Compare software

SiteOne CrawlerSitebulb
Free

Free and open source.

 Paid

Paid subscription with a free trial.

Windows, macOS, Linux, Command line Web
  • Broad audit covering SEO, security, accessibility and performance
  • Both a desktop GUI and a scriptable CLI
  • Prioritised hints with built-in explanations
  • JavaScript crawling included
  • The large number of CLI options takes time to learn
  • Crawling large sites can put load on the target server
  • Paid after the trial
  • Desktop crawls capped at 500,000 URLs per audit
Downloadable app Downloadable app, Hosted service
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.