Ahrefs

Ahrefs is known as the world's largest index of live backlinks and the ultimate website analysis toolset that is trusted by thousands of SEOs and Integrated Marketing Professionals worldwide. Emerging as one of the alternatives to Yahoo! Site Explorer after its shutdown on November 21, 2011; Ahrefs has taken site explorer and backlink analysis to a whole new level with their highly sophisticated toolset including Site Explorer and Backlink Checker, SEO Reports, Mentions Tracker, Social Metrics, Batch Analysis and Domain Comparison. Ahrefs has built their own crawler that indexes billions of pages daily. Today, Ahrefs's proprietary technology allows their index to update data every 15 minutes and to capture over 1.5 trillion unique external backlinks. Core value lies in big data, Ahrefs's goal is to provide both businesses and individuals with the most extensive and quickly updated databases of live backlinks available. Since its inception in 2011, Ahrefs has built a strong international user base and continuously listened to users' feedbacks and thrived to build an easy-to-use tool, easy-to-read data visualization, and digestible data exports in the most friendly formats so that Ahrefs' users can effectively and effortlessly exceed their SEO goals, as well as their link building and content marketing strategies. Account registration is free and Ahrefs is available at three subscription plans with pricing starting at $79 per month.