Ahrefs combines a backlink database, keyword research, site audits, rank tracking and content research. It is one of the two most widely used SEO suites, and its link data is a common reference point in the industry.
Paid plans. Free Ahrefs Webmaster Tools for sites you own.
Who it suits: Link building, competitor research and agencies that need reliable backlink data.
What we like
- Very large, frequently updated backlink index
- Clean, fast interface
- Strong competitor research
Watch out for
- Expensive for solo users
- Usage limits on lower plans




