In simple English
This tool watches websites for you and tells you when they change. You can track pricing pages, product updates, or competitor blogs without checking them by hand. It sends alerts to your email, Slack, or webhook when something updates. It runs on your own server and uses an external web scraping service. You will need a free API key and some technical skill to set it up.
What it is
A self-hosted website monitoring application built with Next.js and TypeScript. It uses a background worker to scrape pages on a schedule and compare them against older versions.
What it is good for
Solo builders who want to track competitor pricing changes, product releases, or documentation updates without writing custom scraping scripts.
- Tracks site links, page content, and product prices.
- Sends clean visual diffs so you can see exact line changes.
- Filters out routine noise using optional artificial intelligence.
- Requires a running PostgreSQL database and a background worker process.
- Depends on an external scraping API for page data.
- Needs Docker and command-line knowledge for local setup.
Writing custom cron jobs with curl and diff to check for page updates.
PostgreSQL (for storing snapshots and alerts).
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git clone https://github.com/context-dot-dev/webdog.git cd webdog npm install cp .env.example .env npm run db:up npm run db:push npm run dev