It's the gap between perceiving a stimulus (the screen turning green) and responding to it (the click). It includes the time for the signal to reach the brain, be processed and trigger the hand movement.
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Measure your reflexes in milliseconds: click the moment the screen turns green
This test measures your **visual reaction time**, the gap between the screen turning green and the moment you click. Each session has **5 rounds**, and the average of the five is what gives a reliable read on your reflexes (a single attempt varies too much). After you start each round, there's a random wait of 1.5 to 4.5 seconds (so you can't anticipate it) and then the screen changes color. The timer uses `performance.now()`, accurate to a fraction of a millisecond. The tool keeps your best time in the browser so you can track your progress.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/reaction-time-test"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Reaction Time Test"
></iframe>It's the gap between perceiving a stimulus (the screen turning green) and responding to it (the click). It includes the time for the signal to reach the brain, be processed and trigger the hand movement.