Sub Cipher

Encode and Decode Messages

Free

Sub Cipher is an easy-to-use Encoder/Decoder app, which can encode or decode "simple substitution ciphers." It works on the "Caesar" and "Atbash" style cipher methods, which are simple offset-alphabet ciphers. The well-known "Rot13" cipher is one of these. 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 creates 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 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 the settings you used with each cipher along with the cipher itself. Here are the 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 yours to re-print or sell -- No licensing or credits or royalties are required. Caveat Emptor: 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.

Ratings & Reviews

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* Added new button "Copy Decoder", which will copy an image of a circular decoder ring (as PDF) you can paste into your puzzle book. * Updated user interface and new icons for iOS 26. * Updated background image to a ripply sea theme, which handles light/dark mode better. * Removed the little reminder notifications when app is not launched for days...

Version 1.1.0

The developer, Eduard Schwan, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    The developer indicated that this app supports the following accessibility features. Learn More

    • Supported Features

      • VoiceOver

      • Larger Text

      • Dark Interface

      • Differentiate Without Colour Alone

      • Sufficient Contrast

      • Reduced Motion

    Information

    • Provider
      • Eduard Schwan
    • Size
      • 24.8 MB
    • Category
      • Utilities
    • Compatibility
      Requires iOS 12.0 or later.
      • iPhone
        Requires iOS 12.0 or later.
      • iPad
        Requires iPadOS 12.0 or later.
      • iPod touch
        Requires iOS 12.0 or later.
      • Mac
        Requires macOS 10.14 or later.
      • Apple Vision
        Requires visionOS 1.0 or later.
    • Languages
      • English
    • Age Rating
      4+
    • Copyright
      • © Copyright (c) 2025, SchwanSongs, all rights reserved
  • Developer Website
  • Privacy Policy

    • More by Eduard Schwan

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