Free · In‑App Purchases
104 scales and modes on a guitar fretboard and a piano keyboard. Pick a root and a scale, see every position, tap a note to hear it.
Pick a root and a scale and see every note on the fretboard and the keyboard at once.
104 scales and modes in 15 categories, from the pentatonic to ragas.
Fully on-device: no cloud, no account.
Choose the tonic and the scale type; the fretboard (standard tuning) and a two-octave piano light up. Tap a note to hear it, read the scale degrees and the diatonic chords, and try the Scale Hunter challenges.
• 104 scales and modes: major, minor, pentatonic, modal, jazz, world and more
• Guitar fretboard and piano keyboard views
• Scale degrees and diatonic chords
• Theory cards and mode comparison
• Scale patterns with tab export
• Scale Hunter challenges
For guitarists learning modes, pianists checking a scale, and improvisers who want to see where the notes are.
Everyone can browse the whole catalog and play three scales a day. Pro, or SUS4 All-Access across the whole range, removes the daily limit on playback.
Made in the UK by working musicians.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
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SUS4 now speaks your language: the app is available in 50 languages.
Any lifetime purchase now unlocks every SUS4 app.
A clearer upgrade screen, plus fixes and polish throughout.
The developer, ThePaulSmith, 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
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Paul Smith
- Size
- 30.2 MB
- Category
- Music
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 43 more
- English, Arabic, Bengali, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Malay, Malayalam, Marathi, Norwegian Bokmål, Oriya, Polish, Portuguese, Punjabi, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Tamil, Telugu, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SUS4 Scale Lab Lifetime $59.99
- SUS4 All-Access $4.99
- SUS4 Scale Lab Pro Monthly $0.99
- Copyright
- © 2026 4chords Studios