# Rot13 (Unix Flashback) vs Sub Cipher

The clearest difference is rating: Rot13 (Unix Flashback) at 5.0 against Sub Cipher's 3.8. Sub Cipher's advantage is review sentiment (100% vs 75%) and update cadence (every 7 months vs every 26 months). On price, ratings volume, ads and in-app purchases 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) holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews complicate that: 75% of Rot13 (Unix Flashback)'s written reviews are positive against 100% of Sub Cipher's, so the app with the better star average is not the one people write more warmly about.

Rot13 (Unix Flashback) ships an update every 26 months, Sub Cipher every 7 months. The most recent releases landed on September 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Rot13 (Unix Flashback) | Sub Cipher |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rot13-unix-flashback/id995122989/reviews)** | [3.8 (4 ratings)](https://appshunter.io/ios/app/sub-cipher/id1582898316/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | 75.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 7 months** |
| Monetization | Free | Free |
| Size | 1 MB | 40 MB |
| Requires iOS | 18.0 | **16.6** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Macplugins](https://appshunter.io/developer/364191414) | [Eduard Schwan](https://appshunter.io/developer/594336989) |

## 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


### Sub Cipher

[App page](https://appshunter.io/ios/app/sub-cipher/id1582898316)

Easily encode and decode messages using simple substitution ciphers like Caesar and Atbash. Convert up to 2,000 characters at a time and save your cipher settings for later use. Ideal for fun educational purposes, not for serious secret messaging.

**Highlights:** Encode/decode simple substitution ciphers, Supports Caesar and Atbash cipher methods, Converts up to 2,000 characters at once, Save cipher settings as text, Create magic decoder wheels, No licensing or royalties required for published ciphers

**Features:** 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 Sub Cipher free?

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

### Which has better reviews, Rot13 (Unix Flashback) or Sub Cipher?

Rot13 (Unix Flashback) is rated higher. Rot13 (Unix Flashback) averages 5.0 out of 5 from 2 ratings, while Sub Cipher averages 3.8 from 4 ratings.

### Do Rot13 (Unix Flashback) or Sub Cipher have ads?

Neither Rot13 (Unix Flashback) nor Sub Cipher shows ads.

### Which is updated more often, Rot13 (Unix Flashback) or Sub Cipher?

Rot13 (Unix Flashback) ships an update every 26 months, and Sub Cipher every 7 months. Most recently, Rot13 (Unix Flashback) was updated on September 16, 2026 and Sub Cipher on October 1, 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.*