The paper analyses LimeSurvey, Google Forms, and KwikSurveys web services which allow unlimited free creation of many different online forms. The author of the paper works as a high school teacher of informatics and has used all three of these web services for different purposes, e.g. creating applications, quizzes for learning informatics, and online exams. Based on the same criteria these thee web services are compared. At the end of the paper the author recommends which of them to use in certain situations and for different purposes and analyzes how difficult it is for teachers to use these services.