Pricewatch

A price and stock monitoring SaaS. Paste a product URL, set a target price, and get an email when it drops or comes back in stock. Free tier plus a paid Pro plan.

Live demo: add your Vercel URL here

Features

• Email magic-link and Google sign in (Supabase Auth)
• Add product monitors with an optional target price and CSS selector
• Background Python worker that scrapes prices on a schedule and stores history
• Email alerts on price drops and restocks (Resend)
• Monthly subscription with Stripe (Free: 3 monitors / daily, Pro: 30 / hourly)
• Per-user data isolation with Postgres Row-Level Security

Architecture

• Web app (/src): Next.js (App Router, TypeScript) + Tailwind. Dashboard, auth and Stripe billing. Deployed on Vercel.
• Worker (/worker): Python job that does the scraping and alerting. It uses httpx + BeautifulSoup, with Playwright as a fallback for JavaScript pages, and a layered price parser (JSON-LD, then meta tags, then CSS selector). Scheduled by GitHub Actions (.github/workflows/check-prices.yml).
• Supabase: Postgres + Auth + RLS. The worker connects with the service-role key; the web app uses the anon key scoped by RLS.

Getting started

See SETUP.md. Short version:

cp .env.example .env.local   # fill in Supabase + Stripe
npm install
npm run dev                  # web app at http://localhost:3000

cd worker                    # the scraper
pip install -r requirements.txt
cp .env.example .env         # fill in Supabase (+ Resend for emails)
python check_prices.py