Device compatibility testing is performed after the mobile application development phase or before the application is presented to users. With the device compatibility test, different test scenarios are created and it is aimed to increase the efficiency of the mobile application offered to the user and to meet the quality requirements. Device compatibility test is applied considering device type, screen sizes, operating systems, network connections, operators and compatibility criteria variables. With the mobile application device compatibility test, the functionality, quality, usability and performance of the application are tested. Thus, it is aimed that the mobile application reaches users in the most seamless and error-free way.