Reaction Time Test
Wait for the screen to change, then click as fast as you can.
Ready.
Every test runs inside your browser. Nothing you type, say, show or press is uploaded.
How to use this test
The reaction time test measures how quickly you respond to a color change. The box turns green after a random delay; you click as fast as you can. Five rounds give you an average and a median in milliseconds, with a note on how that compares with typical results.
Click the box to begin, then wait. When it turns green, click as quickly as you can. If you click before the green, that round is discarded and you try again. After five valid rounds the test shows your average and median.
What the results mean
The verdict uses your median, so one distracted round doesn't drag it down; the average is shown as well. A median around 270 ms is typical for an adult on a mouse. Under 200 ms is excellent, and over 300 ms is slow but common on a laptop touchpad or a phone. Monitor refresh rate, input lag and tiredness all add to the number.
Common questions
Is a reaction time below 200 ms possible?
Yes, but it's rare and it depends on the setup. A high-refresh monitor and a wired mouse remove a few tens of milliseconds compared with a laptop touchpad.
Why is the delay before green random?
So you can't time the click. The wait is different every round; clicking before the change counts as a false start and the round is repeated.
Does this measure my monitor or me?
Both. Your number includes the time the screen takes to show green and the time your mouse takes to report the click. To compare days or setups fairly, use the same hardware each time.