# JamEngine vs ZZZ Polyrhythm

The clearest difference is ads: JamEngine at none against ZZZ Polyrhythm's shown. JamEngine also leads on update cadence (every 5 days vs every 6 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. JamEngine sells 1 one-off in-app purchase and ZZZ Polyrhythm sells 1 in-app purchase, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

JamEngine ships an update every 5 days, ZZZ Polyrhythm every 6 weeks. The most recent releases landed on September 9, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | JamEngine | ZZZ Polyrhythm |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 6 weeks |
| Size | 149 MB | 6 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Orcun Keskin](https://appshunter.io/developer/1681326325) | [SMOLT STAGE, K.K.](https://appshunter.io/developer/1708601451) |

## What reviewers say

### JamEngine

[App page](https://appshunter.io/ios/app/jamengine/id6759828737)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| JamEngine Pro | $8.99 | one-time |


### ZZZ Polyrhythm

[App page](https://appshunter.io/ios/app/zzz-polyrhythm/id6773375285)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZZZ Polyrhythm Premium | $0.99 | per month |


## Frequently asked questions

### Is JamEngine free?

JamEngine is free to download, with in-app purchases available.

### Is ZZZ Polyrhythm free?

ZZZ Polyrhythm is free to download, with in-app purchases available.

### Do JamEngine or ZZZ Polyrhythm have ads?

ZZZ Polyrhythm shows ads; JamEngine does not.

### Which is updated more often, JamEngine or ZZZ Polyrhythm?

JamEngine ships an update every 5 days, and ZZZ Polyrhythm every 6 weeks. Most recently, JamEngine was updated on September 9, 2026 and ZZZ Polyrhythm on September 10, 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.*