Zero Secure Messenger
Secure messaging & calls.
Free · Designed for iPad. Not verified for macOS.
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.
more What's New:
New languages
Zero is now available in Spanish, French, German, Portuguese, and Dutch, alongside English. The interface, settings, chats, calls, and the secure vault are translated, and your language is selected automatically based on your device settings.
Bug fixes and performance improvements.
1.0.9 3 days ago
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.
1.0.8 10 May
What's new in 1.0.7
Group Calls. Encrypted voice and video calls with up to 8 people. Already in a 1:1 call? Add anyone in your contacts and turn it into a group call instantly.
Story Indicators. A small red dot appears on a contact's avatar — in your conversation list, contacts list, and on the toolbar plus button — whenever they post a story you haven't seen yet.
Modern Composer. The message input has been completely redesigned: a floating glass pill with a morphing send button and tactile spring-press feedback.
Custom Chat Backgrounds. Set any photo from your library as the wallpaper for individual chats, with a built-in scrim that keeps text readable.
Redesigned Account & License Screens. Floating avatar above the account card, copy-to-clipboard Zero ID, status pill colored by subscription health, and a sleeker license activation screen with one-tap paste.
A Cleaner Look. Conversation list cards now match the Settings card style, so the whole app reads with a single, consistent surface.
Reliability
- VoIP push tokens refresh on every login and unregister on logout, so call notifications work correctly when switching accounts on the same device.
- Re-register Encryption Keys performs a full local session reset before uploading, fixing rare decryption failures after long offline periods.
- Account deletion now reliably wipes every trace of cryptographic material from our servers.
Plus a long list of bug fixes and stability improvements.
1.0.7 5 May
What's New in Zero 1.0.6
• Message Masking — Cipher text overlay on all messages. Tap to decipher with smooth character-by-character animation. Toggle in Settings → Privacy.
• Fixed voice calling — stale call detection prevents false busy signals.
• Pre-key auto-replenishment prevents silent message failures on long-lived accounts.
• API URLs no longer exposed in error messages.
• Bug fixes and performance improvements.
1.0.6 12 Apr
What's New in Zero 1.0.5
• Voice Recorder Redesigned — New recording UI with animated waveform, trash to cancel, and one-tap send.
• Subscription Refresh — Chats and Calls lock when expired with a refresh button. Contacts, Vault, and Settings remain accessible.
• Profile Media — Media & Files loads directly from the database with faster thumbnails.
• Scroll-to-Bottom — More reliable detection, no longer stays sticky.
• Security improvements to pre-key rotation and cross-platform session recovery.
• Bug fixes and performance improvements.
1.0.5 10 Apr
What's New in Zero 1.0.4
• Chat Appearance — Customize bubble colors and chat backgrounds with 8 color presets and 9 background options. Light and dark theme-aware.
• Invoices — Send and receive encrypted invoices in DMs and group chats. Track payments in real-time.
• Invoice List — View all your invoices across every conversation with filters and totals.
• 14-Day Free Trial — Try Zero with full features. No payment required.
• Theme Picker — Choose Dark, Light, or Auto theme during setup and in Settings with visual preview cards.
• Delete Account — Permanently delete your account, all data, and revoke your license with confirmation.
• In-App Updates — Automatic App Store version checks with update banner.
• Group Labels — Admins can assign custom labels to group members.
• Rich Replies — Reply previews now show image thumbnails, file icons, and media indicators.
• Tap to Jump — Tap any reply to scroll to the original message.
• Improved profile media loading and thumbnail caching.
• Security hardened pre-key rotation and cross-platform session recovery.
• Bug fixes and performance improvements.
1.0.4 8 Apr
NEW FEATURES
- Message Forwarding - Forward messages to any contact or group
- Starred Messages - Save important messages for quick access, tap to jump directly to them in chat
- Draft Auto-Save - Never lose unsent messages, automatically saved and restored
- Contact Card Sharing - Share contacts within Zero or via system share
- Call Reminder - Set a reminder to call back when declining incoming calls
- Custom Decline Message - Send a personalized message when declining calls
- Swipe-to-reply — Swipe any message to quote-reply instantly
- Link previews — URLs now show rich preview cards with image, title, and description
- Message retry — Tap failed messages to re-send with one touch
- Renewed Typing indicators — See when someone is typing in real time
- Image compression — Photos send faster and use less data without visible quality loss
- Swipe actions on chat list — Swipe to pin, mute, or delete conversations
- Multi-select — Long-press to select and bulk-delete conversations
- Scroll-to-bottom button — Quickly jump back to latest messages
- Haptic feedback — Tactile response across all key interactions
- Shimmer loading — Smooth loading animations for media
- Vault access while expired — Access your vault even if your subscription lapses
IMPROVEMENTS
- Share group member contact cards with long-press
- Star and draft indicators in chat and conversation list
- Enhanced privacy controls for Hidden ID users
- Forwarded message labels
- Improved message action menu
- Bug fixes and performance improvements
1.0.3 4 Mar
What's New in Version 1.0.2
New FAQ Section
Comprehensive FAQ added to Settings with answers to common questions
Covers Getting Started, Messaging, Calls, Security, Account, and Troubleshooting
Improved Contact Management
Contact names now display correctly everywhere (was showing ZeroID in some places)
Deleting a contact now removes them for both users
Chat conversations properly clear when you delete a contact
Notification Fixes
Fixed duplicate notifications for contact requests
Notifications now show contact names instead of IDs
Encryption Improvements
Faster secure session setup when adding new contacts
Better recovery after app reinstall
Bug Fixes & Stability
General performance improvements
Various bug fixes
1.0.2 5 Feb
What's New in Version 1.0.1
Calls
Keyboard automatically dismisses when making or receiving calls
Improved call history with detailed status indicators (missed, declined, busy, no answer)
New call history filters: All, Missed, Outgoing, Incoming
Picture-in-Picture improvements for video calls
Fixed video view when returning from PiP
Messaging
Share sheet now displays proper filename instead of server URL
Added Refresh Session option to fix message decryption issues
Improved connection status indicator (less intrusive, no flashing)
Groups
Better error handling for leave group and remove member actions
Improved feedback when group actions fail
Security & Reliability
Improved encryption key replenishment for cross-platform reliability
Fixed duplicate notifications from push and WebSocket
Settings
Added About page with security specifications and protocols
Added license key viewer with show/hide toggle
Auto-formatting license key entry with dashes
Bug Fixes & Performance
Various bug fixes and performance improvements
1.0.1 3 Feb
What's New:
New languages
Zero is now available in Spanish, French, German, Portuguese, and Dutch, alongside English. The interface, settings, chats, calls, and the secure vault are translated, and your language is selected automatically based on your device settings.
Bug fixes and performance improvements.
more Version 1.0.9 3 days ago
Data Not Collected The developer does not collect any data from this app.
