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Netpeak Spider vs Ahrefs Free: catalog facts
Netpeak Spider	Ahrefs Free
Paid Commercial software with a free trial.	Freemium Free for verified websites; paid Ahrefs plans add more tools and data.
Windows, macOS	Web, Browser extension
Dedicated crawler for technical SEO audits Runs as a desktop application	Technical site audit at no cost Backlink and keyword ranking data from Ahrefs' index
Paid after the trial Closed source	Requires an account and site ownership verification Full data for other people's sites needs a paid plan
Downloadable app	Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	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.