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SiteOne CrawlerInterroBot
Free

Free and open source.

 Freemium

A free Community Edition is available, with paid Plus and Pro upgrades.

Windows, macOS, Linux, Command line Windows, macOS, Linux, Android, iOS
  • Broad audit covering SEO, security, accessibility and performance
  • Both a desktop GUI and a scriptable CLI
  • Searches site content and filters CSS classes, scripts, image sources, HTTP details, and response times
  • Helps find HTTP errors and redirects
  • The large number of CLI options takes time to learn
  • Crawling large sites can put load on the target server
  • Some features require Plus or Pro licensing
Downloadable app Downloadable app
Open source Closed source
License not stated License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.