Quinterval vs Byell Harmony
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Quinterval
Explore the circle of fifths with interactive scale displays. Select keys via touch or slider to view major and parallel minor scales. Customize note notation and clef for a personalized musical experience.
- Interactive circle of fifths
- Major and parallel minor scale display
- Adjustable display range
- Customizable note notation (German, English, Italian)
- Clef selection (G, C, F)
- Key signature display
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Quinterval is an interactive circle of fifths including the display of the corresponding scales. A key in the circle can be selected either by touching the tonic or by turning the slider in the middle. The circle displays both the respective major and parallel minor scales. The display ranges from F-flat major (D-flat minor) to G-sharp major (E-sharp minor). A second slider can be used to move the visible circle section accordingly. The note names can be set between german, english or italian notation. The lower area shows the related major scale with its key signature. The first step and the sixth step with the corresponding minor scale are highlighted. The notes can be displayed with G-Clef, C-Clef or F-Clef. The accidentals can also be displayed before the individual notes. Additional functionality is available as an InApp purchase: - Display the notes of the parallel minor scale - Display triads with their chord names - Playback notes by tapping on them
Byell Harmony
This app helps musicians learn, identify, and explore musical chords, scales, and contexts. It answers questions about note relationships, chord names, and scale variations, with MIDI interaction capabilities.
- Chord and scale lookup
- Musical context exploration
- Note relationship analysis
- MIDI keyboard input display
- Sequencer for preset changes
- MIDI data transfer
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Byell Harmony is a practice-oriented tool for learning, listening to, and looking up chords, scales and musical contexts. Questions such as the following, can be answered easily: * Which notes on the guitar belong to the G Minor Blues Scale? * Where can I find notes on the violin, which can accompany the D-minor? * Which notes change when I change from C major to G major? * What can I play on the guitar when certain notes are given? * What is the name of the chord when you have the notes E, G and C * What scale is obtained if you replace the minor third with the major third in harmonic minor? * In the melody of a Song, you find e.g. the note A and D. To which chord might they belong? * How does the fingering on the violin move between G dorian and G phrygian? Which note on a cello corresponds * to which note on a guitar? * What scale is obtained if you use only the black keys on the piano? * How do I find a B° chord on the guitar? * What note must be played on a Eb tuned instrument to get the note C? and much more... Also you can interact with MIDI * Notes played on a Midi-Keyboard are shown on the display. * A sequencer can be used to change presets. * The current setting (root notes, scale, mode, marked notes) can be transferred via MIDI to another device with Byell Harmony. * Marked notes can be played to a connected MIDI device. * A song or chord progression can be defined and sent to all devices with Byell Harmony.
Screenshots
Verdict
The clearest difference is rating: Quinterval at 4.3 against Byell Harmony's 3.3. Quinterval also leads on review sentiment (78% vs 58%) and ratings volume (20 vs 3). Byell Harmony's advantage is in-app purchases (none vs 1) and update cadence (every 2 months vs every 8 months). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Quinterval sells 1 one-off in-app purchase. Byell Harmony asks for nothing beyond the download.
Quinterval holds the better App Store score, 4.3 against 3.3. That said, the two scores are not equally well evidenced: Quinterval has 20 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 78% of Quinterval's written reviews are positive against 58% of Byell Harmony's.
Quinterval ships an update every 8 months, Byell Harmony every 2 months. The most recent releases landed on September 18, 2026 and September 15, 2026 respectively.
| Parameter | Quinterval | Byell Harmony |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (20 ratings) — better | 3.3 (3 ratings) |
| Positive reviews | 78.2% of reviews — better | 58.3% of reviews |
| Number of ratings | 20 — better | 3 |
| Update frequency | Every 8 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 6.0 — better |
| Further details — not scored | ||
| Size | 43 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Oliver Hahn | Garzotto GmbH |
Customer experience
Quinterval
Byell Harmony
In-app purchases
Quinterval
- Enhanced Version$0.99
Byell Harmony
No in-app purchases
Questions
Is Quinterval free?
Is Byell Harmony free?
Which has better reviews, Quinterval or Byell Harmony?
Do Quinterval or Byell Harmony have ads?
Which is updated more often, Quinterval or Byell Harmony?
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