The WatchtowerData extension integrates directly into your browsing workflow. Add pages with one click, see live alerts as you browse, and jump to change diffs — without ever switching tabs.
Free with any WatchtowerData plan · Works with Chrome & Chromium-based browsers
Recent Alerts
Page Changed 3 minutes ago
Pricing updated — 2 sections modified
What It Does
The extension is a natural extension of WatchtowerData — use it as much or as little as you like.
Browse a competitor's site and click "Add to WatchtowerData" to start monitoring that page instantly — no copy-pasting URLs.
When you visit a monitored page, a subtle banner tells you if it's changed since the last check — and links directly to the diff.
See highlighted sections of the page that changed, overlaid on the live site. No need to guess what's different.
The extension shows your most recent alerts in a clean popup so you can jump directly to any change diff without opening the dashboard.
Monitors for price drops, new discount codes, and sale banners on competitor product pages and alerts you immediately.
The extension only activates on pages you explicitly add to WatchtowerData. It reads nothing else and sends no data to third parties.
Setup in Seconds
Click "Add to Chrome" from the Chrome Web Store. One click — no account needed yet.
Click the WatchtowerData icon in your toolbar and sign in with your existing account — or create one free.
Visit any page you want to track. The extension icon shows whether it's monitored.
Hit "Add Page" and WatchtowerData starts monitoring immediately. You'll get an alert on first change.
The extension works with any Chromium-based browser.
Chrome
Supported
Edge
Supported
Brave
Supported
Firefox
Coming soon
A WatchtowerData account is required to use the extension. All plans include full extension access.