Music Theory Companion

Music Theory Companion icon

Music Theory Companion

PG App Studio

4.5

2K ratings

500,000+

downloads

Free

+ in-app

In this app, you can explore scales, chords, and voice leading tools to enhance your musical skills. Use this app to practice scales, identify intervals, and visualize the circle of fifths. Includes a chord library, pitch detector, metronome, and interactive instrument simulations.

AppRecs review analysis

AppRecs rating 4.0. Trustworthiness 81 out of 100. Review manipulation risk 26 out of 100. Based on a review sample analyzed.

★★★★

4.0

AppRecs Rating

Ratings breakdown

5 star

82%

4 star

4%

3 star

5%

2 star

1%

1 star

9%

What to know

Low review manipulation risk

26% review manipulation risk

Credible reviews

81% trustworthiness score from analyzed reviews

Ad complaints

Many low ratings mention excessive ads

About Music Theory Companion

Unlock your musical potential with the Music Theory Companion app! This comprehensive tool is designed for musicians of all levels, from beginners to experienced composers. Whether you're into songwriting, music theory study, or want to improve your playing, this app is a goldmine. This app helps you develop your aural skills and relative pitch. It can help with improvisation, composition, arrangement, and interpretation.


🌟 KEY FEATURES:
✅ Scales & Chords: Explore 86 unique heptatonic scales/modes and their diatonic triads/seventh-chord formations. The app has a wide list of scales for guitar, piano and vocal.
✅ Matching Chords: Discover alternative chords for any note in any scale.
✅ Matching Scales: Find alternative scales that can be played with any given scale.
✅ Circle of Fifths: Visualize the circle of fifths for all 86 scales, with options for triads and seventh chords. The circle of fifths tool can be used for finding chord progressions. The app supports both clockwise and anticlockwise directions for the circle of fifths.
✅ Voice Leading: Use the Cube Dance tool for voice leading guidance based on Neo-Riemannian theory.
✅ Chord Library Access a library of 1000+ chords, with chord construction details. This can be used as a chord finder.
✅ Modulations: Explore various chord progression options for smooth key changes.
✅ Scale Practice: Use the pitch detector to practice scales on guitar, piano, or vocals. This app can also be used for vocal training and helps with ear tuning.
✅ Intervals: Train your ear with interval exercises in all keys.
✅ Metronome: Practice with a highly accurate metronome that has configurable sounds. The metronome can be used with guitar, drum set, piano, and vocal practices.
✅ Piano: A realistic piano keyboard with different instrument sounds. This can be used as a piano chords learning app.
✅ Guitar Fretboard: Realistic left-handed and right-handed guitar fretboard display. The app is also a guitar chords app.
✅ Musical Symbols: Quick online reference for musical symbols.
✅ Music Theory Reference: Access a vast collection of online music theory resources, making it a great free music theory book.
✅ Supports both sharp (#) and flat (b) notes for root.
✅ Play guitar chords or piano chords in sync with the metronome ticks.
✅ Has a simple and easy-to-use user interface.
✅ Provides analytical labels such as Secondary Dominant and Secondary Leading-Tone.
✅ Shows compatible scales' chords.
✅ Displays similar and relative scales.
✅ Shows common degrees: Tonic, Supertonic, Mediant, Subdominant, Dominant, Submediant, Leading tone (in Major scale) / Subtonic (in Natural Minor Scale)
✅ Displays compatible chords' scales.
✅ Shows chords and scales on the staff with treble and bass clef.


🎯 APP USAGE:
This app is a complete toolbox for musicians and can be used for:
✅ Music Composing
✅ Music Theory Study
✅ Chord Progressions
✅ Modulation and Key Change
✅ Voice Leading
✅ Guitar and Piano Chord Practice
✅ Vocal Training
✅ Ear Training
✅ Sight reading

🎼 Designed for:
🎹 Pianists & keyboard players
🎶 Musicians, composers, and songwriters
🧠 Music theory learners & teachers
🎓 Students preparing for music exams
🎧 Anyone who loves creating music

The Music Theory Companion app has a realistic piano keyboard and guitar fretboard. It also has a pitch detector.
This app is continuously updated and improved.


COMMUNITY

Follow us on Facebook
https://www.facebook.com/MusicCompanionApp/

Join Our Facebook Group
https://www.facebook.com/groups/MusicCompanionGroup/

Visit Our Website
https://www.pgappstudio.com

Check our YouTube Channel
https://www.youtube.com/@PGAppStudio

Contact Customer Support
pgappstudio@gmail.com
Music Theory Companion Screenshots
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Reviews for Music Theory Companion

Christine Cameron

12/9/2025

great app... sound of piano ,very realistic

Jonathan Morris

12/8/2025

Stunning, comprehensive app. There is so much in this. Not just for learning theory but also for creative moments without jumping to the computer and getting bogged down with the DAW.

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