Zemzeme

Zemzeme - Private messaging that doesn't need the internet to work.

No account. No phone number. No central server. Just open the app, pick a nickname, and start talking. Every message is end-to-end encrypted - always.

Most messengers stop working when you lose signal. Zemzeme doesn't. It uses Bluetooth mesh networking to send messages through nearby devices - no Wi-Fi, no mobile data, no internet required. When you do
have connectivity, two additional transport layers activate automatically for global reach.

Three transport layers, working simultaneously:

★ Bluetooth Mesh - Messages hop between nearby devices using Bluetooth LE. Works in airplane mode, underground, in rural areas, or anywhere there's no signal. Perfect for festivals, emergencies, travel, and
off-grid communication.

★ Peer-to-Peer (libp2p) - Direct encrypted connections over the internet. No middleman server. Powered by libp2p, the same protocol used by IPFS and Ethereum.

★ Nostr Relay - Decentralized relay-based messaging for maximum reachability when direct connections aren't possible.

The app automatically routes messages through whichever paths are available and falls back seamlessly.

Built for privacy:
• End-to-end encryption on every message (Noise Protocol - Curve25519 + ChaCha20-Poly1305)
• No registration, no phone number, no email
• No analytics, no tracking, no ads - ever
• No data leaves your device unencrypted
• Optional Tor routing for network-level anonymity
• Verify contacts by scanning their QR code (Ed25519 signed)
• PIN + biometric app lock

What you can do:
• Send text messages with @mentions
• Record and send voice notes
• Share images and files of any type
• Join location-based public channels (city or country scale)
• Create password-protected group chats
• Verify peer identities with QR codes
• See read receipts and delivery indicators
• Relay messages for others on the Bluetooth mesh automatically

Use cases:
• Music festivals and crowded events with no signal
• Natural disasters when cell towers go down
• Travel in areas with limited or no connectivity
• Privacy-conscious everyday messaging
• Communities wanting communication free from centralized control
• Off-grid and outdoor adventures

How it works:
1. Open the app — no sign-up required
2. Grant Bluetooth and location permissions
3. Choose a nickname
4. Start messaging - nearby Zemzeme users appear automatically on the mesh
5. Tap + to join a location channel or start a private chat

Zemzeme is open source and built on proven cryptographic libraries. Your privacy is not a feature - it is the foundation.