# Quinterval vs D1 Coach

The clearest difference is update cadence: D1 Coach at fortnightly against Quinterval's every 8 months. D1 Coach also leads on iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Quinterval sells 1 one-off in-app purchase and D1 Coach sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Quinterval ships an update every 8 months, D1 Coach fortnightly. The most recent releases landed on September 18, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Quinterval | D1 Coach |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (20 ratings)](https://appshunter.io/ios/app/quinterval/id373810100/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 78.2% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 43 MB | 58 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oliver Hahn](https://appshunter.io/developer/324458008) | [Bayerischer Blasmusikverband e.V.](https://appshunter.io/developer/1485208319) |

## 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 |


### D1 Coach

[App page](https://appshunter.io/ios/app/d1-coach/id1476317669)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vollversion | $8.99 | one-time |


## Frequently asked questions

### Is Quinterval free?

Quinterval is free to download, with in-app purchases available.

### Is D1 Coach free?

D1 Coach is free to download, with in-app purchases available.

### Do Quinterval or D1 Coach have ads?

Neither Quinterval nor D1 Coach shows ads.

### Which is updated more often, Quinterval or D1 Coach?

Quinterval ships an update every 8 months, and D1 Coach fortnightly. Most recently, Quinterval was updated on September 18, 2026 and D1 Coach on September 21, 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.*