Cipher Sender vs Rot13 (Unix Flashback)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cipher Sender
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.
- A1Z26 Cipher
- Atbash Cipher
- Caesar Shift Cipher
- Morse Code
- Vigenere Cipher
- Open Source
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Send secret messages with your friends! Cipher Sender includes some of the most popular ciphers and codes from throughout history including: - A1Z26 Cipher - Atbash Cipher - Caesar Shift Cipher - Keyboard Shift Cipher - Monoalphabetic Substitution - Morse Code - Rail Fence Cipher - ROT13 - Vigenere Cipher Cipher Sender is open source! Have an improvement in mind? Let us know at https://github.com/High5Apps/cipher-sender
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.
Screenshots
Verdict
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.
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 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.
| Parameter | Cipher Sender | Rot13 (Unix Flashback) |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (39 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 94.6% of reviews — better | 75.0% of reviews |
| Number of ratings | 39 — better | 2 |
| Update frequency | Every 9 months — better | Every 26 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Julian Tigler | Macplugins |
Customer experience
Cipher Sender
Rot13 (Unix Flashback)
In-app purchases
Cipher Sender
No in-app purchases
Rot13 (Unix Flashback)
No in-app purchases
Questions
Is Cipher Sender free?
Is Rot13 (Unix Flashback) free?
Which has better reviews, Cipher Sender or Rot13 (Unix Flashback)?
Do Cipher Sender or Rot13 (Unix Flashback) have ads?
Which is updated more often, Cipher Sender or Rot13 (Unix Flashback)?
Other comparisons
