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SiteOne Crawler vs Asqatasun: catalog facts
SiteOne Crawler	Asqatasun
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux, Command line	Self-hosted
Broad audit covering SEO, security, accessibility and performance Both a desktop GUI and a scriptable CLI	Audits whole sites, not just single pages API for use in continuous integration
The large number of CLI options takes time to learn Crawling large sites can put load on the target server	Rules follow the French RGAA standard Requires running your own server
Downloadable app	Self-hosted
Open source	Open source
License not stated	License not stated
No account needed	Not stated if an account is 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 24, 2026

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