One of the best tools for traffic measurement is Google Analytics, which has features such as real-time activity reporting and user exploration. The basic version is free, but you can gain advanced features on a premium subscription.   Other useful tools include Ahrefs, Similarweb, Semrush and Sitechecker.   Before you splurge on high-level traffic measurement tools, check if your web host provides any. For example, Bluehost provides AWStats and Webalizer to help you monitor your visitor stats.