Reaction Time Test

How to play: click the panel to begin, wait for it to turn lime, then click, tap or press SPACE as fast as you can. You get 5 tries and your average is your score.

This free reaction time test measures how quickly you respond to something you see. The panel waits a random amount of time, turns lime, and times the gap between that change and your click in milliseconds. Five tries are averaged, because a single lucky or unlucky attempt says very little about how fast you really are.

The test runs in your browser with nothing to install. It works with a mouse, a trackpad, a keyboard or a touchscreen, and it keeps your best average on this device so you can see whether you are improving.

How the reaction time test works

1. Click or tap the panel, or press SPACE, to start a try.
2. The panel turns dark red and shows “Wait for lime”. Keep still.
3. After a random delay of between 1.5 and 5 seconds, the panel turns lime.
4. React as fast as you can. Your time appears straight away.
5. After 5 tries you see your average, and a new best is saved automatically.

The delay is random on purpose. If it were the same every time, you could learn the rhythm and click before you actually see the change, which would measure anticipation instead of reaction.

What happens if I click too early?

If you click while the panel is still red, you see “Too soon!” and that try does not count. Simply start it again. Early clicks are never added to your average, so guessing does not help your score.

What is a good reaction time?

Most people land somewhere between about 200 and 300 milliseconds on a simple visual test like this one. Under 200 ms is quick, and consistently under 170 ms is very fast. Scores above 350 ms usually mean you were distracted, tired, or using a slow screen or input device rather than that your reflexes are poor.

Your result also includes the delay of your own equipment. A screen takes time to show the lime colour, your mouse or keyboard takes time to report the click, and the browser takes time to process it. Depending on your setup this can add anywhere from a few milliseconds to several tens of milliseconds, so compare your scores on the same device rather than against someone else’s gaming setup.

How to improve your reaction time

• Warm up first. Your first few tries are usually slower. Do one or two rounds before the one you care about.
• Rest your finger on the button. Keep your finger resting lightly on the mouse button or the SPACE key so you only need to press, not move.
• Look at the centre of the panel. Focus on one spot rather than letting your eyes wander.
• Use a faster screen if you can. Higher refresh rate monitors show the change sooner.
• Sleep and hydration matter. Tiredness has a real, measurable effect on reaction speed.
• Practice little and often. A few rounds a day works better than one long session.

Fast reactions and fast clicking are related but not the same skill. Once you know your reaction time, try the Aim Trainer to combine speed with accuracy, or test your raw clicking speed with the CPS test.

Why reaction time matters in games

In competitive games, reaction time decides who wins close fights. In Minecraft PvP, the player who notices an attack and responds first often lands the first hit. In shooters, a faster reaction means you start aiming at an enemy a fraction of a second earlier. Reaction time is only one part of skill, alongside game sense, positioning and aim, but it is one of the easiest parts to measure and track.

If you play games that reward fast repeated clicking, pair this test with the 10 second click test or the Kohi click test to see how your reflexes and click speed compare.

Frequently asked questions

Is this reaction time test accurate?

It measures the time between the colour change being drawn and your input arriving in the browser, using the browser’s high-resolution timer. That is accurate for comparing your own results over time. Because monitors, mice and keyboards add their own delay, your absolute number can differ slightly between devices.

Why is my reaction time slower on my phone?

Touchscreens and phone browsers often add extra input delay compared with a wired mouse and a desktop monitor. It is normal for phone scores to be a little slower.

Does a mouse or keyboard give a faster result?

Use whichever you can press with the least movement. For many people a keyboard key under a resting finger is slightly quicker, but the difference is small. Stick with one method so your scores stay comparable.

Why do my times vary so much between tries?

Small differences in attention cause most of the variation. That is exactly why the test averages 5 tries. If one try is far slower than the rest, you probably blinked or looked away.

Is my score saved?

Your best average is saved in your own browser on this device. It is not uploaded anywhere, and clearing your browser data resets it.