# Rot13 (Unix Flashback)

> Simple letter substitution cipher for obscuring text. (iPhone/iPad app by Macplugins.)

- Source: https://appshunter.io/ios/app/rot13-unix-flashback/id995122989 (this page in markdown: same URL + `.md`)
- Developer: [Macplugins](https://appshunter.io/developer/364191414)
- Category: Utilities, Social Networking
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 18.0 · 1 MB
- Languages: American English
- Released: 2015-06-11
- Data updated: 2026-06-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/rot13-unix-flashback/id995122989/reviews.md

## What is Rot13 (Unix Flashback)?

Rot-13 (short for rotate 13) is a simple letter substitution cipher that was popular in online forums for hiding spoilers, punchlines, offensive material, and other things from a casual glance. It works by replacing the current english letters in a message with those that are 13 positions ahead in the alphabet. For example, the letter a is replaced by n, b by o, c by p, etc. Numbers and punctuation are not encoded.

This lets you type in and convert with the app, share text from another app to convert, or include in a shortcut.

## Key features

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

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/rot13-unix-flashback/id995122989/reviews.md

### 5/5 — Perfect 1313

*2025-03-29*

Perfect 💯

### 5/5 — Tbbq vt

*2024-10-04*

Freirf vg’f checbfr

### 4/5 — Goood

*2023-02-21*

Gooood

### 1/5 — Unusable

*2022-09-13*

Can’t get beyond the welcome screen. I suspect the keyboard covers a start button

## Frequently asked questions about Rot13 (Unix Flashback)

### What is Rot13 (Unix Flashback)?

Rot13 (Unix Flashback) is a utility app that uses the Rot-13 cipher to substitute letters. It shifts each English letter 13 places forward in the alphabet, commonly used to hide spoilers or sensitive content.

### How does Rot13 (Unix Flashback) work?

It replaces each letter in a message with the letter 13 positions ahead in the alphabet. For example, 'a' becomes 'n', and 'n' becomes 'a'. Numbers and punctuation remain unchanged.

### Can I use Rot13 (Unix Flashback) to share text?

Yes, you can type text directly into the app for conversion, or share text from other applications to be encoded or decoded.

### Does Rot13 (Unix Flashback) have ads?

No, Rot13 (Unix Flashback) does not contain advertisements.

### What devices is Rot13 (Unix Flashback) available on?

Rot13 (Unix Flashback) is available for iPhone and iPad devices.

### How often is Rot13 (Unix Flashback) updated?

The app was last updated on November 9, 2024, indicating active maintenance. Its latest version is 3.0.

### What is the age rating for Rot13 (Unix Flashback)?

Rot13 (Unix Flashback) has an age rating of 4+, making it suitable for a wide range of users.

### Is Rot13 (Unix Flashback) free to use?

Yes, Rot13 (Unix Flashback) is completely free to download and use, with no in-app purchases or ads.

## Version history (last 5 releases)

### 3.0 — 2024-11-09

Modernized the application.  Sharing text with Rot13 from another app will show the translated text directly instead of requiring an extra button push.

### 2.1 — 2019-09-27

Fixes problems with the keyboard and the share sheet.

### 2.0 — 2019-09-21

Rewritten for iOS 13 with a new look that supports Dark Mode and includes a share sheet extension and support for Siri Shortcuts.

### 1.1 — 2019-01-20

Updated look, new info screen with description and links to new information.  Party like it's 1979!

### 1.0 — 2015-06-10

No release notes.

## Apps similar to Rot13 (Unix Flashback)

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [TRIGGERcmd](https://appshunter.io/ios/app/triggercmd/id1505878463) | 5.0 (2) | Free | Utilities |
| [5 Euro VPN - Best Cheapest VPN](https://appshunter.io/ios/app/5-euro-vpn-best-cheapest-vpn/id1368569380) | 4.1 (19) | Free | Utilities |
| [Quickteller -Payments & Wallet](https://appshunter.io/ios/app/quickteller-payments-and-wallet/id1451802854) | 2.7 (104) | Free | Utilities |
| [Push Authenticator Pro](https://appshunter.io/ios/app/push-authenticator-pro/id1436459026) | — | Free | Utilities |
| [hVPN: Secure VPN by Hacken](https://appshunter.io/ios/app/hvpn-secure-vpn-by-hacken/id1541214347) | 3.8 (14) | Free | Utilities |
| [Receive SMS Plus](https://appshunter.io/ios/app/receive-sms-plus/id6463490061) | 4.4 (1,431) | Free | Utilities |

## More apps by Macplugins

- [bsd fortune](https://appshunter.io/ios/app/bsd-fortune/id381642295)
- [WordTiles!](https://appshunter.io/ios/app/wordtiles/id1294521040)
- [Corny Jokes](https://appshunter.io/ios/app/corny-jokes/id6757873673)

All apps by Macplugins: https://appshunter.io/developer/364191414

## Related topics

[macplugins](https://appshunter.io/ios/topics/macplugins) · [caesars cipher](https://appshunter.io/ios/topics/caesars-cipher) · [caesar cipher](https://appshunter.io/ios/topics/caesar-cipher)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-04.*