The aim of the thesis is to create a web application that allows a user (yoyo contest judge) to analyze and potentially improve their evaluation skills. In the theoretical part, the student will review existing options supporting yoyo judges. Futhermore, the student will also discuss technological options and choose suitable solutions for the implementation. In the applied part, the student will analyze, design and implement fully functional web application. The minimum functional requirements are as follows: account management, importing videos, test sessions management, analytical functions (timestamps, comparative functions), visualization function (scoring). Application will be tested by target end-users (yoyo judges).