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.

What's New

Version 2.0

Many, many changes!
- Inter-App Audio and Audiobus Compatibility
- MIDI Send (as IAP)
- Landscape for iPad
- Completely redesigned Note List now integrated into main display
- Velocity based transformations
- Global reverb control
- User sample management
- Improved system for project saving
- Tempo calculations based on user selected meter
- Many bug fixes

Ratings and Reviews

4.3 out of 5

11 Ratings

11 Ratings


Henry Junior

Excited by the app, so promising and lots to like. Then, I bought the midi out In-app purchase for $5 only to discover that the Audiobus integration doesn't support midi in Audiobus 3. That's kind of baffling. Hope it's gonna be added soon. I paid for midi out because I wanted to route midi from this app via Audiobus 3 to other Audiobus midi apps.

Update: thanks to the developer for explaining. It might be worth communicating that in the app description (something akin to does not yet support Audiobus 3 but will.)

Developer Response

Hi, the Audiobus 3 SDK has not been publicly released yet! It has been presumably shared with the makers of many high profile apps, but it hasn't been made it available to the majority of developers yet. I'll definitely include it in a future update.

What a wonderful work! Also suggestion!


Option for auto-starting newly loaded project would be helpful

Paying for midi outputs?


I had a conversation with this guy about making this app with 16 midi outputs a few months ago, even sent him some concepts. That’s when I paid for this app and midi outputs was part of the purchase. Now it still doesn’t even have 16 midi outputs and he’s charging people to use 1 midi output?



Jeff Holtzkener
37.2 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© Jeff Holtzkener
In-App Purchases
  1. MIDI Send $4.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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