Ahrefs
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Backlinks, keywords and competitor research
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Screaming Frog
The technical SEO crawler
Free plan availableSEO & MarketingSince 2010
Custom pricingVisit screamingfrog.co.uk
What Screaming Frog is
Desktop crawler that maps a site's structure, redirects, metadata and broken links. Free up to 500 URLs; a licence lifts the cap.
People use it to
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Ongoing free tier published by the vendor. Limits vary by plan.
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