# ROT13 Decoder vs ARK

The clearest difference is price: ROT13 Decoder at Free against ARK's $1.99. ROT13 Decoder also leads on iOS requirement (15.0 vs 17.0). ARK's advantage is update cadence (every 10 days vs every 8 months). On ads, in-app purchases and device support there is nothing between them.

ROT13 Decoder is free to download; ARK costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ROT13 Decoder ships an update every 8 months, ARK every 10 days. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ROT13 Decoder | ARK |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 10 days** |
| Size | 16 MB | 3 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [佳伟 蔡](https://appshunter.io/developer/1801859662) | [Gaelon Swift](https://appshunter.io/developer/1759501747) |

## What reviewers say

### ROT13 Decoder

[App page](https://appshunter.io/ios/app/rot13-decoder/id6743629613)

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

**In-app purchases:** none


### ARK

[App page](https://appshunter.io/ios/app/ark-emergency-tools/id6758130776)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ROT13 Decoder free?

ROT13 Decoder is free to download, with no in-app purchases.

### Is ARK free?

ARK costs $1.99, with no in-app purchases.

### Do ROT13 Decoder or ARK have ads?

Neither ROT13 Decoder nor ARK shows ads.

### Which is updated more often, ROT13 Decoder or ARK?

ROT13 Decoder ships an update every 8 months, and ARK every 10 days. Most recently, ROT13 Decoder was updated on October 13, 2026 and ARK on October 7, 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.*