Sub Cipher vs Secret KB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sub Cipher
Easily encode and decode messages using simple substitution ciphers like Caesar and Atbash. Convert up to 2,000 characters at a time and save your cipher settings for later use. Ideal for fun educational purposes, not for serious secret messaging.
- Encode/decode simple substitution ciphers
- Supports Caesar and Atbash cipher methods
- Converts up to 2,000 characters at once
- Save cipher settings as text
- Create magic decoder wheels
- No licensing or royalties required for published ciphers
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Sub Cipher is an easy-to-use Encoder/Decoder app, which can encode or decode your text using various "simple substitution" cipher methods. * Simply type or copy-paste your encoded or decoded text to and from e-mail, messages, social media, and it is immediately converted for you. Up to 2,000 characters can be converted at a time. Sub Cipher offers you the encoded text, placeholder-text, and even a magic decoder wheel that you can add to your own books and publications. You can also capture the cipher settings you have dialed in (as lines of text) to save in another document. This can be useful if you are publishing a newsletter or book of ciphers, and want to keep a record of the settings you used with each cipher along with the cipher itself. Main Features: *Easy to use: Type into the plain-text or the cypher-text box, and the converted text is immediately displayed. *Easy to transfer: You can select all the converted text and paste it into any other text document. *Easy to adjust: Any substitution offset, forward or reverse can be dialed in. *Easy to save: The settings you dial in can also be saved as text for your notes. *Easy to publish: Any ciphers you make are 100% yours to publish and sell; no copyright restrictions or restrictive "commercial use" clauses here. *Forever Free: Download this software once and it is yours forever. You get all future new features and updates free. No upgrade costs or "subscription/rental" fees. Ever. *No Ads: You are never distracted from enjoying my software. *Human-Made: This software was completely and carefully hand-designed and written by me. No A.I. toys were allowed anywhere near this software. *Private: Your work is safely yours and always stays on your computer. You are never required to create internet accounts, and none of your information is ever stored in the cloud. * Caveat Emptor: It uses the "Caesar" and "Atbash" style cipher methods, which are simple offset-alphabet ciphers. The well-known "Rot13" cipher is one of these. These ancient styles of ciphers are very simple and easy to decode! This is simply a fun educational utility, and is not intended for serious "secret message" work.
Secret KB
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Send a normal text to your friend or anyone you want with a private and secret message! With Secret Text Keyboard, you can send secret messages to your friends on iMessage, Messenger, WhatsApp, Skype, Line, Wechat, Gmail, etc. While it seems to be no difference from other texts, a text sent by Secret Text Keyboard contains a secret message that can only be seen by you and the one you send it to. No private message will reveal itself until it is decoded by the recipient, which means your secret will be absolutely safe! Download Secret Text Keyboard now and feel free to convey your secrets! Here is how Secret Text Keyboard works as to: -Send A Secret 1. Install Secret Text Keyboard and allow full access. 2. Switch to Secret Text Keyboard and enter your secret message. 3. Tap the Encode button to make it seem like a normal text. 4. Tap send as usual. -Decode A Secret 1. Install Secret Text Keyboard and allow full access. 2. Copy the secret message you've received from your friend. 3. Tap the Decode button to decode that secret. About Allowing Full Access: Allowing full access does not grant us access to other keyboards that you have, except this Secret Text keyboard. Full access is necessary for encoding and decoding secret messages. We do not read, record or transmit anything you type. Secret Text Keyboard will be used strictly for entertainment purposes only.
Screenshots
Verdict
The clearest difference is price: Sub Cipher at Free against Secret KB's $0.99. Secret KB's advantage is update cadence (every 10 days vs every 7 months) and iOS requirement (14.0 vs 16.6). On ads, 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
Sub Cipher is free to download; Secret KB costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Sub Cipher ships an update every 7 months, Secret KB every 10 days. Both last shipped on October 27, 2026.
| Parameter | Sub Cipher | Secret KB |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 3.8 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 7 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 16.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 40 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Eduard Schwan | Asadullah Jamadar |
In-app purchases
Sub Cipher
No in-app purchases
Secret KB
No in-app purchases









