Compare software

Semrush Site AuditSiteOne Crawler
Freemium

A limited free crawl is available; larger audits require a paid Semrush plan.

 Free

Free and open source.

Web Windows, macOS, Linux, Command line
  • Issues ranked by severity with fix suggestions
  • Covers AI search visibility as well as classic SEO
  • Broad audit covering SEO, security, accessibility and performance
  • Both a desktop GUI and a scriptable CLI
  • The free crawl is limited
  • Full use requires a paid Semrush subscription
  • The large number of CLI options takes time to learn
  • Crawling large sites can put load on the target server
Web application Downloadable app
Closed source Open source
License not stated License not stated
Not stated if an account is needed No account needed
Needs internet 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.