Encrypted Group Messaging
Zero-compromise group security. Messages are encrypted locally on the sender device for all group members. Servers cannot inspect conversation topics or member payloads.
Group Security Architecture
High-performance cryptographic protocol built for teams.
Sender Keys Protocol
Generates a sender chain key distributed pairwise to all members. Provides high-speed multi-recipient encryption without server decryption.
Admin Controls & Re-keying
Group admins manage memberships cleanly. When a member leaves, group keys are instantly rotated to guarantee future messages cannot be read by departed members.
Encrypted Group Media
All photos, videos, and documents sent to group chats are encrypted locally before uploading to zero-knowledge relays.
Metadata Minimization
No group avatars, conversation titles, or group membership lists are exposed in plaintext on cloud servers.
Explore Other Core Features
Discover CALL's end-to-end encrypted capabilities.
Encrypted Chat
1-on-1 E2EE messaging with Double Ratchet security.
HD Voice Calls
Crystal-clear 48kHz Opus audio over DTLS-SRTP WebRTC.
HD Video Calls
1080p 60FPS encrypted video stream with zero facial mining.
File & Media Sharing
AES-256 chunked streaming for photos, videos, and documents.
High Performance
Microsecond DB queries, 0.08s warm launch, zero battery drain.
Protect Your Team Communications
Available on iOS and Android. Start collaborating securely with zero subscriptions.