Quinterval

Quinterval

Circle of Fifths with Scales

20 ratings
47 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • May 26, 2010
  • July 19, 2026

Features

Quinterval screenshot #1 for iPhone
Quinterval screenshot #2 for iPhone
Quinterval screenshot #3 for iPhone
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About

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.

โœ“Interactive circle of fifths
โœ“Major and parallel minor scale display
โœ“Adjustable display range
โœ“Customizable note notation (German, English, Italian)
โœ“Clef selection (G, C, F)
โœ“Key signature display
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What's New in Quinterval

2.4

July 19, 2026

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)

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1

In-App Purchases

$0.99

Enhanced Version

Unlocks Minor Scales, Triads and Sound Output

User reviews

Missing C Maj sharp & flat

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.

Great app!

This is a great app, with clean UI, and good pricing for the full version. My only gripes are that you canโ€™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 โ€œBothโ€), you canโ€™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 arenโ€™t added, but simpler things would like my first and last idea would be greatly appreciated.
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Simple and easy to use

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.

Fabulous tool

I have used this app for a long time. Itโ€™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!

Love the app

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

Developer apps

FAQ

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.