Watchdog - Web Page Change Monitor

About

Stop refreshing pages manually. Watchdog monitors any web page for changes and alerts you the moment something updates - prices, stock availability, content drops, scores, or anything else you care about.

  How it works:
  Pick any element on any website with a single click. Watchdog watches it for you and sends a desktop notification the instant it changes. No setup, no configuration, no account needed.

  Key Features:

  • Point-and-click element picker - no CSS selectors needed, just click what you want to watch
  • Content & Visual comparison - detect text/DOM changes or pixel-level screenshot differences
  • Instant detection - changes caught in real-time via DOM observation
  • Scheduled checks - poll at custom intervals (15s to 5min) for dynamic content
  • Persistent watchers - auto-restore on page load, even after browser restart
  • Background monitoring - check pages in hidden tabs without keeping them open
  • Change history - timestamped log of every detected change
  • Full dashboard - manage all your watchers and review changes in one place
  • Desktop notifications - with smart cooldowns to avoid notification spam
  • Multi-watcher support - track multiple elements across different pages simultaneously

  Use cases:

  → Track price drops on product pages
  → Monitor job boards for new listings
  → Watch for restocks on sold-out items
  → Follow live scores or election results
  → Detect website outages or content updates
  → Keep tabs on competitor pages

  100% local & private. All data stays in your browser. No external servers, no analytics, no tracking, no account required. Your browsing data never leaves your machine.

  Open source. Watchdog is fully open source - inspect the code, contribute, or report issues on GitHub: https://github.com/Osama-Yusuf/watchdog

  Lightweight, fast, and built on Chrome's Manifest V3 for security and performance.