KEEPoll is a real-time, interactive web and mobile classroom polling service. A KEEP user can set up free poll, and anyone can answer the poll using a web browser, the KEEPoll mobile application, or SMS. Responses and results can be viewed in real-time on the web and/or downloaded as CSV or Excel file. Teachers can use self-designed polls to facilitate classroom discussion, thereby creating a more interactive classroom, arousing students' learning interest, and improving student's engagement.