Ahrefs
What is AHREFS?
Ahrefs.com is a well-known toolset for backlinks and SEO analysis.
They stand out from the herd of other similar services by the largest base of live links, huge Index and the best Speed of index updates. Constantly improving their algorithms to provide our customers with freshest and most actual backlinks data.
They keep up to date with new tendencies in the world of SEM and SEO and make sure these tendencies find their reflection in new features of Ahrefs.