SUS4 Scale Lab: Guitar Scales
Modes on fretboard, piano
Free · In-App Purchases
Learning Dorian for a solo, or checking which notes fit over a chord. See the shape across the neck, hear each note, and try a Scale Hunter round.
Every common scale and mode, on guitar and piano.
Guitar scales and modes shown on a fretboard and on a piano keyboard.
104 scales across 15 categories, each playable so you hear it as well as see it.
Scale Lab is the reference you keep open during practice when you are learning a new mode, checking what notes belong to a harmonic minor in B, or visualising a Dorian scale across the guitar neck. It covers every standard scale and mode — 104 entries across 15 categories — displayed on guitar fretboard and piano keyboard.
Switch root notes and scale types instantly. Scale positions light up across the neck. The app does not lecture; it shows you the information and gets out of the way.
• Every common scale and mode: major, minor, pentatonic, modal, and more
• Guitar fretboard view with scale positions across the neck
• Piano keyboard view with scale notes highlighted
• Switch root note and scale type instantly
• Unlock: the full 104-scale catalog, Theory cards, Mode Comparison, Practice Loop
No account. No mic. Runs fully on-device. Free to explore — monthly subscription or one-time unlock for the full catalog.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Lifetime purchase option and reliability improvements.
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
- Provider
- Paul Smith
- Size
- 21 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
- 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