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Technology stack

GrapeVest is a frontend-first app (PWA) with an optional managed backend (BaaS).

Frontend​

  • Next.js 15 (App Router) + React 19 + TypeScript,
  • Tailwind CSS — styling, light/dark theme,
  • Zod — validation of all input data,
  • Web Crypto API — client-side end-to-end encryption,
  • PWA — manifest, service worker, install on your phone,
  • i18n — PL / EN / DE.

Backend (optional) — Supabase​

  • PostgreSQL — stores the household's (encrypted) state,
  • Supabase Auth — sign-in with a password,
  • Row Level Security + security definer functions — access logic in the database.

In local mode (no Supabase configured) the app runs entirely in the browser (data in localStorage).

Tests and quality​

  • Vitest + Testing Library — unit and component tests,
  • a full suite covering financial calculations, validation, migrations and crypto,
  • CI runs automatically.

Hosting​

  • App: Vercel,
  • Documentation (this site): Docusaurus → a static build on Vercel.