Website Change Detector

This tool allows you to monitor a list of websites for structural changes. It calculates a 'fingerprint' (a hash) of a page's HTML structure and compares it to the last known fingerprint. If they differ, the tool flags the page as 'Changed!'.

All data, including the list of URLs and their structural fingerprints, is stored exclusively in your browser's Local Storage. No data is sent to or stored on any external server, ensuring your privacy.

Yes, it is designed to be safe. No script execution: The app treats the fetched HTML as plain text. Any potentially malicious JavaScript (<script> tags) or other active content within the page is never executed. No direct connection: Your browser does not connect directly to the target URL. All requests are routed through a secure, third-party CORS proxy, which acts as a middleman.

A structural change means the arrangement of HTML tags has been altered (e.g., a <div> is added or removed). The tool ignores changes to text content, CSS styles, or tag attributes, focusing only on the architectural 'blueprint' of the page.

Not Found: The server responded with a 404 error, or the page content contains common 'Page Not Found' phrases.
Offline: The app could not establish a connection to the server.
Error: An unexpected issue occurred, such as the server responding with an error code other than 404.