LYF SOS — Offline Emergency Safety App
SOS alerts without internet. Privacy-first emergency app.
FreeOpen Source342 impressionslaunches Oct 24
LYF SOS is an offline-first emergency app that sends encrypted SOS alerts via Bluetooth and Wi-Fi Direct without internet.
- for
- People in disaster-prone, remote, or censored areas needing reliable emergency communication.
- pricing
- free
- license
- MIT
Key features
- Decentralized mesh network — Creates peer-to-peer communication using Bluetooth LE and Wi-Fi Direct without central servers.
- End-to-end encryption — All messages are encrypted with ephemeral X25519 keys and destroyed after delivery.
- Zero-knowledge privacy — No accounts, no data collection, device IDs rotate every 15 minutes.
- Ultra-low power standby — Consumes under 5% battery per day while listening for SOS beacons.
- Automatic mesh relay — Devices forward SOS packets with TTL protection, extending range across many hops.
- Open-source MIT license — Source code is publicly available on GitHub and can be audited or forked.
Use cases
- Coordinating rescue efforts after earthquakes or floods where cellular towers are down.
- Enabling hikers or miners to signal distress in areas without cellular coverage.
- Maintaining communication during government-imposed internet shutdowns or protests.
- Providing a local emergency channel at crowded events where networks become overloaded.
LYF SOS — Offline Emergency Safety App vs alternatives
| LYF SOS — Offline Emergency Safety App |  LAN Orangutan |  LAN Sheriff |  Pocketenv |  Firecamp | |
|---|---|---|---|---|---|
| Best for | Offline mesh emergency alerts | Network discovery and monitoring | Server visibility | Agent sandboxing | API testing |
| Pricing | Free | Free | Free | Free | Free |
| DevHunt upvotes | 1 | 35 | 32 | 73 | 48 |
| Launched | Oct 2028 | Jul 2026 | Aug 2026 | Apr 2026 | Jan 2023 |
- LYF SOS — Offline Emergency Safety App vs LAN Orangutan: Focuses on network scanning with Tailscale, not emergency SOS messaging.
- LYF SOS — Offline Emergency Safety App vs LAN Sheriff: Provides a map of server traffic, not peer-to-peer emergency alerts.
- LYF SOS — Offline Emergency Safety App vs Pocketenv: Universal sandbox runtime for agents, unrelated to offline emergency communication.
- LYF SOS — Offline Emergency Safety App vs Firecamp: Open-source API testing tool, not a mesh emergency app.
LYF SOS — Offline Emergency Safety App FAQ
How does LYF SOS work without internet or cellular service?+
It uses Bluetooth LE and Wi-Fi Direct to broadcast encrypted SOS packets that nearby phones detect and relay, forming a decentralized mesh.
Is LYF SOS completely free and open source?+
Yes, it is released under the MIT License on GitHub with no in-app purchases, premium tiers, or ads.
What is the maximum communication range?+
Direct range is ~100 m (Bluetooth) and ~200 m (Wi-Fi Direct); the mesh can extend coverage to several kilometres in dense device environments.
How does LYF SOS protect my privacy and identity?+
Device IDs rotate every 15 minutes, location data is degraded with distance, and all messages are end-to-end encrypted with keys destroyed after 24 hours.
Will LYF SOS drain my battery if I keep it installed?+
In standby mode it uses less than 5% battery per day, with higher but short-lived usage during active emergencies.
Summarized by DevHunt from lyfsos.lyfmail.com · Oct 1, 2026. Details may change; check the official site.
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