Product comparison
Accessibility validation
      ✔
      ✔
      ✔
      ✔
    HTML validation
      ✔
      ✔
      ✔
      ✔
    Broken link check
      ✔
      ✔
      ✔
      ✔
    Spell checker with language detection
      ✔
      ✔
      ✔
      ✔
    Check for mixed content
      ✔
      ✔
      ✔
      ✔
    Check local pages and intranets
      ✔
      ✔
      ✔
      ✔
    Windows, macOS and Linux versions
      ✔
      ✔
      ✔
      ✔
    Over 40 UI themes
      ✔
      ✔
      ✔
      ✘
    Test DOM generated source
      *
      *
      ✔
      ✔
    CSS validation
      
      
      ✔
      ✔
    Check whole website in one go
      
      
      ✔
      ✔
    Check multiple websites in one go
      
      
      ✔
      ✔
    Check specific parts of websites
      
      
      ✔
      ✔
    Check authenticated websites
      
      
      ✔
      ✔
    Works with forms
      
      
      ✔
      ✔
    Select tests
by site, by page, by item
      
      
      by site, by page, by item
✔
      ✔
    Check pages behind proxy servers
      
      
      ✔
      ✔
    Comprehensive spelling options
      
      
      ✔
      ✔
    Spell check in other languages
      
      
      ✔
      ✔
    Personal dictionaries
      
      
      ✔
      ✔
    Comprehensive reporting options
      
      
      ✔
      ✔
    Comprehensive link options
      
      
      ✔
      ✔
    Cookie handling
      
      
      ✔
      ✔
    Change user agent
      
      
      ✔
      ✔
    Command line operation
      
      
      *
      ✔
    Web API
      
      
      
      ✔
    Headless operation
      
      
      
      ✔
    Extra options for managing results
      
      
      
      ✔
    * Limited operation.
Please see the online documentation for full details of the features available with each product and how best to use them.