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Ahrefs Free vs Netpeak Spider: catalog facts
Ahrefs Free	Netpeak Spider
Freemium Free for verified websites; paid Ahrefs plans add more tools and data.	Paid Commercial software with a free trial.
Web, Browser extension	Windows, macOS
Technical site audit at no cost Backlink and keyword ranking data from Ahrefs' index	Dedicated crawler for technical SEO audits Runs as a desktop application
Requires an account and site ownership verification Full data for other people's sites needs a paid plan	Paid after the trial Closed source
Web application, Browser extension	Downloadable app
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.