Great Concept!
Great app! App allows one to send "secret" messages to friends and family members without others knowing how to read. Love it!
Free
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About
Learn and practice Morse code and various historical ciphers. Decode real messages, send your own coded communications, and explore the history behind each secret code.
✓Learn Morse code via Koch and Farnsworth methods
✓Practice sending messages with an on-screen brass key
✓Decode real messages with 15 historical ciphers
✓Explore the history of each cipher
✓Personalized practice based on missed characters
✓Daily new intercepts for practice
✓Encode/decode messages for sharing
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What's New in Covert Mail
2.0.0
October 19, 2026
Covert Mail is back, rebuilt from the ground up. Learn Morse code by ear with the Koch method, then send it on a brass key. Work through fifteen dossiers of historical codes and ciphers with your handler's notes, decode a daily intercept, and send coded messages to friends from the cipher desk.
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FAQ
Does Covert Mail have ads?
Yes, Covert Mail contains advertisements. As a free application, it utilizes ads to support its development and continued availability.
What is the learning method for Morse code in Covert Mail?
Covert Mail uses the Koch method, teaching each character at full speed from the first lesson as a single sound. It also incorporates Farnsworth spacing, allowing for extra room between characters at your chosen speed to aid learning.
Can I send coded messages to friends without the app?
Yes, you can send coded messages to friends through any messaging app, with or without the key. Friends without the app can open and decode these messages directly in their web browser.
How does Covert Mail track my progress?
Your progress is saved directly on your phone and does not require an account. Practice sessions are designed around the characters you get wrong, with missed characters reappearing later with clues until mastered.
What historical ciphers are included in Covert Mail?
Covert Mail includes fifteen historical ciphers such as Morse code, NATO phonetic alphabet, Caesar shift, Atbash, tap code, pigpen, Braille, Polybius square, flag semaphore, keyword cipher, Vigenère, rail fence, ROT13, substitution cipher, and book cipher.
Is Covert Mail suitable for protecting real secrets?
No, Covert Mail is designed for learning and fun with classical codes only. It is not intended for protecting real secrets or for professional cryptographic use.
How often is Covert Mail updated?
The application was last updated on October 19, 2026, indicating a recent update. The app first appeared on the App Store in 2009 and this is a rebuilt version.
What devices does Covert Mail support?
Covert Mail is available on iPhone, iPad, and iPod. It is rated for ages 4 and up.