Build a multiplayer game
in under an hour.
Lobbii is rooms, matchmaking, WebRTC signaling, and TURN relays for games on any engine — browser, Godot, Unity, Unreal, native. You don't read these docs; your AI does. Paste one prompt into Claude, Cursor, or ChatGPT and it builds the whole multiplayer client for your stack.
Three steps
- 1.Create a project and copy your API key. No payment, no configuration — the key alone is a complete setup.
- 2.Copy the AI prompt below (or the key-included version from your dashboard) and paste it into your AI coding tool. Tell it your engine.
- 3.Run what it builds. Rooms, join codes, peer-to-peer data channels, relay fallback for hostile networks, and self-healing reconnection — all included.
Connections that survive
STUN, self-hosted TURN, and Cloudflare TLS relays on port 443 — corporate Wi-Fi, campus networks, and cellular all connect. Recovery ladder built into the prompt: ICE restarts, then full renegotiation with fresh relays.
Any engine, one protocol
Plain HTTP/JSON signaling plus an optional WebSocket push channel. The same spec drives browser TypeScript, GDScript, C#, C++, Swift — the AI writes the idiomatic version for yours.
Zero required setup
No accounts for your players, no OAuth for you. Optional hardening (origin allowlists, attestation, token enforcement) exists when your game is big enough to need it.
Prefer reading the wire spec yourself? It's at /docs/protocol. Pricing is free to start, $5/mo when you grow.