Create a board, share a link, and let guests play without an account. Hosts sign in through String ID; Google login and MOE verification live there.
Use Node 22.12+ (Node 22 line). The app uses Vite/vanilla JS with a same-origin Express/Prisma API on Vercel. See setup, identity migration and verification and the maintained feature spec.
By @KOKHC @physicstjc — first developed on Claude.