Vercel Platforms Starter

[Platforms](https://github.com/vercel/platforms) is Vercel's official template for building a multi-tenant application, the kind of setup behind site builders and creator platforms. It demonstrates custom domains and subdomains per customer using Next.js middleware, so each tenant gets its own space at their own URL. The stack is the App Router, Tailwind CSS, and Redis-backed storage, all deployable to Vercel out of the box. Reach for this when your product needs to host many customers who each want branded, isolated sites.