UDPChat

P2P chat app using UDP hole punching — no servers, no relays, pure peer-to-peer

A serverless, peer-to-peer chat app that uses UDP hole punching for direct communication between devices.

How It Works ┌─────────────────────────────────────────────────────────┐ │ UDP Hole Punching │ ├─────────────────────────────────────────────────────────┤ │ │ │ Phone A ──────────────────────────────────── Phone B │ │ │ │ │ │ │ 1. Send UDP to B's IP:port │ │ │ │ ─────────────────────────────────────► │ │ │ │ │ │ │ │ 2. Send UDP to A's IP:port │ │ │ │ ◄───────────────────────────────────── │ │ │ │ │ │ │ │ 3. NAT creates mapping │ │ │ │ 4. Direct P2P connection established │ │ │ │ │ │ │ └─────────────────────────────────────────┘ │ │ │ └─────────────────────────────────────────────────────────┘ Features Pure P2P — no servers, no relays, no intermediaries UDP hole punching — works through NAT on many networks X25519 key exchange — cryptographic identity End-to-end encryption — messages encrypted with shared secret Instant messaging — direct connection after hole punching