Zerion Chat

Zerion Project

About this app

Zerion is a private messenger. It runs over Tor, so your IP address is hidden from the people you message and from the network. There's no phone number, no email, no account on a server. Your messages live encrypted on your device.

Everything is end-to-end encrypted with hybrid post-quantum cryptography. That means both today's standard algorithms and the new NIST quantum-resistant ones, refreshed on every message instead of just the first handshake. If quantum computers arrive sooner than expected, your old conversations stay safe.


WHAT YOU CAN DO

• One-to-one chats with end-to-end encryption
• Group chats up to a few dozen people
• Voice and video calls over Tor
• Send photos, videos, voice notes, and documents
• Disappearing messages, with an optional default timer for new chats
• A built-in vault for passwords, notes, and private files, now with search and sort
• Channels, a publisher-to-subscriber broadcast layer with optional discussion threads


CALLS OVER TOR

Calls run peer-to-peer through Tor. No VoIP server, no STUN/TURN, no IP exposure. The audio and video go straight between devices, encrypted.

• Voice calls are on by default. You can turn them off any time in Settings
• Video calling is available as an opt-in beta
• Calls show a clear "Reconnecting" status and recover on their own if the connection briefly drops


CHANNELS

Channels are a one-to-many space. One person writes, many people read.

• Public channels: anyone with the invite link can subscribe
• Private channels: subscribers ask to join, the owner approves
• Discussion threads: owners decide whether subscribers can reply under each post
• Editor delegations: let trusted people post without sharing your identity key
• Pinned posts, reactions, attachments
• Mute notifications per channel
• Subscribers never see each other, so there is no subscriber-to-subscriber metadata


HARDENED MODE (OPT-IN)

Three independent protections under Security settings, all off by default:

• Refuse to start on tampered devices (unlocked bootloader, modified system)
• Refuse to start when a debugger, root, or hooking framework is detected
• Sign out automatically, or wipe, if ADB or file transfer is enabled over USB


PRIVACY AND SECURITY

• Tor-only transport. No Wi-Fi, Bluetooth, or LAN exposure
• No phone number, no email, no central server
• No telemetry, no analytics, no crash reporting
• No logging of any kind, verified at build time
• Encrypted at rest with SQLCipher and a password-derived key
• Screenshots blocked inside the app
• Notifications never show message previews
• Clipboard auto-clears after you copy sensitive items
• Open source on GitHub, GPL v3, audited every release


WHO IT'S FOR

People who want to talk to other people without a third party in the middle. Journalists and their sources, activists, lawyers and their clients, people in countries that block secure messengers. Anyone who doesn't want to hand a phone number to a tech company every time they install a messenger.


LEARN MORE

• Website: https://zerion.chat
• Source: https://github.com/zerionproject/Zerion
• F-Droid: https://f-droid.org/packages/com.professor.zerion/


Free and open source. GPL v3.