xox — encrypted private chat

PROMPT ENGINE LLC

About this app

xox is a truly private messenger — encrypted, ephemeral, and built so your conversations leave no trace anywhere. No account. No phone number. No email. You open the app and you're in.

PRIVACY BY ARCHITECTURE, NOT BY PROMISE
Most messaging apps promise privacy. xox is built so there's simply nothing to collect:
- No accounts — no phone number, no email, no sign-up
- No message history on our servers — chats are end-to-end encrypted and ephemeral
- No cookies, no analytics, no ads, no trackers
- We can't read your messages, and we don't sell data we never collect

ENCRYPTION THAT STAYS AHEAD
Every message and call is encrypted on your device with a hybrid post-quantum scheme (ML-KEM-768 + ECDH P-256), a Double Ratchet, and AES-256-GCM. Voice and video calls are end-to-end encrypted. Contact verification lets you confirm no one is in the middle.

EPHEMERAL BY DESIGN
What you say here never happened. The server forgets each message the instant it's delivered, and with disappearing messages it's gone from your devices too. No logs. No trace.

WHAT YOU CAN DO
- Private 1:1 chats and encrypted group chats
- End-to-end encrypted voice and video calls
- Photos, voice notes and disappearing messages
- View once — photos seen a single time, then gone
- Duress PIN — a decoy code opens an empty version
- Camouflage mode and voice masking
- Join with a link, a code or a QR — no friction, no sign-up

FOR EVERYONE WHO VALUES PRIVACY
Whether you want a secure messenger for everyday chats or serious private messaging with post-quantum encryption, xox keeps your conversations yours. Private chat, the way it should be.

xox — conversations that never existed.

What’s new

- Brand notification icon and color on every device
- Secure screen: screenshots and screen recording blocked inside the app
- Google-free devices (GrapheneOS, AOSP): notifications via xox's own encrypted channel
- In-app update notice for direct installs
- Stability and performance improvements