Private messaging, peer to peer.
Signa is an end-to-end encrypted messenger for iOS. Messages travel directly between devices — not through our servers, because we simply don’t have any.
Download on the App Store Read the privacy policy
End-to-end by default
AES-256-GCM content, Curve25519 key agreement, Ed25519 signatures. Only the people in your group can read your messages.
No messages on any server
Messages flow peer-to-peer over WebRTC. The developer cannot read, subpoena, or lose what was never collected.
Keys stay on your phone
Your device keys live in the iOS Keychain, protected by the Secure Enclave. They never leave the phone that created them.
No tracking, no ads, no analytics
Signa contains no third-party SDKs for advertising or behavioral analytics. What the app does is what the app does.
How it works, briefly
When you create or join a group, Signa generates a fresh symmetric key for that group on your device and shares it, encrypted, with the other members’ devices. Every message is encrypted on your device with that key before it leaves. Signa uses Apple’s CloudKit (tied to your Apple ID) as an untrusted rendezvous to help devices find one another — the content stored there is encrypted, and the direct message stream runs over WebRTC once peers connect.
Because there is no central server holding your conversations, losing access to your device means losing access to the history on that device. That is the tradeoff for not trusting anyone else with your messages.
Legal & support
Legal documents
Privacy Policy — what the app does and does not touch.
Terms of Service — the rules of using Signa.
Contact
For support, bug reports, or legal inquiries, email support@bluecouchworks.com.