Device Discovery
Broadcast encrypted SOS beacons via Bluetooth Low Energy (100m range) and Wi-Fi Direct (200m range) simultaneously. Devices within proximity automatically detect distress signals without any pre-configuration.
Offline-First Emergency Protocol
When Networks Fail,
Humans Connect.
Decentralized mesh network enabling emergency communication without internet, cellular, or cloud infrastructure. Peer-to-peer. Zero knowledge. Maximum resilience. Built for disasters, remote areas, and authoritarian shutdowns.
No Accounts Required No Tracking Ever P2P Encrypted Battery Optimized
Bluetooth LE 5.0 Wi-Fi Direct Mesh Topology E2E Encryption
Bluetooth Mesh
Wi-Fi Direct
Mesh Relay
Each receiving device automatically forwards the emergency packet with TTL (Time To Live) protection against infinite loops. Messages hop across the mesh until they reach responders or exit nodes.
Privacy Preserved
Rotate device IDs every 15 minutes. No permanent identifiers stored. Location precision decreases with distance to protect sender identity. All messages are end-to-end encrypted with ephemeral keys.
Natural Disasters
Earthquakes, floods, and hurricanes destroy cellular towers. LYF SOS creates instant local networks for rescue coordination and survivor location in devastated areas.
Remote & Rural Areas
Hiking accidents, mining incidents, and rural emergencies often occur outside cellular coverage. Offline mesh bridges the gap until professional rescue arrives.
Network Shutdowns
During protests, conflicts, or authoritarian blackouts, governments cut internet access. LYF SOS maintains communication channels completely independent of centralized infrastructure.
Crowded Emergencies
Concerts, stadiums, and festivals overload cellular networks. Bluetooth mesh creates local communication layers for medical emergencies and lost person recovery.
Dual-Radio Broadcasting
Simultaneous Bluetooth LE 5.0 and Wi-Fi Direct transmission maximizes discovery probability across heterogeneous device ecosystems.
Ultra-Low Power Standby
Background mesh participation consumes under 5% battery daily through adaptive beaconing intervals and sleep scheduling.
Zero-Knowledge Architecture
No server ever sees message content, metadata, or user identities. Ephemeral X25519 key exchange per session.
Auto-Destructing Data
All relayed packets and temporary keys are cryptographically shredded 24 hours after emergency resolution.
Universal Android Support
Compatible with Android 8.0+ devices requiring only 2GB RAM. No root access, special hardware, or carrier dependencies.
Cross-Platform Mesh Bridging
Protocol specifications published openly. iOS and embedded device implementations can join the same mesh network.
We Never
- Require phone numbers, emails, or any identity verification.
- Upload message content or metadata to cloud servers.
- Track location outside of active emergency broadcasts.
- Run background analytics, profiling, or behavioral tracking.
- Monetize user attention, data, or metadata through advertising.
- Maintain permanent conversation logs or relay histories.
We Always
- Delete all relayed data 24 hours after emergency resolution.
- Operate completely offline with air-gapped capability.
- Consume under 5% battery per day in mesh standby mode.
- Support Android 8.0+ with minimum 2GB RAM requirement.
- Publish complete open-source cryptography and protocols.
- Verify release builds through reproducible compilation.
How does LYF SOS work without internet or cellular service?
LYF SOS uses your phone's built-in Bluetooth Low Energy and Wi-Fi Direct radios to create a decentralized mesh network. When you activate an SOS signal, your device broadcasts encrypted packets that nearby phones detect and automatically relay forward. Each relay extends the network range, allowing messages to travel kilometers across a chain of devices without ever touching the internet or cellular infrastructure.
Is LYF SOS completely free and open source?
Yes. LYF SOS is released under the MIT License and available on GitHub. There are no in-app purchases, no premium tiers, and no advertising. The project is maintained by volunteers and supported by donations from privacy advocates and disaster relief organizations.
What is the maximum communication range?
Direct device-to-device range is approximately 100 meters for Bluetooth LE and 200 meters for Wi-Fi Direct in open conditions. However, the mesh network extends this exponentially—each device that receives and relays a message becomes a new broadcast point. In dense urban environments with hundreds of participating devices, effective network coverage can span several kilometers.
How does LYF SOS protect my privacy and identity?
LYF SOS implements a zero-knowledge architecture. Device identifiers rotate every 15 minutes to prevent tracking. Location data is deliberately degraded with distance—precise GPS is shared only with immediate neighbors, while distant relays receive approximate regional data. All messages use end-to-end X25519 encryption with ephemeral keys that are destroyed after delivery. No account creation means no linkable identity.
Will LYF SOS drain my battery if I keep it installed?
No. In standby mesh mode, LYF SOS consumes less than 5% battery per day. The app uses adaptive beaconing—when no emergency is active, devices enter a low-power listening state with periodic wake intervals. During an active emergency relay, power consumption increases temporarily but respects Android Doze mode and app standby optimizations to minimize impact.
Can LYF SOS be used for non-emergency communication?
LYF SOS is specifically designed and optimized for emergency scenarios. While the underlying mesh protocol could theoretically support general messaging, the application intentionally restricts usage to distress signals, medical emergencies, and disaster coordination to prevent network congestion and maintain the ethical integrity of the emergency spectrum. For general offline messaging, we recommend dedicated mesh messaging apps.
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