Ahrefs SEO and Content Platform

Ahrefs is a comprehensive SEO and content marketing platform providing tools for keyword research, competitor analysis, backlink tracking, and site auditing. Founded in 2010 by Dmitry Gerasimenko in Singapore, the company has grown to serve over 600,000 users. Ahrefs operates its own web crawler (AhrefsBot), the second most active crawler after Google, and maintains one of the largest backlink indexes in the world with over 35 trillion known links updated every 15-30 minutes. Key features: Site Explorer: analyze any website's organic search traffic, backlink profile, and paid search ads. See estimated traffic, top keywords, referring domains, and competitor strategies. Keywords Explorer: discover keyword ideas with search volume, keyword difficulty score (KD), clicks per search, global volume across 10 search engines (Google, YouTube, Amazon, Bing, Baidu). Content Explorer: search a database of over 1 billion web pages for content ideas. Filter by organic traffic, social shares, domain rating. Site Audit: comprehensive technical SEO crawler identifying 100+ pre-defined issues affecting search performance. Crawl your site, get a health score, prioritize fixes. Rank Tracker: monitor your keyword rankings across 190 countries and multiple search engines. Daily, weekly, or monthly updates. Backlink analysis: detailed analysis of any domain's backlink profile. See new and lost backlinks, referring domains, anchor text distribution, domain rating (DR), and URL rating (UR). Alerts: get notified of new and lost backlinks, keyword ranking changes, and mentions of your brand. SEO toolbar: free browser extension showing SEO metrics for any page you visit. C++ for crawling. Proprietary.