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Semrush Site Audit vs Sitebulb: catalog facts
Semrush Site Audit	Sitebulb
Freemium A limited free crawl is available; larger audits require a paid Semrush plan.	Paid Paid subscription with a free trial.
Web	Web
Issues ranked by severity with fix suggestions Covers AI search visibility as well as classic SEO	Prioritised hints with built-in explanations JavaScript crawling included
The free crawl is limited Full use requires a paid Semrush subscription	Paid after the trial Desktop crawls capped at 500,000 URLs per audit
Web application	Downloadable app, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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 23, 2026

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