In modern societies, Indoor Environmental Quality (IEQ) has been proved to be a significant index for classrooms and workplaces, as it indicates quantities that directly relate to comfort and efficiency. A user interface with higher readability and accessibility can play a significant role throughout the feedback loop for such a platform. Prometeo is a multi-sensor system that excels in monitoring IEQ data that are strongly connected to human comfort in a crowded open environment (e.g., classroom) and processing the feedback from users. During this thesis, works have been put into the development of a user-friendly interface on mobile devices; through it, the system can include an effective and efficient procedure for users to view data streams transmitted from the system, provide feedback, and maintain a profile on mobile devices such as phones and tablets.