MOSA Messenger

MOSA keeps people connected when the infrastructure they rely on is gone. When there is no cell coverage and no internet, MOSA carries your messages device to device over Bluetooth mesh — and much farther through LoRa/FSK gateways. Every message is end-to-end encrypted before it leaves your phone, so relays can pass it along without ever reading it. Built for search and rescue teams, event operations, remote field work and critical infrastructure — and for anyone who wants messaging that does not depend on a single provider staying online. WORKS WITHOUT INTERNET • Direct Bluetooth mesh between phones • LoRa/FSK hardware gateways extend the range far beyond Bluetooth • Multi-hop routing: messages relay through other devices to reach further • Vehicle hub mode turns a car into a moving mesh extension PRIVACY BY DESIGN • End-to-end encryption (ChaCha20-Poly1305, Ed25519, X25519) • No phone number, no email — your identity is a key pair on your device • No analytics SDKs • Optional internet gateway is opt-in and time-limited; you can run your own server and keep every message inside your own infrastructure BUILT FOR REAL CONDITIONS • Six message priority levels with automatic escalation for emergencies • Live location sharing that continues while the app is in the background • Voice messages, photos, files and group chats • Works fully offline from the first launch — fonts and assets are embedded MOSA is developed by Talivio Technology OÜ in Estonia. Privacy policy: https://mosa.talivio.com/privacy Terms of service: https://mosa.talivio.com/terms-of-service