Modified Version Notice (GPLv3 §5a) This is a modified version of PairDrop. Modification: Complete backend rewrite from Node.js to Rust (Axum framework). Initial modification date: January 2026. Original authors: schlagmichdoch and contributors. See NOTICE for full attribution.

A Rust rewrite of PairDrop backend using the Axum framework.

Demo: pairdrop-rust.app.cosformula.org

• ✅ Fully compatible with original frontend
• ✅ WebSocket signaling server
• ✅ Auto-discovery (devices on same network)
• ✅ Device pairing (6-digit code)
• ✅ Public rooms (5-letter room code)
• ✅ WebRTC signaling relay
• ✅ WebSocket fallback (optional, for VPN environments)
• ✅ Rate limiting
• ✅ IPv6 support

docker run -d -p 3000:3000 ghcr.io/cosformula/pairdrop-rust:latest

cd server-rust
cargo build --release
./target/release/pairdrop-server

# Command line options
pairdrop-server [OPTIONS]

Options:
  -p, --port <PORT>          Port [default: 3000]
      --ws-fallback          Enable WebSocket fallback
      --rate-limit <N>       Enable rate limiting
      --localhost-only       Listen on localhost only
      --debug-mode           Enable debug mode
      --ipv6-localize <N>    IPv6 segments (1-7)

# Environment variables
PORT=3000
WS_FALLBACK=false
RATE_LIMIT=5
DEBUG_MODE=false
IPV6_LOCALIZE=4

# Build
docker build --platform linux/amd64 -f server-rust/Dockerfile -t pairdrop-rust .

# Run
docker run -d -p 3000:3000 pairdrop-rust

Supports deployment to:

• Coolify
• Fly.io
• Railway
• Any Docker-compatible platform

• PairDrop - Original project
• Snapdrop - Original inspiration

GPL-3.0