Website auditors are usefull and handy tools designed to find and identify problems that may have a negative impact on your website performance. ranking, and usability. Test results varies across the different auditing tools, but you can learn things about your site that you probably were'nt aware of, and get suggestions on how to fix them.
The tools provided her are a selected few from the many website auditing and analysis tools found on the web. You can use them to audit and analize your website and take steps to fix any problems you discovered.