VitaminD Explorer

Solar vitamin D calculator PWA — know when and where you can synthesize vitamin D from sunlight, based on solar elevation, real-time UV index, skin type, body exposure and age.

Live: https://getvitamind.app

Stack

Next.js (App Router) · next-intl (es/en/fr/de/ru/lt) · Tailwind CSS v4 · D3 · Supabase (auth, profiles, city search, push subscriptions) · Web Push · Vercel (hosting + daily cron).

Development

npm install
cp .env.example .env.local   # fill in values
npm run dev                  # localhost:3000

Quality gate (all must pass, enforced by CI on every push/PR):

npm run lint && npm run typecheck && npm test && npm run build

Docs

• AGENTS.md — architecture, deployment runbook, operational gotchas and incident history (CLAUDE.md imports it).
• docs/PRODUCTION_READINESS.md — production-readiness assessment and the practices that keep it that way.

License

MIT