
Ahrefs
8.4#7 in seo toolsFrom $29 a monthFree planWebAPI
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Ahrefs suits people working on SEO, including keyword and competitor research, audits, and backlink analysis. Its higher plans add project, tracked-keyword, crawl-credit, and user allowances, while Enterprise includes administration and security controls.
It suits people researching keywords for SEO, paid search, niche marketing, or domain parking. The project tools and imports may help users organizing research from multiple sources.