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SiteOne Crawler vs Semrush Site Audit: catalog facts
SiteOne Crawler	Semrush Site Audit
Free Free and open source.	Freemium A limited free crawl is available; larger audits require a paid Semrush plan.
Windows, macOS, Linux, Command line	Web
Broad audit covering SEO, security, accessibility and performance Both a desktop GUI and a scriptable CLI	Issues ranked by severity with fix suggestions Covers AI search visibility as well as classic SEO
The large number of CLI options takes time to learn Crawling large sites can put load on the target server	The free crawl is limited Full use requires a paid Semrush subscription
Downloadable app	Web application
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	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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