Page Diff

About

Page Diff watches webpages and shows you exactly what changed — visually, not as a wall of code.

Navigate to any page, click Watch, and Page Diff takes a silent screenshot. The next time you visit, it compares the two and highlights every region that shifted. You see a before/after slider you can drag across the page, or a side-by-side view with colored boxes marking the exact areas that moved.

WORKS FOR
— Price tracking: catch a price drop or a sold-out item coming back in stock
— Job boards: see new listings appear on a company careers page
— News and content: know when a site publishes something new
— Competitive monitoring: track changes to a competitor's pricing or messaging
— Ticket availability: catch the moment a sold-out event reopens
— Anything on the web you want to keep an eye on

PRIVATE BY DESIGN
Everything stays on your device. Screenshots are stored locally s built-in storage. No account required. No data is ever sent to any server. No third party ever sees what you're watching.

HOW IT WORKS
1. Navigate to any public webpage
2. Click Watch this page and choose how often to check
3. Page Diff captures a visual baseline
4. When you return, it compares and highlights what changed
5. Dismiss to reset the baseline and start watching for the next

FEATURES
— Visual diff with a draggable before/after slider
— Side-by-side view with bounding boxes on changed regions
— Flexible check frequency: on visit, every 5 minutes, hourly, daily, or a custom interval
— Badge notification on the extension icon when changes are dete
— System notification with one click to jump to the changed page
— Watches up to 5 pages simultaneously
— Dark mode support
— No login, no subscription, no external servers