This thesis contains a description of a software process, the result of which is a web application. It records data about the movement of the eyes across the screen and in real time creates temperature maps from them. Data can be exported to an image or by machine readable form. With the help of a secure administration interface, it enables create datasets that can be distributed to other users. It is part of the job analysis of existing solutions, system design, implementation description, evaluation testing and suggestions for future improvements.