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.