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Why use separate tools to test web pages when you only need one? Total Validator performs the most important tests on web pages: HTML, ARIA, and CSS testing against published W3C and WHATWG specifications; accessibility testing against the WCAG and US Section 508 guidelines; spell checking using one of five languages; and testing for broken links. Note that this Test version only outputs a summary. Get the Basic version for detailed results, or the Pro version for testing whole websites and more. Why test these areas ... Search engine robots/spiders are very fussy and will not search or index some or all of a site if they come across invalid HTML, so if you want to be properly listed you need to be sure your HTML is valid. Just because you can use a website doesn't mean that someone with a disability can. You should ensure websites conform to accessibility guidelines, (that also means strictly validated HTML) and use ARIA correctly, if you want the site to be accessible to all. Spelling is often left unchecked and will make your site look and feel unprofessional and even unusable. Broken links are the bane of every webmaster, you may get your internal links correct, but external sites tend to change all the time, and there's nothing that makes your site look worse than a link to nowhere. So you need to regularly test your site for broken links. Note that this Test version is only designed so you can see if you have a lot of issues and decide whether or not to upgrade to the Basic or Pro versions to identify where the issues are to help fix them.