Reaction Timer

Reaction Timer is a simple application you can use to test your reaction type using the keyboard. It starts counting randomly and asks you to press the spacebar as soon as this happens, in order to record the difference between the start and press time. It features intuitive options that even inexperienced users can quickly figure out.

Portable utility with a simple GUI

The entire program's wrapped into a single .exe file that can be copied anywhere on the disk or moved to a USB flash drive to fire it up on any machine without any setup. It doesn't change the system registry settings, need DLLs or other components to work, or generate files on the computer without asking for your permission. To get rid of it, you just have to delete this file.
As far as the GUI is concerned, Reaction Timer has a single window that shows a button, timed value, status bar, and a small area for entering the maximum period before starting the countdown arbitrarily (in seconds).

Test your reaction time by pressing spacebar

Once you trigger the timer with one click, the application starts counting randomly and plays a beeping sound to notify you to press the spacebar as soon as you can. The countdown stops after this action is performed, and you can find out your reaction time in seconds and milliseconds.
In the following step, you can either exit the program or start a new countdown. Unfortunately, Reaction Timer doesn't implement features for recording reaction time to give you an idea of your progress between different sessions.

Evaluation and conclusion

The app may seem rudimentary but it's straightforward and easy to use by anyone interested in calculating their reaction time in a distraction-free environment without complex customization preferences. CPU and RAM usage was minimal in our tests.