# Protocol 4 vs Zen Island

The clearest difference is in-app purchases: Zen Island at none against Protocol 4's 7. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Protocol 4 sells 7 one-off in-app purchases. Zen Island asks for nothing beyond the download.

## The numbers

| Metric | Protocol 4 | Zen Island |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | — |
| Size | 12 MB | 7 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HAKAN OZGER](https://appshunter.io/developer/1855495033) | [Niv Nisanov](https://appshunter.io/developer/1460002173) |

## What reviewers say

### Protocol 4

[App page](https://appshunter.io/ios/app/protocol-4-code-breaker-pvp/id6755742805)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pocket Change | $0.99 | one-time |
| Starter Kit | $1.99 | one-time |
| Agent License | $2.99 | one-time |
| Hacker's Stash | $4.99 | one-time |
| Pro Kit | $4.99 | one-time |
| Trust Fund | $9.99 | one-time |
| Master Kit | $9.99 | one-time |


### Zen Island

[App page](https://appshunter.io/ios/app/zen-island/id6759974201)

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

**In-app purchases:** none


## Frequently asked questions

### Is Protocol 4 free?

Protocol 4 is free to download, with in-app purchases available.

### Is Zen Island free?

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

### Do Protocol 4 or Zen Island have ads?

Both Protocol 4 and Zen Island show ads.

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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.*