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
🌟 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.