Zerion Chat

Zerion Project

About this app

Zerion Chat is a private, anonymous messenger that runs entirely over the Tor network. No phone number. No email. No account.

YOUR MESSAGES NEVER TOUCH A SERVER
All communication goes directly from your device to your contact over Tor hidden services. Nothing in the middle to hack, subpoena, or shut down.

NEW IN 1.7
• Post-quantum encryption now refreshes on every single message — not every 25. A single compromised key cannot decrypt any other message in the conversation, past or future.
• Group chat unread counter — Groups list shows a badge per group with unread messages, clears when you open the group.
• Multi-profile flow polished end-to-end — create, switch, sign out and sign back in are reliable across the full lifecycle.
• Voice call buttons labelled for screen readers.

FEATURES
• Encrypted messaging — text, images, voice messages, files
• P2P voice and video calls over Tor
• Private group chats with admin controls, end-to-end encryption and unread counters
• Multiple hidden profiles — separate identities on one device, each with its own password
• Disappearing messages — 5 min, 1 hour, 1 day or 1 week
• zVault — encrypted storage for notes, documents and photos
• Brute-force protection with auto-wipe after failed attempts

SECURITY
• Hybrid post-quantum encryption on every message — ML-KEM-768 + X25519
• Hybrid post-quantum signatures — ML-DSA-65 + Ed25519
• Triple Ratchet (Mode 3-Full) — forward secrecy and post-compromise security refresh on every individual frame
• AES-256-GCM encrypted calls
• Argon2id password hashing
• Hardware-backed vault key
• Zero metadata — your IP is never exposed to contacts

NO TRACKING. NO ADS. NO ANALYTICS.
Zero trackers, zero analytics SDKs, zero ads. Not by policy — by design.

Open source — GPL v3
Source code: github.com/zerionproject/Zerion
Also available on F-Droid.