# PSiO vs Cap Zen

The clearest difference is in-app purchases: PSiO at none against Cap Zen's 1. PSiO also leads on iOS requirement (9.0 vs 16.4). Cap Zen's advantage is update cadence (every 4 months vs every 11 months). On price, ads and device support there is nothing between them.

Both are free to download. Cap Zen sells 1 in-app purchase, starting at $34.99 per 6 months. PSiO asks for nothing beyond the download.

PSiO ships an update every 11 months, Cap Zen every 4 months. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | PSiO | Cap Zen |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 4 months** |
| Size | 25 MB | 68 MB |
| Requires iOS | **9.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Psychomed.com SA](https://appshunter.io/developer/1318018249) | [CAP ZEN International SRL](https://appshunter.io/developer/1709362679) |

## What reviewers say

### PSiO

[App page](https://appshunter.io/ios/app/psio/id1318018250)

**Features:** macOS Compatibility

**In-app purchases:** none


### Cap Zen

[App page](https://appshunter.io/ios/app/cap-zen/id6467927070)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription | $34.99 | per 6 months |


## Frequently asked questions

### Is PSiO free?

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

### Is Cap Zen free?

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

### Do PSiO or Cap Zen have ads?

Neither PSiO nor Cap Zen shows ads.

### Which is updated more often, PSiO or Cap Zen?

PSiO ships an update every 11 months, and Cap Zen every 4 months. Most recently, PSiO was updated on October 3, 2026 and Cap Zen on October 9, 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.*