# Concentric Rhythm vs Polly

The clearest difference is in-app purchases: Polly at none against Concentric Rhythm's 1. Polly also leads on rating (5.0 vs 4.7) and review sentiment (100% vs 80%). Concentric Rhythm's advantage is update cadence (every 2 weeks vs every 9 months) and ratings volume (43 vs 2). On ads and device support there is nothing between them.

Concentric Rhythm costs $3.99 and Polly $0.99 up front. Concentric Rhythm sells 1 one-off in-app purchase. Polly asks for nothing beyond the download.

Polly holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Concentric Rhythm has 43 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 80% of Concentric Rhythm's written reviews are positive against 100% of Polly's.

Concentric Rhythm ships an update every 2 weeks, Polly every 9 months. The most recent releases landed on October 22, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Concentric Rhythm | Polly |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | [4.7 (43 ratings)](https://appshunter.io/ios/app/concentric-rhythm/id1188907944/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/polly-polyrhythmic-metronome/id1582544037/reviews)** |
| Number of ratings | **43** | 2 |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 9 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 44 MB | 5 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jeff Holtzkener](https://appshunter.io/developer/1087693055) | [591 Group Ltd.](https://appshunter.io/developer/1582544039) |

## What reviewers say

### Concentric Rhythm

[App page](https://appshunter.io/ios/app/concentric-rhythm/id1188907944)

Generate, develop, and explore musical patterns using geometric transformations and simple processes. Visualize musical timelines as circles for intuitive manipulation and create complex rhythms and melodies. Connect to other MIDI-compatible apps and devices.

**Highlights:** Geometric pattern generation, Circular musical timeline visualization, Melodic line tools (random-walk, scale-based), Rhythmic line generation (cross-rhythms, Euclidean algorithm), MIDI output to other apps/devices, Visualizations of polyrhythms

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MIDI Send | $4.99 | one-time |


### Polly

[App page](https://appshunter.io/ios/app/polly-polyrhythmic-metronome/id1582544037)

Explore complex rhythms with a versatile metronome app. It offers five tracks for accents, subdivisions, polyrhythms, and hypertuplets, with options to mute tracks for customized assistance. Designed for accessibility, it supports VoiceOver and offers stereo or mono audio.

**Highlights:** Polyrhythm exploration, Five customizable tracks, Accent and subdivision support, VoiceOver compatibility, Background audio playback, MIDI output for DAWs

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

**In-app purchases:** none


## Frequently asked questions

### Is Concentric Rhythm free?

Concentric Rhythm costs $3.99, and also offers in-app purchases.

### Is Polly free?

Polly costs $0.99, with no in-app purchases.

### Which has better reviews, Concentric Rhythm or Polly?

Polly is rated higher. Concentric Rhythm averages 4.7 out of 5 from 43 ratings, while Polly averages 5.0 from 2 ratings.

### Do Concentric Rhythm or Polly have ads?

Neither Concentric Rhythm nor Polly shows ads.

### Which is updated more often, Concentric Rhythm or Polly?

Concentric Rhythm ships an update every 2 weeks, and Polly every 9 months. Most recently, Concentric Rhythm was updated on October 22, 2026 and Polly on October 16, 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.*