Sotto - end-to-end encrypted messenger
Sotto is a free, end-to-end encrypted messenger. Sign up with just a handle - no phone number and no email required. Your encryption keys are created on your device and never leave it, so the server only ever sees ciphertext.
Features
- End-to-end encryption on every message
- No phone number or email - sign up with a handle
- Encrypted group chats and encrypted photo sharing
- Disappearing messages with a timer
- Secret chats that are never stored on the server
- Safety-number verification to rule out impostors
Frequently asked questions
Is Sotto really end-to-end encrypted?
Yes. Messages are sealed to the recipient's key in your browser before sending. The server stores only ciphertext and never holds your private key.
Do I need a phone number or email?
No. You only need a handle and a password.
Can the server read my messages?
No. Your private key stays on your device, so no one operating the service can read your messages.
Sotto requires JavaScript to run. Please enable JavaScript in your browser to start messaging.