# Sub Cipher vs Secret KB

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.

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.

## The numbers

| Metric | Sub Cipher | Secret KB |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.8 (4 ratings)](https://appshunter.io/ios/app/sub-cipher/id1582898316/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 10 days** |
| Monetization | Free | — |
| Size | 40 MB | 6 MB |
| Requires iOS | 16.6 | **14.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eduard Schwan](https://appshunter.io/developer/594336989) | [Asadullah Jamadar](https://appshunter.io/developer/1655125846) |

## What reviewers say

### Sub Cipher

[App page](https://appshunter.io/ios/app/sub-cipher/id1582898316)

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.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none


### Secret KB

[App page](https://appshunter.io/ios/app/secret-kb/id1605391634)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sub Cipher free?

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

### Is Secret KB free?

Secret KB costs $0.99, with no in-app purchases.

### Do Sub Cipher or Secret KB have ads?

Neither Sub Cipher nor Secret KB shows ads.

### Which is updated more often, Sub Cipher or Secret KB?

Sub Cipher ships an update every 7 months, and Secret KB every 10 days. Most recently, Sub Cipher was updated on October 27, 2026 and Secret KB on October 27, 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.*