Reaction Tester is a simple Android app designed to test your reaction time.

Instructions: Hold your phone with one hand and use a finger on your other to touch the 5 randomly spawning buttons as they appear. The time from the moment the button spawns to the moment you click on it is measured in milliseconds.

Your reaction time is based on how quickly you can see and react to the buttons as they spawn in random locations on your screen.

Your best and average reaction times will be displayed on screen.

Below 300 m/s: Exceptional
Below 445 ms: Good
Below 550 ms: Average
Above that: Seek improvement