Reaction Time Test
Measure visual response time over five attempts with a randomized wait.
Five attempts per session
Click, tap, or press Space to start
Wait for green, then respond as fast as you can.
How to Test
- •Press Start, wait for the panel to turn green, then click, tap, or press any key immediately.
- •Clicking too early invalidates that attempt — wait for the green signal.
- •Complete five valid attempts; the tool shows each time, your best, and the median.
Browser Limitations
- •Screen refresh latency, input-device latency, and browser scheduling all affect results.
- •This is a browser-timing measurement — not a medical or cognitive assessment.
Troubleshooting Tips
- •Extremely inconsistent values usually mean background throttling or a busy CPU.
- •Use a wired mouse and a fullscreen window for the most repeatable conditions.
About the Reaction Time Test
The Reaction Time Test shows a waiting panel that turns green after a randomized delay; your job is to respond the instant it does. Five attempts per session are measured in milliseconds from the visual change to your input, and the tool reports every time alongside your best and your median.
The randomized wait exists to stop you from anticipating — the test measures your reaction to the signal, not your rhythm. Clicking too early invalidates that attempt, so a clean session of five valid runs is the honest baseline.
Tips for a reliable result
- Use the same input method for all five attempts — mouse click, tap, or key press — so the runs are comparable.
- Sit comfortably and focus on the panel; distraction inflates every number more than hardware differences do.
- Aim for consistency across attempts: your median describes your steady state better than a single lucky best.
- Compare only sessions taken under the same conditions — screen, device, and time of day all shift the numbers.
- Warm up with one throwaway session if the first numbers look stiff; response times settle after a few minutes.
Common problems and fixes
I keep clicking too early
That is anticipation: you are timing a rhythm instead of reacting to the signal. The randomized delay exists to break that habit — wait for the color change itself, not for a feeling that it is due.
My times are wildly inconsistent
Background CPU load and browser throttling inject noise. Close other tabs and apps, keep this tab in the foreground, and run the five attempts back to back without pausing.
My results are slower than my friend’s on the same page
The number includes display latency, input-device latency, and browser scheduling on top of human reaction — a 60 Hz screen and a 240 Hz screen do not produce comparable times. Compare sessions on identical setups only.
Keyboard attempts do not register
Click the page once so it has keyboard focus before starting, and avoid OS shortcuts that use the spacebar (like page-scroll) while the test is active.
FAQ
What is a good reaction time?
Visual simple-reaction times around 200–250 ms are typical for adults, but any specific number depends on your display, input device, and browser latency. Use your median across five attempts and compare it only with sessions on the same setup.
Is this a medical or cognitive assessment?
No. It is a browser-timing measurement of a simple visual response — useful as a rough self-check or for fun. It diagnoses nothing and says nothing about health, fitness for work, or driving ability.
Why does the panel change color at random intervals?
A predictable interval would let you anticipate the signal instead of reacting to it. The randomized delay keeps every attempt an honest measure of response rather than rhythm.
Can I use a keyboard or touchscreen?
Yes — click, tap, or press any key once the panel turns green. Stick to one method per session so the five attempts are comparable.
Where do my times go?
Nowhere automatically. The five times, your best, and your median are computed in your browser and saved only to your device’s local test history.