# Rot13 (Unix Flashback) vs ROT13 Decoder

The clearest difference is update cadence: ROT13 Decoder at every 8 months against Rot13 (Unix Flashback)'s every 26 months. ROT13 Decoder also leads on iOS requirement (15.0 vs 18.0). On price, ads, 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.

Rot13 (Unix Flashback) ships an update every 26 months, ROT13 Decoder every 8 months. The most recent releases landed on June 4, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Rot13 (Unix Flashback) | ROT13 Decoder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rot13-unix-flashback/id995122989/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 8 months** |
| Monetization | Free | — |
| Size | 1 MB | 16 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Macplugins](https://appshunter.io/developer/364191414) | [佳伟 蔡](https://appshunter.io/developer/1801859662) |

## What reviewers say

### Rot13 (Unix Flashback)

[App page](https://appshunter.io/ios/app/rot13-unix-flashback/id995122989)

This utility app performs a simple letter substitution cipher, rotating English letters by 13 positions. It's useful for obscuring text like spoilers or sensitive content from casual viewers. You can type directly, share text from other apps, or integrate it with shortcuts.

**Highlights:** Letter substitution cipher, Rotate by 13 positions, Hide spoilers and sensitive content, Share text from other apps, Integrate with shortcuts

**Features:** macOS Compatibility

**In-app purchases:** none


### ROT13 Decoder

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

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

**In-app purchases:** none


## Frequently asked questions

### Is Rot13 (Unix Flashback) free?

Rot13 (Unix Flashback) is free to download, with no in-app purchases.

### Is ROT13 Decoder free?

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

### Do Rot13 (Unix Flashback) or ROT13 Decoder have ads?

Neither Rot13 (Unix Flashback) nor ROT13 Decoder shows ads.

### Which is updated more often, Rot13 (Unix Flashback) or ROT13 Decoder?

Rot13 (Unix Flashback) ships an update every 26 months, and ROT13 Decoder every 8 months. Most recently, Rot13 (Unix Flashback) was updated on June 4, 2026 and ROT13 Decoder on September 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.*