About the test
This tool is designed to measure your reaction time, but the results should be taken with a grain of salt.
Reaction times can vary by device depending on the latency of your computer and monitor. Using a fast computer and a low latency/high framerate monitor can enhance your score (e.g., you'd likely get a lower reaction time with a 240hz gaming monitor as opposed to a 60hz iPhone screen).
Check out more details on the statistics page if you're curious. While the average human reaction time is generally between 200-250ms, your device may add an additional delay. This delay is usually between 10-50ms on most devices, but can sometimes be as much as 200ms (e.g., if you're using an old TV).