# Quinterval vs Byell Harmony

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.

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.

## The numbers

| Metric | Quinterval | Byell Harmony |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (20 ratings)](https://appshunter.io/ios/app/quinterval/id373810100/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/byell-harmony/id440147722/reviews) |
| Number of ratings | **20** | 3 |
| Positive reviews | **78.2% of reviews** | 58.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 43 MB | 24 MB |
| Requires iOS | 15.6 | **6.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oliver Hahn](https://appshunter.io/developer/324458008) | [Garzotto GmbH](https://appshunter.io/developer/291676871) |

## What reviewers say

### Quinterval

[App page](https://appshunter.io/ios/app/quinterval/id373810100)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Enhanced Version | $0.99 | one-time |


### Byell Harmony

[App page](https://appshunter.io/ios/app/byell-harmony/id440147722)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*