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Ahrefs Free vs Sitebulb: catalog facts
Ahrefs Free	Sitebulb
Freemium Free for verified websites; paid Ahrefs plans add more tools and data.	Paid Paid subscription with a free trial.
Web, Browser extension	Web
Technical site audit at no cost Backlink and keyword ranking data from Ahrefs' index	Prioritised hints with built-in explanations JavaScript crawling included
Requires an account and site ownership verification Full data for other people's sites needs a paid plan	Paid after the trial Desktop crawls capped at 500,000 URLs per audit
Web application, Browser extension	Downloadable app, Hosted service
Closed source	Closed source
License not stated	License not stated
Account 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.