# SUS4 Scale Lab — Every scale. Every instrument.

> Every scale. Every instrument. (iPhone/iPad app by ThePaulSmith.)

- Source: https://appshunter.io/ios/app/sus4-scale-lab/id6777229932 (this page in markdown: same URL + `.md`)
- Developer: [ThePaulSmith](https://appshunter.io/developer/319584506)
- Category: Music, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.0 · 19 MB
- Languages: American English
- Released: 2026-06-16
- Data updated: 2026-07-24
- User reviews in markdown: https://appshunter.io/ios/app/sus4-scale-lab/id6777229932/reviews.md

## What is SUS4 Scale Lab?

Every scale, every mode, every instrument.

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 — 150+ 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: 150+ catalog scales, 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.

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| SUS4 Scale Lab Pro Monthly | $0.99 | per month |
| SUS4 All-Access | $4.99 | per month |



## Version history (last 3 releases)

### 1.1.0 — 2026-07-02

Every advertised feature is now fully functional, Pro genuinely unlocks real features, and the new SUS4 All-Access pass unlocks all 24 SUS4 apps with a 7-day free trial. Faster and clearer throughout.

### 1.0.2 — 2026-06-22

Reliability and performance improvements throughout the app.

### 1.0 — 2026-06-16

No release notes.

## More apps by ThePaulSmith

- [iScrobble Pick And Mix](https://appshunter.io/ios/app/iscrobble-pick-and-mix/id319584503)
- [iSwipeMusic](https://appshunter.io/ios/app/iswipemusic/id334689181)
- [iShuffleAlbums](https://appshunter.io/ios/app/ishufflealbums/id335009718)
- [iBreathalyzer](https://appshunter.io/ios/app/ibreathalyzer/id369686249)
- [SUS4 Pitch Pipe](https://appshunter.io/ios/app/sus4-pitch-pipe/id6777229584)
- [SUS4 Chord ID](https://appshunter.io/ios/app/sus4-chord-id/id6777229621)

All apps by ThePaulSmith: https://appshunter.io/developer/319584506

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-24.*