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SiteOne Crawler vs Screaming Frog SEO Spider: catalog facts
SiteOne Crawler	Screaming Frog SEO Spider
Free Free and open source.	Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Broad audit covering SEO, security, accessibility and performance Both a desktop GUI and a scriptable CLI	Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates
The large number of CLI options takes time to learn Crawling large sites can put load on the target server	Free version limited to 500 URLs Advanced features need a paid yearly licence
Downloadable app	Downloadable app
Open source	Closed 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
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.