With this App it is possible to visualize, if the own Smartphone can handle a certain Display Refresh Rate or not. It shows the current Frame Rate as well. You can choose to test the refresh rate against 60, 90 and 120 Hertz / Hz. If the smartphone is capable of the selected refresh rate, then all LEDs will continuously and smoothly light up one after the one. If the smartphone has a problem with a certain refresh rate, some LEDs might remain yellow or even red. A yellow LED means the frame wa