Zero Secure Messenger
Zero Secure Messenger is a secure communication app built for enterprises and organizations that require private, controlled, and encrypted communication.
The app provides end-to-end encrypted messaging, voice and video calls, and secure media sharing, designed to protect identities and sensitive data.
Key Features
End-to-end encrypted messaging
Encrypted voice and video calls
Auto-expiring messages with custom timers
Encrypted file and media transfers
Message controls: reactions, replies, edit, revoke
Privacy-preserving user identifiers and group chats
Privacy-focused design
App lockscreen with PIN or password
Secondary access PIN for added security
Encrypted internal vault for files, images, videos, and notes
Decentralized internal contact list
Safety numbers and QR verification
Stories for secure internal updates
Integration with Zero MDM on iOS
In-app content reporting and user blocking
Zero Secure Messenger is designed for managed deployments and organizational environments where privacy, security, and control are essential. Users must agree to our End User License Agreement (EULA) which prohibits objectionable content and abusive behavior.
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
This release focuses on reliability around encryption recovery, identity verification, and a cleaner first-launch experience.
What's new
— Auto-recovery when a contact reinstalls. Your messages now retry against the new session automatically — up to ten recent in-flight messages are resent once the secure channel rebuilds, so you no longer need to send a new message just to restart the conversation.
— Identity-change banner. If a contact's encryption identity changes (for example, after a reinstall on their side), Zero now shows a clear banner in the chat. Tap it to compare the old and new safety numbers side-by-side and explicitly accept or reject the change instead of silently trusting the new key.
— Cleaner reinstall. Reinstalling Zero now starts you with an empty chat list. New conversations appear as messages come in, the same way Android works.
— Friendlier placeholder for messages that can't be decrypted, instead of empty bubbles.
Security
— Removed a legacy encryption fallback that could expose messages to a key derivable from public information. Every message is now end-to-end encrypted via Signal Protocol with no exception path.
— Crypto errors that were previously silent are now logged for diagnosis, so future issues can be tracked down faster.
Fixed
— An issue causing some users to be logged out unexpectedly during normal app use.
As always, no message content, no metadata, no logs, and no telemetry leave your device unencrypted.
Version 1.0.8
The developer, Vault Management, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary based, for example, on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Provider
Vault Management
Size
43.8 MB
Category
Social Networking
Compatibility
Requires iOS 17.6 or later.
iPhone Requires iOS 17.6 or later.
iPad Requires iPadOS 17.6 or later.
Mac Requires macOS 14.6 or later and a Mac with Apple M1 chip or later.
