Compare software

Screaming Frog SEO SpiderSiteOne Crawler
Freemium

Free for crawls up to 500 URLs; a licence costs £199 per year.

 Free

Free and open source.

Windows, macOS, Linux Windows, macOS, Linux, Command line
  • Runs locally as a desktop app on all three major systems
  • Checks over 300 issues including redirects and duplicates
  • Broad audit covering SEO, security, accessibility and performance
  • Both a desktop GUI and a scriptable CLI
  • Free version limited to 500 URLs
  • Advanced features need a paid yearly licence
  • The large number of CLI options takes time to learn
  • Crawling large sites can put load on the target server
Downloadable app Downloadable app
Closed source Open source
License not stated License not stated
No account needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked September 24, 2026

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