Alexa AWS Notes - Curated Crawls Technical Info - IA Webteam Confluence. Quantcast - Home. AWStats Documentation - Log File analyzer comparison. * This number is not really the number of browsers detected. All browsers (known and unknown) can be detected by products that support user agent listing (AWStats,Analog,Webalizer,Sawmill). The 'browser detection feature' and number is the number of known browsers for which different versions/ids of same browser are grouped by default in one browser name. ** AWStats can detect robots visits: All robots among the most common are detected, list is in robotslist.txt (250Kb).
Products that are not able to do this give you false information, above all if your site has few visitors. For example, if you're site was submitted to all famous search engines, robots can make 500 visits a month, to find updates or to see if your site is still online. So, if you have only 2000 visits a month, products with no robot detection capabilities will report 2500 visits (A 25% error !).
*** AWStats has url syntax rules for the most popular search engines (that's the 'number detected'). Woopra - Website Tracking and Analytics.