StatCounter is a free yet reliable invisible web tracker, highly configurable hit counter, and real-time detailed web stats.
See your visitors’ location, IP address, browser, system stats, number of visits. Also, identify sales leads, return visitors, click fraudsters, nuisance visitors, and bots from the forensic level of detail available for each visitor.
Plan: Free to Try, Freemium Tool
Platform: Android, iPhone/iPad, Plugin, Web-based, Windows