Reaction Time Test
Wait for the panel to turn green, then tap as fast as you can. Five rounds, one average: how quick are your reflexes?
This test is visual: the panel turns from red to green at a random moment, and you tap as soon as you see it. Screen readers can't announce the change quickly enough for a fair result.
Or press Space · Your score is the average of five rounds
How the reaction time test works
- 1Tap the panel, click it or press Space. It turns red: keep still and watch.
- 2After a random 1.5 to 5 seconds it turns green. Tap, click or press Space the instant you see it.
- 3Five counted rounds make a test. Your score is the average, with your best and slowest rounds beside it.
Each reaction is timed from the frame that first draws the green panel to the timestamp your browser gives the tap or key press, using its high-resolution clock, so a busy page can't add to your time. A tap before green is too soon, and one under 100 ms can only be a guess, so neither counts: that round simply starts again. So does a round slower than 2 seconds.
The test is visual. It measures how quickly you respond to something you see, so it can't be played fairly with a screen reader. The panel always says what to do in words, so you never need to tell red from green.
What is the average reaction time?
On browser tests like this one, most people's averages land somewhere around 200 to 300 milliseconds. That is more than thinking time: it covers your eyes registering the change, the signal reaching your hand and the press itself, plus whatever delay your screen and your mouse, keyboard or touchscreen add.
Your own number moves from day to day with sleep, focus, practice and time of day, and reactions tend to slow a little with age. The fairest comparison is with yourself, on the same device.
| Your average | Label |
|---|---|
| Under 180 ms | Lightning |
| 180–219 ms | Very fast |
| 220–259 ms | Fast |
| 260–299 ms | Steady |
| 300–359 ms | Relaxed |
| 360 ms and over | Sleepy |
Why your device changes your reaction speed
Every result includes the time your hardware takes to show green and to report your press. That delay is different on every setup:
- Screen refresh
- A 60 Hz display shows a new frame about every 17 ms, so green can wait up to a frame before it appears. 120 Hz and 144 Hz screens cut that wait, and a TV or monitor in game mode skips extra image processing.
- Touchscreens
- Phones and tablets detect and filter each touch before the browser hears about it. That usually adds more delay than a wired mouse or keyboard, and the amount varies from model to model.
- Wireless mice and keyboards
- Bluetooth often adds a few milliseconds, sometimes more when a device wakes from power saving. A cable, or a gaming receiver, is usually quicker.
- Battery saver and busy devices
- Power-saving modes can lower the refresh rate, and a heavily loaded computer can be slower to draw the green frame.
So a gap of 20 or 30 ms between your phone and your laptop may be the hardware, not you.
How to improve your reaction time
- Warm up with a practice test or two before the one that counts.
- Give it your full attention: eyes on the panel, notifications off.
- Rest your finger on the key, button or screen so nothing has to travel.
- React, don't predict. The wait is random, and a guess restarts the round.
- Use a wired mouse or keyboard and a high refresh rate screen if you have them, with battery saver off.
- Be rested. Tired reactions are slower, and no trick makes up for sleep.
Frequently asked questions
What is a good reaction time?
On a test like this, an average under about 250 ms is quick and under 200 ms is very fast. Most people land somewhere around 200 to 300 ms. Your device adds its own delay, so compare results on the same screen and input.
What is the average human reaction time?
For a simple visual test like this one, where you press as soon as a colour changes, most people average somewhere around 200 to 300 milliseconds in a browser, device delay included. It varies with focus, tiredness, age and practice, so treat any single result as a rough guide.
Why is my reaction time slower on my phone?
Touchscreens and many Bluetooth accessories add delay before your tap reaches the browser, and many phone screens still refresh at 60 Hz, or drop to it in battery saver. A wired mouse or keyboard on a fast screen usually gives a lower number for the same reflexes.
Why didn't my tap count?
A tap before the panel turns green is too soon, and a reaction under 100 ms is quicker than anyone can respond to what they see, so it was a guess. A round slower than 2 seconds is skipped too. Each time, only that round starts again.
How do I challenge a friend?
Finish a test, add your name if you like, and share the link. It opens this test with your average on screen and tells your friend whether they beat you.
Is this a medical or driving test?
No. It's a reflex game for comparing yourself with friends and with your own past results. It can't diagnose anything and is no substitute for a professional assessment.
Like a challenge? Try the 10 Second Challenge and stop the clock at exactly 10.00 without looking. Need to time something for real? Use the online stopwatch.