Ahrefs is trusted by SEOs and marketing professionals worldwide as the ultimate toolset for SEO, powered by unique and the most complete data in the industry. Have a look here - https://ahrefs.com/big-data. Ahrefs crawls the world wide web, stores tonnes of data and presents it in a simple-to-understand user interface to enable marketers to make informed marketing decisions. Through continuous product refinements, we enable our customers to collect useful data on their competitors, implement keyword research, link building, content marketing and SEO strategies to accelerate their ultimate goal of growing search traffic to their websites.