Fernweh - Offline Messages

Offline Protocol

About this app

Connect Beyond the Grid
Fernweh is a hybrid messenger that works everywhere, online or off. Chat, call, and share files over a decentralized Bluetooth mesh network when there's no internet, and seamlessly switch to an encrypted online relay when connectivity returns. No central servers storing your data. No compromises.

Why Choose Fernweh?
- Works Online & Offline: Communicate over a peer-to-peer Bluetooth mesh network or through an encrypted online relay, whichever is available.
- Voice & Video Calls: Make end-to-end encrypted audio and video calls, with full native call integration and push notifications even when the app is closed.
- End-to-End Encrypted Everything: Messages, calls, media, and group chats are all protected with end-to-end encryption, including MLS protocol for groups.
- No Central Servers: Your messages live on your device. There's no cloud inbox to hack, no metadata to harvest.
- Built for Real Life: Whether you're off-grid, in a crowded venue, or just privacy-conscious, Fernweh adapts.

Key Features:
- Offline Mesh Messaging: Send texts and files over Bluetooth and WiFi Direct to devices within 100 meters, no internet required.
- Online Relay: When you're online, messages route through an encrypted WebSocket relay for unlimited range.
- Audio & Video Calls: Crystal-clear encrypted calls with native call UI, VoIP push, and connection quality indicators.
- Group Chats: Create encrypted group conversations with MLS protocol security.
- Media & File Sharing: Share photos and documents with encrypted cloud storage and local persistence.
- Message Forwarding & Replies: Forward messages across chats and reply inline to keep conversations organized.
- Connection Requests: Add contacts through the mesh or online, like a friend request, but decentralized.
- Chat Folders: Organize your conversations into custom folders and filters.
- App Lock: Protect the app with biometric or passcode authentication.
- Profiles & Reputation: Customizable profiles with photos, bios, and community reputation scores.
- User Blocking: Block unwanted contacts across both mesh and online channels.
- Dark & Light Themes: Full theme support including system-matching mode.
- Push Notifications: Never miss a message or call, even when the app is in the background.

Ideal For:
- Travelers & Adventurers: Stay in touch while exploring remote trails, deserts, or mountain ranges with zero signal.
- Festivals & Events: Communicate reliably in crowded venues where cell networks are overloaded.
- Emergency & Disaster Response: Coordinate when infrastructure is down, Fernweh keeps working.
- Privacy-First Users: For anyone who believes messaging should be private by default, not by opt-in.
- Communities & Teams: Encrypted group chats with organized folders for coordinated communication.

How It Works:
Fernweh creates a peer-to-peer mesh network using Bluetooth and WiFi Direct between nearby devices. Messages are encrypted and relayed device-to-device until they reach their recipient. When the internet is available, an encrypted online relay extends your reach globally. Calls connect through secure signaling with end-to-end encryption. Everything is stored locally on your device never on a central server.

Get Started Today!
Download Fernweh and take back control of your conversations, online, offline, everywhere.

Ratings and reviews

onboarding is very intuitive and app ui is very seemless

so far it only worked on the initial connection with my brother. Now every time we hit to sync it crashes the app. And we can't connect back again. I sent him some messages he never received.

Good ides. But failed to receive the code to verify. This is maybe the easiest part but you guys couldn't do it well. Sign.