CooGet CooInstall Coo on both phones, connect, and exchange hidden messages.
Connect once, write two meanings, and keep using the messenger you already have. The other person copies the ordinary-looking message into Coo to open what’s hidden.
Connect with your person in the app.
How it worksWrite the visible sentence and your private words. Coo encrypts the private words.
How it worksCopy the message and paste it into your usual chat.
How it worksYour recipient pastes the message into Coo to open the private words.
How it worksA message arrives in your usual chat. Copy it into Coo—and discover what they really meant.
How it worksPrivate text is never stored on Coo servers.
Private words for you and your connection.
const messageProtection = {
cipher: "AES-256-GCM",
key_bits: 256,
aad: "visible sentence",
processing: "on-device"
};
// Verify the cover text before opening the private words.
// Decrypt in Coo with the matching connection key.Explore how to create a message, open it and understand its encryption.
Write the visible sentence and your private words. Coo encrypts the private words.
GuidesInstall Coo on both phones, connect, and exchange hidden messages.
Yes. Create and open a message yourself to try it out.
Copy the message and paste it into your usual chat.