
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.
Competitor Backlinks suits operators and solo marketers who want to identify referring sites shared by competitors but not their own site. It offers a free check alongside paid reports and link-building services.