Rot13 (Unix Flashback) vs Caesar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rot13 (Unix Flashback)
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.
- Letter substitution cipher
- Rotate by 13 positions
- Hide spoilers and sensitive content
- Share text from other apps
- Integrate with shortcuts
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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.
Caesar
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.
- Caesar cipher encryption
- Caesar cipher decryption
- Customizable shift parameter
- Save converted strings
- Text transformation utility
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Converts a string into a string shifted the specified number of characters. The number of characters to shift is specified as the conversion parameter. For example, to shift the string AAAA by one character, set the conversion parameter to 1 and the selected string to AAAA. In this case, the converted string will be BBBB. The converted string can be saved in the app.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Rot13 (Unix Flashback) | Caesar |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 75.0% of reviews | — |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 26 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Macplugins | Hideaki Uchikoshi |
Customer experience
Rot13 (Unix Flashback)
Caesar
In-app purchases
Rot13 (Unix Flashback)
No in-app purchases
Caesar
No in-app purchases
Questions
Is Rot13 (Unix Flashback) free?
Is Caesar free?
Which has better reviews, Rot13 (Unix Flashback) or Caesar?
Do Rot13 (Unix Flashback) or Caesar have ads?
Which is updated more often, Rot13 (Unix Flashback) or Caesar?
Other comparisons
