Compare software

Screaming Frog SEO Spider vs Semrush Site Audit: catalog facts
Screaming Frog SEO Spider	Semrush Site Audit
Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.	Freemium A limited free crawl is available; larger audits require a paid Semrush plan.
Windows, macOS, Linux	Web
Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates	Issues ranked by severity with fix suggestions Covers AI search visibility as well as classic SEO
Free version limited to 500 URLs Advanced features need a paid yearly licence	The free crawl is limited Full use requires a paid Semrush subscription
Downloadable app	Web application
Closed 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 23, 2026	Official website Full listing and sources Checked September 23, 2026

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