dr.serp.co shows any website's Ahrefs Domain Rating on a shareable page, serves an embeddable DR badge, and sells subscriptions for claiming and tracking domains. It is a Next.js app on Cloudflare Workers with D1.
cd apps/web
pnpm install
cp .dev.vars.example .dev.vars # local values; never put them in .env* files
pnpm db:migrate:local && pnpm db:seed:local
pnpm devAGENTS.md maps the code, the commands and the docs. The docs themselves are in docs/.