Reaction Time is a free Android application developed by Hackman that allows users to measure their reaction time to the nearest millisecond. This app uses a novel hold-and-release system combined with trials to provide accurate results.

To use the app, simply press and hold your finger on the screen. When the screen turns green, lift your finger up as quickly as possible. Complete five trials to get a final average of your reaction time. It is important not to lift your finger early, as this will cause your current run to be reset.

Overall, Reaction Time is a straightforward and convenient way to test your reaction time. The app is easy to use, and the results are presented in a clear and concise manner. Whether you're looking to improve your reaction time or simply curious about your abilities, Reaction Time is definitely worth a try.