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Rocket Validator vs SiteOne Crawler: catalog facts
Rocket Validator	SiteOne Crawler
Paid Paid subscription service with a free trial.	Free Free and open source.
Web	Windows, macOS, Linux, Command line
Site-wide HTML and accessibility checks in one report Up to 5,000 pages per report	Broad audit covering SEO, security, accessibility and performance Both a desktop GUI and a scriptable CLI
Paid service after the trial Requires an account	The large number of CLI options takes time to learn Crawling large sites can put load on the target server
Hosted service	Downloadable app
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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