Ahref is one of the most popular digital marketing analysis tools used for preparing the audit report, backlink analysis, URL rankings, competitive analysis and many more. 

It is used extensively for all purposes like SEO analysis. Apart from the SEO backlink analysis, for which it is well-known in the digital marketing field, it is also useful for keyword analysis and website rankings. 

Ahref uses the different SEO metrics to analyze and provide quantitative results for every website analysis done. About a year back, Ahref was also used to offer the free version. But today, that is not the case anymore.