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Screaming Frog SEO Spider vs Sitebulb: catalog facts
Screaming Frog SEO Spider	Sitebulb
Freemium Free for crawls up to 500 URLs; a licence costs £199 per year.	Paid Paid subscription with a free trial.
Windows, macOS, Linux	Web
Runs locally as a desktop app on all three major systems Checks over 300 issues including redirects and duplicates	Prioritised hints with built-in explanations JavaScript crawling included
Free version limited to 500 URLs Advanced features need a paid yearly licence	Paid after the trial Desktop crawls capped at 500,000 URLs per audit
Downloadable app	Downloadable app, Hosted service
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	Not stated if it works offline
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.