# Music Theory Companion

> Music theory, scales, chords, ear training & songwriting tool for all musicians

Canonical page: [https://chrome-stats.com/d/app.pg.scalechordprogression](https://chrome-stats.com/d/app.pg.scalechordprogression)

## Overview

- **ID:** `app.pg.scalechordprogression`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** PG App Studio
- **Category:** MUSIC\_AND\_AUDIO
- **Downloads:** 683,721
- **Rating:** 4.40 / 5 (2,549 ratings)
- **Version:** 9.0.1
- **Last updated:** 2026-08-17
- **First published:** 2018-05-23
- **Publisher country:** IN
- **Size:** 14 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=app.pg.scalechordprogression)
- **Website:** [https://www.pgappstudio.com](https://www.pgappstudio.com/)
- **Privacy policy:** [http://www.pgappstudio.com/p/privacy-policy.html](http://www.pgappstudio.com/p/privacy-policy.html)

## Description

Music Theory Companion is a comprehensive toolbox for musicians of all levels—songwriters, students, teachers, and performers. It offers 86 heptatonic scales and their diatonic triads/seventh chords, a 1,000+ chord library, circle of fifths visualizations, pitch detection, realistic piano keyboard and guitar fretboard displays, a configurable metronome, interval and ear-training exercises, and advanced voice-leading tools (Cube Dance). The app supports sharp and flat roots, shows compatible scales and chords, displays notation in treble and bass clefs, and provides analytical labels like Secondary Dominant and Secondary Leading-Tone.

Designed for practice, composition, and study, Music Theory Companion helps with improvisation, modulation, sight reading, vocal training and chord progression exploration. Its intuitive UI and continuously updated reference materials make it a practical music theory book and practice partner—ideal for pianists, guitarists, composers, exam students, and anyone wanting to improve relative pitch and musical understanding. Community support and resources are available via the developer website, Facebook page and YouTube channel.

## Rankings

- #84,402 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_ADSERVICES_TOPICS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.MODIFY_AUDIO_SETTINGS`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.READ_BASIC_PHONE_STATE`
- `android.permission.RECORD_AUDIO`
- `android.permission.WAKE_LOCK`
- `app.pg.scalechordprogression.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `com.android.vending.BILLING`
- `com.google.android.c2dm.permission.RECEIVE`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.google.android.gms.permission.AD_ID`

## Review summary

Music Theory Companion offers a free, offline, and feature-rich toolkit (circle of fifths, chords, a built-in keyboard with recording) that’s great for learning theory and practicing. However, reviews frequently cite intrusive ads, occasional audio malfunctions, and missing MIDI support, plus less-friendly long-form chord notation, which can hinder usability.

### Pros

- Free to use and available on Android
- Comprehensive feature set (circle of fifths, chords, built-in keyboard with chords, recording)
- Helpful for learning theory and practice (sight-reading, playing along with songs)
- Realistic piano sound and playable keyboard
- Offline access/usage

### Cons

- Intrusive, loud, full-screen ads that disrupt usage
- Core audio issues (no sound or metronome silent)
- Lack of MIDI connectivity support
- Chord notation uses long-form symbols (e.g., Csus4##5) which can be cumbersome
- Battery drain/energy usage

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