# Perfect Circle OTG vs Circle Zen

The clearest difference is ads: Circle Zen at none against Perfect Circle OTG's shown. Perfect Circle OTG's advantage is update cadence (every 5 days vs every 2 months) and iOS requirement (13.0 vs 16.4). On price, in-app purchases and device support there is nothing between them.

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

Perfect Circle OTG ships an update every 5 days, Circle Zen every 2 months. The most recent releases landed on September 7, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Perfect Circle OTG | Circle Zen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 5 days** | Every 2 months |
| Size | 23 MB | 40 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Japality Limited](https://appshunter.io/developer/1574046707) | [maoko](https://appshunter.io/developer/495151243) |

## What reviewers say

### Perfect Circle OTG

[App page](https://appshunter.io/ios/app/perfect-circle-otg/id6752425506)

**Features:** macOS Compatibility

**In-app purchases:** none


### Circle Zen

[App page](https://appshunter.io/ios/app/circle-zen/id6760607038)

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

**In-app purchases:** none


## Frequently asked questions

### Is Perfect Circle OTG free?

Perfect Circle OTG is free to download, with no in-app purchases.

### Is Circle Zen free?

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

### Do Perfect Circle OTG or Circle Zen have ads?

Perfect Circle OTG shows ads; Circle Zen does not.

### Which is updated more often, Perfect Circle OTG or Circle Zen?

Perfect Circle OTG ships an update every 5 days, and Circle Zen every 2 months. Most recently, Perfect Circle OTG was updated on September 7, 2026 and Circle Zen on September 20, 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.*