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SiteOne Crawler vs Rocket Validator: catalog facts
SiteOne Crawler	Rocket Validator
Free Free and open source.	Paid Paid subscription service 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	Site-wide HTML and accessibility checks in one report Up to 5,000 pages per report
The large number of CLI options takes time to learn Crawling large sites can put load on the target server	Paid service after the trial Requires an account
Downloadable app	Hosted service
Open source	Closed source
License not stated	License not stated
No account needed	Account 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.