# Quinterval — Circle of Fifths with Scales

> Interactive circle of fifths with major and minor scale displays. (iPhone/iPad app by Oliver Hahn.)

- Source: https://appshunter.io/ios/app/quinterval/id373810100 (this page in markdown: same URL + `.md`)
- Developer: [Oliver Hahn](https://appshunter.io/developer/324458008)
- Category: Music, Education
- Price: Free with in-app purchases
- Rating: 4.30/5 from 20 App Store ratings · 87 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 43 MB
- Languages: American English, French (France), German (Germany), European Spanish
- Released: 2010-05-26
- Data updated: 2026-08-25
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/quinterval/id373810100/reviews.md

## What is Quinterval?

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

## Key features

- 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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## Recent user reviews (10 of 87)

All indexed reviews: https://appshunter.io/ios/app/quinterval/id373810100/reviews.md

### 5/5 — 5/5

*2025-02-16, version 2.3*

Very helpfull

### 4/5 — Super, mit einer kleinen Einschränkung

*2025-02-16, version 2.3*

Die App ist super, die Benutzung klar und einfach und sie tut genau, was sie soll. Ich habe mir gleich die Pro-Version gekauft, für den Preis was das ein No-Brainer und ich unterstütze die Entwickler gern damit. 
Das einzige Manko, das ich gefunden habe: Um Töne abzuspielen, muss ich den Stummmodus ausschalten. Das klingt erstmal logisch, ist aber völlig sinnlos. 
Der Stummmodus ist dazu da, alle möglichen Klingeltöne auszuschalten, damit man sich besser auf das konzentrieren kann, was man gerade tun möchte - zum Beispiel Töne in dieser App abzuspielen. Jetzt muss ich entweder in Kauf nehmen, dass jede Nachricht einen Ton von sich gibt, oder darauf verzichten, die Töne abzuspielen.

### 1/5 — Missing C Maj sharp & flat

*2023-06-18, version 2.1*

I wanted to use this to quickly see diatonic Chords .  Please include the traditional Roman Numerals to the degree scale at the bottom . Please add Cflat Maj with its 7 flats .  Please add Csharp Maj with its 7 sharps, even though it is rarely used.

### 5/5 — Great app!

*2023-02-22, version 2.1*

This is a great app, with clean UI, and good pricing for the full version. My only gripes are that you can’t do both options for accidentals placing(which could be solved by either making both options checkboxes, or adding a third option that is just “Both”), you can’t have multiple octave scales (which could be a box with the current number of octaves in the scale, and +/- buttons on either side. The scale could automatically resize itself to fit), and the lack of arpegios (which could just highlight the notes in the current scale with a different color if they are in the arpegio.) Thank you for reading my review, and I understand if difficult to implement features like multiple octave scales aren’t added, but simpler things would like my first and last idea would be greatly appreciated.

### 5/5 — Simple and easy to use

*2022-10-04, version 2.1*

This is exactly what I needed! I was looking for an app to help me learn key signatures as well as practice doing scales on my violin. Would be nice to be able to change the fingering numbers for other instruments, but overall a minor thing since the app runs so well and is easy to use.

### 5/5 — Top!

*2022-08-02, version 2.1*

Sehr schön gestaltete App und sehr hilfreich!

### 5/5 — Fabulous tool

*2021-04-25, version 2.1*

I have used this app for a long time. It’s always been my go to source for scale revision on the go. This current version helps me even more now it includes the minor scale notes and the triads. Well done sir!

### 5/5 — Love the app

*2020-11-04, version 2.1*

This is a great teaching tool.
Looking for access to have arpeggios, extensions, inversions, the basis is there.
It’d be a total theory app then!!
Thank you.

### 5/5 — Perfect!

*2020-08-26, version 2.0.2*

This is exactly what I need. I have the option to view the bass clef and see all the notes including the Nashville number system. It’s so handy. Thanks for this app. Love it

### 5/5 — ...

*2020-07-21, version 2.0*

Ihr habt die Tonleitern mit sieben kreuzen und sieben b's vergessen. Ist schon wichtig!

You forgot the scales with seven sharps and flats. They are important though.

## Frequently asked questions about Quinterval

### What does Quinterval do?

Quinterval is an interactive tool that displays the circle of fifths and corresponding major and parallel minor scales. You can select keys by touching the tonic or using a slider, and customize the display range and note notation.

### What are the key features of Quinterval?

Key features include an interactive circle of fifths, display of major and parallel minor scales, adjustable display range, customizable note notation (German, English, Italian), clef selection (G, C, F), and display of key signatures. Additional features like parallel minor scale display, triads, and note playback are available via in-app purchase.

### Is Quinterval free to use?

The core functionality of Quinterval is free. However, advanced features such as displaying the notes of the parallel minor scale, triads with chord names, and note playback are available as an in-app purchase.

### What devices is Quinterval compatible with?

The provided data does not specify device compatibility. However, as a mobile application, it is designed to run on smartphones and tablets that support its operating system.

### How can Quinterval be used for learning music theory?

Quinterval is useful for learning music theory by providing a visual representation of key relationships and scale structures. Users can explore how keys relate to each other, understand key signatures, and identify major and minor scales, aiding in composition and harmonic analysis.

## Version history (last 5 releases)

### 2.4 — 2026-07-19

Adjustments for iOS 26
The displayed key can be selected directly in the circle (Pro version)
In the settings, sound output can be enabled even when the mute switch is activated (Pro version)

### 2.3 — 2024-10-29

Note playback with different sounds for the pro version
Localized in Spanish and French

### 2.2 — 2023-10-10

On the iPad in landscape mode, the top of the circle could have been cut off. 
New icon for the settings.

### 2.1 — 2020-10-23

The circle can now display scales from F-flat major (D-flat minor) to G-sharp major (E-sharp minor). The visible part of the circle is adjusted by an additional slider
Also, the design was modified a little bit.

### 2.0.2 — 2020-08-18

For chords in the higher registers, the accidentals were not taken into account during playback.
Mails from the imprint used the wrong subject

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| [Guitar Gravitas: Total ed.](https://appshunter.io/ios/app/guitar-gravitas-total-ed/id1329435840) | 4.8 (257) | $12.99 | Music |
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| [All Chords - All Scales](https://appshunter.io/ios/app/all-chords-all-scales/id1613557968) | 4.3 (6) | Free | Music |

## More apps by Oliver Hahn

- [Trivice](https://appshunter.io/ios/app/trivice/id324458005)
- [Polytrome](https://appshunter.io/ios/app/polytrome/id367282309)
- [Trivice HD](https://appshunter.io/ios/app/trivice-hd/id375604287)
- [Field of Depth](https://appshunter.io/ios/app/field-of-depth/id662879911)
- [Trilight - Trivice Light](https://appshunter.io/ios/app/trilight-trivice-light/id670194444)

All apps by Oliver Hahn: https://appshunter.io/developer/324458008

## Related topics

[key signature](https://appshunter.io/ios/topics/key-signature)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-25.*