Coo: Secret Messages
In-app purchases
Everyone
info
50+
Downloads
About this app
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 Google Play region. Payment and automatic renewal are handled through Google Play. You can manage or cancel the subscription in the Play Store at any time.
Privacy Policy: https://sendcoo.com/privacy
Questions: hello@sendcoo.com
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 Google Play region. Payment and automatic renewal are handled through Google Play. You can manage or cancel the subscription in the Play Store at any time.
Privacy Policy: https://sendcoo.com/privacy
Questions: hello@sendcoo.com
Hide a private message in an ordinary sentence and share it in any chat.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- This app may collect these data typesFinancial info, App activity, and Device or other IDs
- Data is encrypted in transit
- You can request that data be deleted
What’s new
Fixed an issue that prevented messages copied from WhatsApp from opening.
App support
About the developer
조윤찬
otcanlove@gmail.com
계룡로922
202-1103
중구, 대전광역시 34964
South Korea