Coo: Secret Messages

Hide a private message inside an ordinary sentence. Keep using the messenger you know—only your Coo connection can open the secret.

Keeping a relationship private at work—or simply not ready to make it public? Share a quiet conversation that stays between you and someone you trust.

Coo is not another messenger. Keep using the messaging apps you already know. Coo encrypts your private message on your device and places it inside text that looks like an ordinary sentence. Your connection opens that sentence in Coo to read the original message.

How Coo works

1. Write a private message in Coo.
2. Copy the ordinary-looking sentence Coo creates.
3. Paste and send it in your usual messenger.
4. Your connection opens it in Coo.

Privacy by design • AES-256-GCM encryption runs on your device. • Connection keys stay in each device's secure storage. • Private messages are not uploaded to or stored on Coo servers, and Coo keeps no message history. • Biometric or device lock and screen-capture protection help guard the screen. • By default, an envelope opened once cannot be opened again on that device.

Use Coo for a confession, a surprise, or an address or account number you would rather not leave visible in a chat.

Free and subscription The free plan includes one connection and three sends per day. Opening a message you receive is always free.

A subscription adds multiple connections, unlimited creation and sending, and a choice of alternate app icons. Encryption and privacy protections are identical on both plans.

[Subscription] Monthly and yearly subscriptions are available. The price shown in the app is localized for your App Store region. Payment is charged to your Apple Account. The subscription renews automatically unless canceled at least 24 hours before the current period ends. You can manage or cancel it in your App Store account settings. Privacy Policy: https://sendcoo.com/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/