Concentric Rhythm is an interactive tool for generating, developing, and exploring musical patterns. It uses geometric transformations and many other simple processes to create, develop, and evolve music.

The looping musical timeline is visualized as a circle, which allows you to treat musical patterns as concentric shapes. This makes performing geometric transformations such as rotations, reflections and folding very natural and intuitive.
It also provides tools for melodic lines such as random-walk generation and scale-based inversion and transposition.
You can generate rhythmic lines using cross-rhythms or the Euclidean algorithm, and allows for great visualisations of complex polyrhythms.

Concentric Rhythm now allows you to assign each pattern to a different MIDI channel and send your results to other MIDI compatible apps or devices.

Concentric Rhythm was originally developed as a new way to improvise electronic music, but it is also a great tool experimenting with and developing musical material, or just for casually playing with music in a unique, hands-on, way.

Many of the ideas here were inspired by the book ‘The Geometry of Musical Rhythm’ and this app is a powerful tool for anyone who is interested in exploring these ideas. But at the same time is easy enough to use that anyone (even with no musical or mathematical background) can make interesting musical patterns and think about the musical world a little differently.

Note: There are known compatibility issues when used with AUM, especially on iOS 14

What’s New

Version 3.0.1

- bugfixes
- UI improvements

Ratings and Reviews

4.0 out of 5
3 Ratings

3 Ratings

Drumchops ,

Caused my other apps to crash

This app didn't work, with some of my other recording and routing apps.

It wouldn't launch in AUM, and had to be launched separately. Once it was running in AUM, I tried to route the audio to a track in Cubasis version 3.2, and it caused Cubasis to crash. Cubasis 3 wouldn't re-launch until I shut down this app.

I didn't pay for the midi out upgrade, so I don't know how midi out would affect these other app problems.

On it's own, it produced some interesting patterns, but unless it's updated to address these issues, I won't be able to use it in my recording setup.

App Privacy

The developer, Jeff Holtzkener, indicated that the app's privacy practices may include handling of data as described below. For more information, see the developer's privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


Jeff Holtzkener
46.5 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
In-App Purchases
  1. MIDI Send $6.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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