Frozen ChatPrivate. Frozen. Yours.
Messages, calls and files locked on your device before they leave it. No phone number, no e-mail, no ads, no trackers. Just a username, and keys that never leave your hands.
Everything you expect from a messenger. Nothing you don't want.
End-to-end encryption
Every message, file and call is encrypted on your device with the Signal protocol. Only the people in the chat can read it.
Post-quantum keys
Chats start with PQXDH (ML-KEM / Kyber) and groups use a hybrid X25519 + ML-KEM suite, against harvest-now, decrypt-later.
Username only
No phone number. No e-mail. Pick a username and start. Your address book is never uploaded.
Sealed sender
Messages travel in sealed envelopes: the server delivers them without being told who sent them.
Private groups
Groups run on MLS (RFC 9420) with post-quantum keys. Up to 100 people free, 1,000 on paid plans.
Voice & video calls
1:1 calls with keys agreed end to end and checked inside the encrypted chat. Relays only see noise.
Voice messages
Hold to record, slide to lock. Encrypted like everything else.
Stickers
Built-in sticker packs, bundled with the app: nothing is fetched from third parties.
One-time media
Send a photo or video that can be opened once, then it's gone from the chat.
App lock
Lock the app behind your fingerprint or your phone's screen lock, and hide its content in the app switcher.
Multi-device + Web
Link your computer with a QR code and use Frozen Chat Web in the browser, end-to-end encrypted.
Open source
Client, server and protocol are public under the AGPL-3.0. Read it, build it, check it.
Self-hostable (later)
The server is one open-source binary. Running your own is planned, with documentation.
The server is a blind courier.
Our server routes sealed envelopes and stores public keys. It never holds your private keys and never sees what you write, send or say. Even if it were stolen, there would be no messages to read.
How the encryption works →Can't see
- Your messages and files
- Your calls
- Who sent a sealed message
- Group names and members' roles
- Your phone number (there isn't one)
Can see
- That an account exists
- Your IP while you're connected (not stored)
- Rough sizes and timing of envelopes
- Your licence tier
Free forever. Upgrade with a key, pay in crypto, stay anonymous.
Pro $4.99 / month · Business $24.99 / 6 months · Elite $39.99 / year. No subscription, no account needed to buy.