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SiteOne CrawlerCheckbot
Free

Free and open source.

 Freemium

Free to install, with Checkbot Pro from $10 per month.

Windows, macOS, Linux, Command line Browser extension
  • Broad audit covering SEO, security, accessibility and performance
  • Both a desktop GUI and a scriptable CLI
  • Crawls hundreds of pages at once
  • More than 50 SEO, speed and security checks
  • The large number of CLI options takes time to learn
  • Crawling large sites can put load on the target server
  • Chrome only
  • Some features require a paid plan
Downloadable app Browser extension
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 September 23, 2026

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