Your Coo
Their CooMake a private connection.
Send one trusted person an invite link. It expires after 10 minutes, and your shared key stays in your devices’ secure storage.
It starts in the messenger you already use
There’s more than meets
the eye.
A message arrives in your usual chat. Copy it into Coo—and discover what they really meant.
Get Coo↓Your messenger shows the sentence. Coo opens what you really meant.
The real flow
Not another chat app.
A layer beneath yours.
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.
Write what they see—and what you mean.
Coo encrypts the private message and seals it inside the ordinary sentence as one copyable envelope.
Paste it into the chat you already use.
To everyone looking at the conversation, it is simply the visible sentence. There is no new Coo chatroom or inbox.
Copy. Paste. Open the meaning beneath.
Your person copies the full message from the messenger and pastes it into Coo. Only the matching connection can open it.
The actual app, in motion
Two screens.
The whole idea.
Not campaign artwork. These are short recordings of the real English app: one screen seals the meaning, and the other opens it.
01 / Create Secret
Write the message they see—and the one you mean.
On the Create screen, you write a private message for your person and an ordinary sentence for everyone else. Coo encrypts them into one copyable message.
01Write the secret only your person should see.
02Add the visible sentence that belongs in the chat.
03Seal it, copy it, and send it through any messenger.
02 / Open Secret
Paste the sentence. Watch the meaning appear.
On the Open screen, your person pastes the full message copied from the messenger. Coo reads the private layer and reveals it inside the living glass.
01Copy the complete message from your usual chat.
02Paste and confirm it in Coo.
03The visible sentence falls away. The shared meaning opens.
The visible sentence remains.
The chat app keeps what looks like an ordinary message.
The private meaning opens.
The encrypted layer is opened with your connection key.
No Coo chat history.
Coo doesn’t become another place full of conversations.
Private by design
A secret layer.
Not a second inbox.
Secret messages are protected with AES-256-GCM and are not uploaded to or stored on a message server. Coo keeps no message history in the app.
No sign-up or login
Keys stay in secure device storage
Open once by default
Say what only the two of you can see.
Free to start · Three secrets a day