# C vs DuoZorg

The clearest difference is update cadence: DuoZorg at every 6 weeks against C's every 6 months. C's advantage is device support (3 vs 1) and iOS requirement (9.0 vs 16.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

C ships an update every 6 months, DuoZorg every 6 weeks. The most recent releases landed on October 1, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | C | DuoZorg |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Size | 13 MB | 60 MB |
| Requires iOS | **9.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Bluebird Software](https://appshunter.io/developer/1471615225) | [Poolmanager](https://appshunter.io/developer/1029382671) |

## What reviewers say

### C

[App page](https://appshunter.io/ios/app/c-iris/id1471615706)

**Features:** macOS Compatibility

**In-app purchases:** none


### DuoZorg

[App page](https://appshunter.io/ios/app/duozorg-poolmanager/id6470641970)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is C free?

C is free to download, with no in-app purchases.

### Is DuoZorg free?

DuoZorg is free to download, with no in-app purchases.

### Do C or DuoZorg have ads?

Neither C nor DuoZorg shows ads.

### Which is updated more often, C or DuoZorg?

C ships an update every 6 months, and DuoZorg every 6 weeks. Most recently, C was updated on October 1, 2026 and DuoZorg on October 8, 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.*