dislike404.com

dislike404.com is a free website monitoring service that automatically and regularly scans your websites for technical issues. It detects a range of problems, including HTTP errors like 404 (Not Found) or 500 (Internal Server Error), connection timeouts and external dead links. Users can register for an account, add their websites to the dashboard, and will receive email notifications whenever issues are detected, based on their alert preferences. The primary aim of the service is to proactively identify outages and errors at an early stage, helping to prevent negative effects on user experience and search engine rankings before they occur.

Features:

• Automated error scans of your website
• Adjustable scan interval
• Email notifications
• Custom scan filter
• Manual scan initiation
• High limits (50k pages) for verified websites
• A tool made by webmasters, for webmasters. It respects your server with adjustable crawl speeds and honors robots.txt

As dislike404.com is completely free, simply signup and try it out. I would really appreciate your feedback. Thank you :)