Web Standards Checks Get compliant - power up

Rank higher, do better.

Analyze your entire site for HTML/CSS validation, W3 accessibility standards, and web browser compatibility with Chrome, Edge, Firefox and Safari.

See how it works

  • WCAG Accessibility
  • Validate HTML
  • Validate CSS
  • Validate ARIA
Screenshot of SortSite report showing accessibility issues


Our customers include over 30% of the Fortune 100, and many of the world's largest organisations such as NASA, Disney, and UNICEF. Our products are used in more than 50 countries in every corner of the globe.

What it does

Rank higher in SEO searches, reduce maintenance time and costs, and increase accessibility through web standards compliance.

Check your website with SortSite, our web standards validator.

Evidence based accessibility

The app has consistently scored the best coverage in W3 ACT Rules implementation reports since 2019. It leads the field in government agency accessibility tool audits and is regularly cited in academic papers.

Screenshot of SortSite accessibility report

What it checks

SortSite validates every page on a site using the same technology as the WhatWG and W3C validators:

  • WhatWG and W3C HTML / CSS standards validation
  • Checks for WCAG accessibility standards
  • Checks for vendor-specific tags, attributes, and JavaScript
  • Checks for HTML / CSS which triggers browser bugs
  • Works on intranet / staging sites behind a firewall
  • Checks entire sites - not restricted to single pages like W3C validator

Plus, Professional edition features:

  • Finds vendor-specific tags, attributes, and JavaScript
  • Finds HTML / CSS features that trigger bugs in major browsers
  • Checks against search engine content guidelines to ensure your site has optimum search rank

To aid enforcement, SortSite tracks issue counts over time using a dashboard which drills down to individual errors and lines of code.

Key Facts

524 million

Pages scanned

2 million

Sites tested


of Fortune 100 are customers


Countries using our product

Powered by Simplicity


Start Scan

Just enter your web address and click Start Scan. Our tool will crawl your entire site to find evidence-identified issues.


See Report

Once complete, we'll send you a full report that clearly shows you which problems you have, what pages they're on, and where code is affected.


Get Compliant

Your journey starts now. Using our findings, you can work towards creating a better site.

SortSite is an automated tool that scans your website for device compatibility and accessibility. Bonus: It also checks for search engine optimization (SEO), broken links, and secure connections.

SortSite is a tool that stood out to us and gave us good results. To date we have scanned multiple applications at DOH and the results have been informative and helpful in assessing the accessibility and assisting us with what to fix.

This simple test works very similarly to the desktop browser test, but gives much more useful data than just a screenshot. The "SortSite" test checks accessibility, broken links, browser code compatibility, search engine optimization and other usability issues...

Ready to Get Started?

Scan your site with a 30-day free trial

Get started