A fully open-source P2P mesh app for sharing text, code, notes, and files directly between browsers. No signup, no accounts, no database.
The Pain Point
You're sitting next to a colleague. You need to send them a 200MB video file.
Email? 25MB limit + compression
Drive/Dropbox? Need an account + files sit on their servers forever
WhatsApp/Telegram? Compresses media + stores everything on their servers
AirDrop? Apple-only, doesn't work half the time
USB? Who carries one anymore?
SCP/iPerf? Overkill for a quick share
ZeroRelay: Open a tab,drag the file. Done. Direct browser-to-browser. Nothing touches a server.
Demo
What's ZeroRelay?
A peer-to-peer mesh app where every browser connects directly to every other browser over WebRTC. The signaling server (Cloudflare Durable Object) only exchanges join/leave messages and ICE candidates - it never stores or even sees your messages, files, or avatars.
Each peer is its own database - everything lives in IndexedDB (Dexie) on your browser. When you share something, it's broadcast over WebRTC data channels directly to connected peers. There is no central storage. There is no cloud. Your data never touches a server.
Architecture
┌─────────────────┐
│ Cloudflare DO │ ← signaling only
│ (per room) │ (join/leave/ICE relay)
└────────┬────────┘
│
┌──────────────┼──────────────┐
▼ ▼ ▼
┌────────┐ ┌────────┐ ┌────────┐
│ Peer A │◄──►│ Peer B │◄──►│ Peer C │ ← WebRTC mesh
│(Dexie) │ │(Dexie) │ │(Dexie) │ (data channels)
└────────┘ └────────┘ └────────┘
Each browser stores its own copy of everything in IndexedDB. When you share something, it's broadcast to all connected peers over WebRTC data channels. The signaling server never sees your messages, files, or avatars.
For full architecture deep-dive, see ARCHITECTURE.md on GitHub.
Features
| Full P2P Mesh | Every peer connects directly to every other - no central relay |
| Zero Server Storage | No database, no logs, no message history on any server |
| No Signup or Accounts | Open the app, join a room - done |
| Share Anything | Text, code, notes, or files of any size |
| Password-Protected Rooms | Room-level passwords enforced by Cloudflare DO |
| Retention Per Item | Session, 5 min, 1 hour, 1 day, or forever |
| Open Source | MIT - fully auditable and self-hostable |
Important Note
| Peer Discovery | Works globally - anyone on the internet can see you in the room |
| Data Transfer | Works on same LAN - messages and files flow when peers are on the same network |
| Cross-Network | Not yet - needs a TURN server for symmetric NAT traversal |
Peer discovery goes through the Cloudflare DO (WebSocket over TCP) so it works anywhere. Data transfer uses WebRTC which needs STUN/TURN to cross the public internet. Currently STUN-only. TURN support and contributions are welcome:)
Tech Stack
| Layer | Choice |
|---|---|
| Frontend | Next.js 15 + React 19 |
| State | Zustand (in-memory + localStorage persist) |
| Persistence | Dexie v4 (IndexedDB) |
| P2P Transport | WebRTC (full mesh topology) |
| Signaling | Cloudflare Workers + Durable Objects |
| Styling | Tailwind CSS v4 |
| Tooling | Biome, TypeScript, Husky |
Why Open Source?
Transparency - anyone can audit exactly what the server does (and doesn't) store
Self-host - deploy your own signaling worker if you want
Links
GitHub: https://github.com/kushal1o1/ZeroRelay
Landing Page: https://0relay.vercel.app/landing
Live Demo: https://0relay.vercel.app
Architecture Deep-Dive: ARCHITECTURE.md
README: README.md
MIT License