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SEOptimer vs Ahrefs Free: catalog facts
SEOptimer	Ahrefs Free
Freemium Free single audits; white-label reports and the full toolset need a paid plan with free…	Freemium Free for verified websites; paid Ahrefs plans add more tools and data.
Web	Web, Browser extension
Instant audit from a single URL Prioritised, plain-language recommendations	Technical site audit at no cost Backlink and keyword ranking data from Ahrefs' index
Report branding and deeper features are paid Scores are a summary rather than a full crawl	Requires an account and site ownership verification Full data for other people's sites needs a paid plan
Web application	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Needs internet	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.