WebSite-Watcher is a tool that allows users to monitor websites and track changes to their content. It can detect updates to websites, such as new articles, images, or videos, and alert users when they occur. It can also be used to bookmark websites, organize bookmarks into categories, and search for specific content. WebSite-Watcher can check websites for changes as often as every 10 minutes, or as infrequently as once a day. It can also be used to monitor changes to online books, magazines, and other publications. WebSite-Watcher also includes a browser extension, allowing users to quickly access their bookmarks from any website.
Only monitor website availability, not content.
UptimeRobot only monitors website availability, not content.
Discontinued The program is no longer updated. The latest version, 1.0.12, released in June 2012, can still be downloaded from the official website.
Simple, effective, versatile and works on all versions of Windows, including Win 10. It can detect all changes in the code / content of the web page, even if it is not visible in the browser. The only negative is that it does not work with sites with the prefix https: //.
Discontinued The program is no longer updated. The latest version, 6.1, released in January 2009, can still be downloaded from the official website.
UptimeRobot
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The website watcher monitors changes in the content of a web page's main uptimerobots function to verify whether a web page is inactive (i.e. unavailable), which is something else IMHO.