Music Theory Decoder Downloads & RevenueMusic Theory Decoder · App Store
Not in any tracked top chart right now.
Updated 8 Nov 2026 · rankings refresh through the day
DeveloperTomi Nevalainen
CategoryMusic
Price4.99 EUR
Released
Rating★ 0.0 (0)
Version1.0
Age rating4+
First seen by us
11 Oct 2026
11 Oct 2026📈Dropped out of every chart we track🆕First spotted by AppInsider📦Version 1.0🆕Released on the App Store
Full timeline · 4 events
- 📈Music Theory Decoder dropped out of every chart we trackLast seen 11 Oct
- 🆕Music Theory Decoder first spotted by AppInsider#18 in Top Paid · Music · Germany
- 📦Music Theory Decoder version 1.0No release notes
- 🆕Music Theory Decoder released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
0.0 ★
0 ratings
Measured
Music Theory Decoder on the App Store
App details
App ID
6763486860
Publisher
Tomi Nevalainen
On the store since
May 2026
Under a year
Minimum OS
iOS 16.6+
iPhone 8 and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
41 MB
Also listed in
Education
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
0.0 ★
0 ratings
Measured
Ratings
0
Measured
About Music Theory Decoder
Stop juggling five different apps and theory books. Music Theory Decoder combines a complete music theory guide — 18 in-depth lessons with interactive examples — with the practical tools you actually need: chord finder, scale library, tuner, metronome, drone, and vocal practice.
Built around an interactive Circle of Fifths, every theory concept links directly to the chords, scales, and progressions where you'll use it. Hear it. See it. Understand it.
— WHAT'S INSIDE —
◆ DECODER
The interactive Circle of Fifths at the heart of the app. Tap any key to see its diatonic chords (I, IV, V, ii, iii, vi, vii°) laid out clearly. Flip the card to access 12 classic chord progressions — Pop Classic, Four Chords, 50s Doo-Wop, Jazz ii–V–I, 12-Bar Blues, Pachelbel, Andalusian Cadence and more — auto-transposed to your chosen key. Hit play, pick a tempo (60–120 BPM), and hear them with the playing chord highlighted in real time.
◆ SCALES
20 scales across five categories: Modes (Ionian through Locrian), Minor (natural, harmonic, melodic, pentatonic), World (blues, flamenco), Japan (Hirajoshi, Insen, Yo), and Middle East (Phrygian Dominant, Double Harmonic, Hijaz). Every scale shows notes on guitar fretboard and piano keyboard, with audio preview up and down.
◆ CHORDS
30 chord types across all 12 roots — triads, 7ths, 6ths, altered dominants, extended 9/11/13 voicings. Multiple guitar fingerings per chord. Every interval labeled so you understand what you're playing.
◆ INTERACTIVE THEORY GUIDE
18 in-depth lessons covering everything from intervals to extended chords: Intervals, Scales, Three Minor Scales, Circle of Fifths, Chord Construction, Diatonic Chords, Chord Functions, Progressions, Cadences, Voice Leading, Secondary Dominants, Borrowed Chords, Modal Chords, Extended & Altered Chords, Guitar Theory, Piano Theory and more. Each lesson includes interactive staff notation, real examples, and direct links to the Circle of Fifths, scales, and chords where the theory actually lives. Theory you don't just read — you hear and play.
◆ TOOLS (7 professional utilities)
• Tuner — Chromatic, accurate, with smooth spring animations
• Metronome — Compound time (6/8, 9/8, 12/8), swing slider, beat accents, tap tempo, four click sounds
• Drone — Continuous reference pitch for practice and improvisation. Four waveforms, three octaves
• Free Sing — Real-time pitch monitor for singers. See every note you sing with cent-accurate tuning feedback
• Vocal Warm-Up — Breathing coach + scale exercises with real-time pitch tracking
• Capo Calculator — Instantly find capo position for any key
• Transpose — Move any chord progression to any key
— WHY MUSIC THEORY DECODER —
◆ All-in-one. Replace your tuner app, metronome app, theory book, chord library, and vocal tools with one unified experience.
◆ Built for real musicians. Dark theme, bold typography, professional design. Not a cartoon learning app — a working tool.
◆ Vocalists included. Free Sing, Vocal Warm-Up, and Drone
Built around an interactive Circle of Fifths, every theory concept links directly to the chords, scales, and progressions where you'll use it. Hear it. See it. Understand it.
— WHAT'S INSIDE —
◆ DECODER
The interactive Circle of Fifths at the heart of the app. Tap any key to see its diatonic chords (I, IV, V, ii, iii, vi, vii°) laid out clearly. Flip the card to access 12 classic chord progressions — Pop Classic, Four Chords, 50s Doo-Wop, Jazz ii–V–I, 12-Bar Blues, Pachelbel, Andalusian Cadence and more — auto-transposed to your chosen key. Hit play, pick a tempo (60–120 BPM), and hear them with the playing chord highlighted in real time.
◆ SCALES
20 scales across five categories: Modes (Ionian through Locrian), Minor (natural, harmonic, melodic, pentatonic), World (blues, flamenco), Japan (Hirajoshi, Insen, Yo), and Middle East (Phrygian Dominant, Double Harmonic, Hijaz). Every scale shows notes on guitar fretboard and piano keyboard, with audio preview up and down.
◆ CHORDS
30 chord types across all 12 roots — triads, 7ths, 6ths, altered dominants, extended 9/11/13 voicings. Multiple guitar fingerings per chord. Every interval labeled so you understand what you're playing.
◆ INTERACTIVE THEORY GUIDE
18 in-depth lessons covering everything from intervals to extended chords: Intervals, Scales, Three Minor Scales, Circle of Fifths, Chord Construction, Diatonic Chords, Chord Functions, Progressions, Cadences, Voice Leading, Secondary Dominants, Borrowed Chords, Modal Chords, Extended & Altered Chords, Guitar Theory, Piano Theory and more. Each lesson includes interactive staff notation, real examples, and direct links to the Circle of Fifths, scales, and chords where the theory actually lives. Theory you don't just read — you hear and play.
◆ TOOLS (7 professional utilities)
• Tuner — Chromatic, accurate, with smooth spring animations
• Metronome — Compound time (6/8, 9/8, 12/8), swing slider, beat accents, tap tempo, four click sounds
• Drone — Continuous reference pitch for practice and improvisation. Four waveforms, three octaves
• Free Sing — Real-time pitch monitor for singers. See every note you sing with cent-accurate tuning feedback
• Vocal Warm-Up — Breathing coach + scale exercises with real-time pitch tracking
• Capo Calculator — Instantly find capo position for any key
• Transpose — Move any chord progression to any key
— WHY MUSIC THEORY DECODER —
◆ All-in-one. Replace your tuner app, metronome app, theory book, chord library, and vocal tools with one unified experience.
◆ Built for real musicians. Dark theme, bold typography, professional design. Not a cartoon learning app — a working tool.
◆ Vocalists included. Free Sing, Vocal Warm-Up, and Drone
Latest updates
1.0
