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Ahrefs is the SEO toolset UK marketers trust for backlink analysis, keyword research, and content ideas. Its index of live backlinks is the largest in the industry, making competitor research fast and accurate. Pricing starts at $129/month (annual). It includes site audits, rank tracking, and Content Explorer. GDPR compliant with data processing terms. UK SEO professionals often choose Ahrefs over Semrush for link data; it's an investment that pays off for anyone doing serious organic growth, though casual users may find the cost hard to justify.