# Cipher Sender vs Rot13 (Unix Flashback)

The clearest difference is rating: Rot13 (Unix Flashback) at 5.0 against Cipher Sender's 4.6. Cipher Sender's advantage is review sentiment (95% vs 75%) and ratings volume (39 vs 2). On price, ads, in-app purchases and monetization model 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 4.6. That said, the two scores are not equally well evidenced: Cipher Sender has 39 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 95% of Cipher Sender's written reviews are positive against 75% of Rot13 (Unix Flashback)'s, so the app with the better star average is not the one people write more warmly about.

Cipher Sender ships an update every 9 months, Rot13 (Unix Flashback) every 26 months. The most recent releases landed on October 4, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Cipher Sender | Rot13 (Unix Flashback) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (39 ratings)](https://appshunter.io/ios/app/cipher-sender/id548958077/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rot13-unix-flashback/id995122989/reviews)** |
| Number of ratings | **39** | 2 |
| Positive reviews | **94.6% of reviews** | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 months** | Every 26 months |
| Monetization | Free | Free |
| Size | 1 MB | 1 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Julian Tigler](https://appshunter.io/developer/1763289322) | [Macplugins](https://appshunter.io/developer/364191414) |

## What reviewers say

### Cipher Sender

[App page](https://appshunter.io/ios/app/cipher-sender/id548958077)

This app allows you to send secret messages to your friends using a variety of historical ciphers and codes. It supports popular encryption methods like Caesar Shift, Morse Code, and Vigenere Cipher. The application is open source, inviting community contributions.

**Highlights:** A1Z26 Cipher, Atbash Cipher, Caesar Shift Cipher, Morse Code, Vigenere Cipher, Open Source

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Cipher Sender free?

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

### Is Rot13 (Unix Flashback) free?

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

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

Rot13 (Unix Flashback) is rated higher. Cipher Sender averages 4.6 out of 5 from 39 ratings, while Rot13 (Unix Flashback) averages 5.0 from 2 ratings.

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

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

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

Cipher Sender ships an update every 9 months, and Rot13 (Unix Flashback) every 26 months. Most recently, Cipher Sender was updated on October 4, 2026 and Rot13 (Unix Flashback) on September 16, 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.*