# SUS4 Scale Lab

> Every scale. Every instrument.

Canonical page: [https://chrome-stats.com/d/id6777229932](https://chrome-stats.com/d/id6777229932)

## Overview

- **ID:** `id6777229932`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** ThePaulSmith
- **Category:** Music
- **Version:** 1.1.1
- **Last updated:** 2026-08-27
- **First published:** 2026-06-16
- **Size:** 19 MB
- **Data as of:** 2026-09-18
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/sus4-scale-lab/id6777229932)
- **Website:** [https://4chords.studio](https://4chords.studio/)
- **Privacy policy:** [https://4chords.studio/privacy](https://4chords.studio/privacy)

## Description

Every scale on guitar and piano — 104 scales in the catalog. Free to explore, unlock for the full library.

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.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Rankings

- #2,120,572 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6777229932)