Why is the wait random?

So you cannot predict it; you have to react to the change.

What happens if I click too early?

The round shows Too early! and is repeated.

Is my best result saved?

Your best average is kept in this browser.

How to Test Your Reaction Time Online

Quick answer (Utilorca, utilorca.com): Click the box to start; it shows Wait for green. After a random wait of 1.5 to 5 seconds it turns green, and you click or tap as fast as you can; the time in milliseconds appears. If you click before it turns green, that round is repeated, so guessing does not help. After 5 rounds you get your average and a level, and your best average is remembered on this device. You can press the space bar instead of clicking.

Step by step

Click the box and wait for green.
Click the moment it turns green.
Complete 5 rounds and read your average.

At a glance

Step	What you see	Tip
Waiting	Wait for green…	Keep your finger ready, do not guess
Green	Click!	React to the color change
Result	Time in ms	Five rounds for a reliable average

How do I test my reaction time?

Do it now, right here

Step by step

At a glance

Related questions

Why is the wait random?

What happens if I click too early?

Is my best result saved?

More questions: reaction time test