Comparison

Quinterval vs Byell Harmony

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

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.

Highlights
  • Chord and scale lookup
  • Musical context exploration
  • Note relationship analysis
  • MIDI keyboard input display
  • Sequencer for preset changes
  • MIDI data transfer
Features
Read full description

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

Quinterval3 screens
Byell Harmony4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Quinterval sells 1 one-off in-app purchase. Byell Harmony asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Quinterval versus Byell Harmony: the parameters behind the verdict, then further details
ParameterQuintervalByell Harmony
PriceFreeFree
Rating4.3 (20 ratings) — better3.3 (3 ratings)
Positive reviews78.2% of reviews — better58.3% of reviews
Number of ratings20 — better3
Update frequencyEvery 8 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.66.0 — better
Further details — not scored
Size43 MB24 MB
Age rating4+4+
DeveloperOliver HahnGarzotto GmbH

Customer experience

Quinterval

All ratings20 ratings
Positive85.0%
Neutral5.0%
Negative10.0%
Written reviews87 reviews
Positive78.2%
Neutral11.5%
Negative10.3%

Byell Harmony

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews12 reviews
Positive58.3%
Neutral8.3%
Negative33.3%

In-app purchases

1 purchases

Quinterval

One-time1
  • Enhanced Version$0.99
None

Byell Harmony

No in-app purchases

Questions

Is Quinterval free?
Quinterval is free to download, with in-app purchases available.
Is Byell Harmony free?
Byell Harmony is free to download, with no in-app purchases.
Which has better reviews, Quinterval or Byell Harmony?
Quinterval is rated higher. Quinterval averages 4.3 out of 5 from 20 ratings, while Byell Harmony averages 3.3 from 3 ratings.
Do Quinterval or Byell Harmony have ads?
Neither Quinterval nor Byell Harmony shows ads.
Which is updated more often, Quinterval or Byell Harmony?
Quinterval ships an update every 8 months, and Byell Harmony every 2 months. Most recently, Quinterval was updated on September 18, 2026 and Byell Harmony on September 15, 2026.

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