End-to-end encrypted with Signal Protocol and post-quantum cryptography. Your messages disappear from our servers after delivery.
Download on the App Store Coming soon on AndroidEvery layer of Cyfr is built to protect your conversations from the moment you hit send.
Every message encrypted with Signal Protocol. We can't read them. No one can.
Kyber/ML-KEM cryptography protects against future quantum computing threats.
Messages deleted from our servers after delivery. Your history lives only on your device.
Conversations stored in an encrypted database on your phone.
We don't collect data to sell. No behavioral tracking, no ad profiles, no data mining.
Built on the same proven Signal Protocol trusted by security researchers worldwide.
Five steps, zero exposure. Your plaintext never leaves your device.
You send a message
Encrypted on your device
Relayed through our server
Delivered and deleted
Decrypted on their device
Ad targeting requires reading your messages and building a profile of your interests. Cyfr is architecturally designed so this can never happen. The server never sees your plaintext — only encrypted data that is deleted within seconds of delivery. There is no message history to mine, no behavioral data to analyze, no profile to sell. Even if our servers were compromised or subpoenaed, there is nothing there. This is not a privacy policy promise — it is a structural guarantee.