Corona Virus has been designated by WHO as a global pandemic on Thursday, March 12, 2020. In the middle of the 2019/2020 semester, learning process has been changed from offline to online learning through various platforms including Vinesa, Whatsapp Group, Google Classroom, Zoom, Google Meet, and others. The decision support system with the intuitionistic fuzzy method is used to select the best learning application that supports online learning based on questionnaire data for students of the UNESA in Mathematics department. The results of data analysis using intuitionistic fuzzy topsis shows that the relative proximity coefficient (Ci * ) for the use of the Zoom platform has the highest value, that is 0.749, followed by Google Meet 0.320, Google Classroom 0.304, Whatsapp Group 0.303 and Vinesa 0.227. It can be concluded that the use of zoom in online learning is most in demand by students of the Mathematics Department of UNESA.