Reaction time test
The reaction time test is a simple online tool with which you can measure your reaction speed. This reaction test is not very scientific, but it is very suitable for fun and approximate comparison with friends. You can use it on your computer or smartphone, it's mobile friendly.
How to measure reaction time with this test
There is one big rectangle on the page. Click it first to start.
Wait and click again once the color of the rectangle changes to green. After that you’ll get your reaction time in milliseconds.
The time between “Wait” and “Click” messages is random from 1 to 5 seconds each time, so you won't be able to adjust to the countdown.
If you click too early, the result will not be counted and you will have to start over the reaction test.