EN
Despite the rapidly growing popularity of browser games there is still little research on them, mainly because of problems with methodology. In quantitative studies, the basic problem is how to measure and compare the popularity of these games. The paper presents all the usually applied measures: from the most popular 'number of players', through active accounts, online (users logged in), ending with unique visitors. Their advantages and disadvantages will be analyzed. The model of acquiring players through browser games, the bounce rate and returning visitors will be explained. And finally, based upon the fact that browser games are a type of internet page, tools that allow access to the data describing the popularity of these games (and often other statistical parameters, too), the statistical systems, AdPlanners, toplists, Alexa and Wolfram will be presented and analyzed.