Crypton Messenger

Crypton Messenger is a private communication app for Android, iOS and macOS focused on end-to-end encryption.

Security
• Direct chats are end-to-end encrypted with X25519 key agreement and XSalsa20-Poly1305 authenticated encryption (libsodium nacl.box).
• Group chats use the Signal Sender Keys protocol.
• Local message database is encrypted on disk.
• Optional app lock with biometric or PIN.
• Screen-capture detection for sensitive views.

Messaging
• One-to-one and group chats.
• Send text, photos, videos, voice messages and files.
• Reply, forward, edit and delete messages.
• Disappearing messages with a per-chat auto-delete timer.
• Chat folders and hidden chats.

Calls
• Voice and video calls between Crypton users over WebRTC.
• System call UI integration (Telecom / ConnectionService).

Other
• Channels and stories.
• Push notifications.
• Dark theme.

Crypton Messenger is under active development and is currently open for public testing. Please report issues from the in-app support chat.