Ahrefs is a service focused on backlinks. It has its own crawl engine, like Majestic, and will display very detailed reports about the link profile of any website. You can view the web pages that are linking to you, referring IPs and domains, backlinks bt TLD (.com, .edu, .gov), dofollow vs nofollow, anchor terms. Also, it displays social metrics.
The application displays very intuitive charts, you can filter and export the information.
It displays organic keywords, the evolution of website traffic and top competitors.
This is the main ability of this service and it is doing it very well. Ahrefs will discover and report a lot of links, so you will have a complete image of backlink profile for any website. Furthermore, you can view lost links and the broken ones, so you can take action to recover/fix them.
You can export backlinks data to CSV.
Ahrefs will report a huge quantity of links for any domain with an intuitive interface. New, lost and broken links are powerful features that will help you to increase your SEO performance for your sites.