# Rot13 (Unix Flashback) vs Caesar

The clearest difference is rating: Rot13 (Unix Flashback) at 5.0 against Caesar's 1.0. Rot13 (Unix Flashback) also leads on ads (none vs shown) and monetization model (free vs ad-supported). Caesar's advantage is update cadence (every 2 weeks vs every 26 months) and iOS requirement (15.0 vs 18.0). On price, ratings volume, 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) holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Rot13 (Unix Flashback) ships an update every 26 months, Caesar every 2 weeks. The most recent releases landed on September 16, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Rot13 (Unix Flashback) | Caesar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/rot13-unix-flashback/id995122989/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/caesar-cipher/id1559575000/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 26 months | **Every 2 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 1 MB | 43 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Macplugins](https://appshunter.io/developer/364191414) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## 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


### Caesar

[App page](https://appshunter.io/ios/app/caesar-cipher/id1559575000)

This utility tool encrypts and decrypts text using a Caesar cipher. Users can specify a shift value to transform their messages. Converted text can be saved within the application for later use.

**Highlights:** Caesar cipher encryption, Caesar cipher decryption, Customizable shift parameter, Save converted strings, Text transformation utility

**Features:** macOS Compatibility

**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 Caesar free?

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

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

Rot13 (Unix Flashback) is rated higher. Rot13 (Unix Flashback) averages 5.0 out of 5 from 2 ratings, while Caesar averages 1.0 from 1 ratings.

### Do Rot13 (Unix Flashback) or Caesar have ads?

Caesar shows ads; Rot13 (Unix Flashback) does not.

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

Rot13 (Unix Flashback) ships an update every 26 months, and Caesar every 2 weeks. Most recently, Rot13 (Unix Flashback) was updated on September 16, 2026 and Caesar 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.*