Page Diff

See exactly what changed on any webpage since you started watching.

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 — Regulatory or legal: watch government or institutional pages for updates — Anything on the web you want to keep an eye on PRIVATE BY DESIGN Everything stays on your device. Screenshots are stored locally in your browser using Chrome'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 watch for the next change FEATURES — Visual diff with a draggable before/after slider — Side-by-side view with bounding boxes on changed regions — Watch up to 15 pages simultaneously — Flexible check frequency: on visit, every 5 minutes, hourly, daily, or any custom interval in minutes or hours — Inline rename: click any watch name to edit it — Change history: a log of past changes per watch, visible even after dismissing — Badge notification on the extension icon when changes are detected — System notification with one click to jump to the changed page — Checks run on your next visit when scheduled — never opens tabs on your behalf — Dark mode support — No login, no subscription, no external servers