AppID:	com.professor.zerion
Author:	Unknown
License:	GPL-3.0-only
Donation:	Webpage
InRepoSince:	2026-06-05
LastRepoUpdate:	2026-06-14
LastAppUpdate:	Unknown
LastVersion:	2.0.2
Categories:	Messaging
APK source:
Google Play:	Check if it's there

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 — both today's standard algorithms and the new NIST quantum-resistant ones. 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 calls over Tor
• Send photos, videos, voice notes, and documents
• Disappearing messages
• A built-in vault for passwords, notes, and private files
• Channels — a publisher-to-subscriber broadcast layer with optional discussion threads


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
• No subscriber-to-subscriber metadata leaks — subscribers don't see each other


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
• Open source on GitHub, GPL v3, audited per 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.


WHAT IT WON'T DO

• It won't message people who aren't on Zerion
• It won't work without an internet connection (Tor needs one)
• It won't restore your account if you forget the password — there is no recovery, and that's the point


LEARN MORE

• Website: https://zerion.chat
• Source: https://github.com/zerionproject/Zerion


Built on the Bramble protocol. GPL v3.