iPhone Screenshots


This futuristic, yet strangely retro technology allows you to break the secret codes supplied in the 1960s Sci-Fi comic "TV Century 21".

The original issue of the comic on January 23rd 1965 came with a functionally identical code-breaker but, more than 50 years later they are a very rare beast indeed and possibly chewed and mouldy as they were made of thin card and paper. So, if you have some old copies of the magazine (and you can buy them online!) and you've been yearning to know what those secret messages at the foot of the pages were then this is just the app you've been looking for!

If you were feeling mischievous you could of course encode your own messages to surprise your friends on Social Media. :-)

*) Supports Red and Blue encoding and decoding
*) Shake to clear
*) Exciting futuristic, retro look, feel and sounds
*) Escapist fun and silliness
*) Auto decode message shared by fellow agents
*) VoiceOver support

Please contact me through my website if you have any questions.

What’s New

Version 1.7

• Switches replaced - now works better at night where possible

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

Sitting by the fire ,

Century21 Secret Agent

If you were a fan of Century21 comics (Thunderbirds, Stingray, Fireball XL5 and all the Gerry and Sylvia Anderson productions) then you'll love this little app. The design is true to the spirit of 1960s sci-fi puppetry.
The comics used to have secret messages in code, which you could only decipher if you had the key.
This little app does it all for you. Write your message and it will translate it into blue or red code and back again. Use it if you don't want people prying on your emails (of course the person you're sending to will need IdentiCode too) or if you really are a secret agent. Shh ...

Developer Response ,

Thanks for such kinds words and glad you like the style.


Stephen Watson
15.3 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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