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Sencrypt

Post-quantum, end-to-end encrypted chat. Unreadable to everyone but the people you send to — even a future quantum computer. No email, no phone number, no password.

Download for Android APK · Android 7.0+ · arm64 / arm / x86_64 Download for Windows Installer · Windows 10/11 · 64-bit

🔑 How accounts work

You don't sign up with an email, phone, or password. When you create a profile you're given a private account number — a bit like Mullvad VPN. That number is your identity and your login, on this or any device. Keep it somewhere safe: it's the only way in, and there is no reset.

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Signal's audited crypto — Kyber1024 PQXDH, Double Ratchet, SPQR post-quantum ratchet, sealed sender.
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The server never sees plaintext — or, under sealed sender, even who sent a message.
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Anonymous by design — a random account number, not your identity. Pick any username for friends to find you.
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Encrypted on your device — your local vault is sealed with your account number (Argon2id + XChaCha20).
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Verify people yourself — compare a safety number; the relay can't impersonate.
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Stays current — the app updates itself when a new version ships.

Installing on Android: tap download, then open the APK. Your phone will ask you to allow installs from your browser (and Samsung phones: turn off Auto Blocker in Settings → Security & privacy). That's expected for an app installed directly rather than from a store.

Unofficial build, self-hosted relay. The cryptographic protocol is Signal's audited libsignal; the app around it is a personal project and not independently audited. The same account number works on Android and desktop.