Real-time multiplayer
Real-time group mechanics
A multiplayer engine where guests join from a link — no app, no account, five seconds.
The system
Server-authoritative state for fast group sessions. Participants arrive by unguessable link, claim a name, and are participating in seconds. The host carries the only install; everyone else gets the fun part in the browser.
The joining moment is the product and the growth loop at once, so it was engineered like one: zero accounts, zero friction, capacity and finality arbitrated transactionally on the server.
The hard parts
Trustworthy without accounts
Unguessable links plus server-side arbitration make guest sessions safe — no client is ever the referee.
AI-seeded content
Sessions can be generated from a prompt, complete with editorial copy, then finished with a rendered, shareable recap.
Thirteen days to the full loop
Create, invite, run live, reveal, recap — the entire loop shipped in thirteen days of building.
In numbers
Flutter · Next.js · Firestore · server functions
Happy to walk through this one properly — what it does, how it's put together, and what it would take to build something like it for you.