HD Voice Calls
Crystal-clear audio with the Opus codec at 48 kHz / 192 kbps. Two-party calls relayed through our SFU media server with DTLS-SRTP encryption for low-latency communication.
Opus 48 kHz · WebRTCVocisHD
Secure HD Communication
A private VoIP application with 48 kHz Opus HD audio (192 kbps), end-to-end encrypted messaging, encrypted file transfers, and zero tracking. Built for people who care about privacy.
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Play Store
COMING SOON
App Store Soon
✦ Features
Secure Messaging
End-to-end encrypted text messages using the Double Ratchet algorithm. Messages are deleted from the server immediately after delivery — nothing is stored long-term.
Double RatchetFile Transfer
Share images, videos, and documents with end-to-end encryption. Files are deleted from the server immediately after the recipient downloads them — one-time viewing by default.
Auto-delete 24hEnd-to-End Encryption
X3DH key agreement establishes a shared secret between you and your contact. All messages and files are end-to-end encrypted with AES-256. The server never has access to your private keys or message plaintext.
X3DH + AES-256Privacy First
No ads, no trackers, no analytics SDKs, no data sharing. We do not sell your data. Your messages and files cannot be decrypted by us.
Zero TrackingContact Management
Add contacts by username, see online status in real time, and manage contact requests with accept/reject. Unread message badges keep you informed at a glance.
Real-time Presence🔐 Encryption Architecture
⚡ X3DH + Double Ratchet
Key Agreement
X3DH (Extended Triple Diffie-Hellman) establishes a shared secret between parties using identity keys, signed pre-keys, and one-time pre-keys.
X3DH (Extended Triple Diffie-Hellman) establishes a shared secret between parties using identity keys, signed pre-keys, and one-time pre-keys.
Message Ratchet
Double Ratchet algorithm derives a unique encryption key for every message. Compromising one key does not expose past or future messages.
Double Ratchet algorithm derives a unique encryption key for every message. Compromising one key does not expose past or future messages.
Text & Files
AES-256-CTR + HMAC-SHA256 for authenticated end-to-end encryption. Files are streamed in 64 KB chunks with independent encryption per chunk.
AES-256-CTR + HMAC-SHA256 for authenticated end-to-end encryption. Files are streamed in 64 KB chunks with independent encryption per chunk.
Audio Calls
HD voice calls use Opus 48 kHz / 192 kbps over WebRTC, encrypted with DTLS-SRTP (AES-128-GCM or AES-256-GCM keyed from the DTLS handshake). Audio is relayed through our SFU server.
HD voice calls use Opus 48 kHz / 192 kbps over WebRTC, encrypted with DTLS-SRTP (AES-128-GCM or AES-256-GCM keyed from the DTLS handshake). Audio is relayed through our SFU server.
🎙️ Opus HD 48 kHz
🔐 X3DH
🔑 Double Ratchet
🔒 DTLS-SRTP
🔐 AES-256-CTR
🛡️ HMAC-SHA256
📌 Cert Pinning
🔗 HKDF
🌐 WebRTC
🔌 WebSocket
📡 SFU Relay
☕ Kotlin
⚡ Go
🗄️ SQLite
Server operational · HTTPS · EU-hosted