Ready when you are
Local onlyHuman test
Reaction Time Test
Wait for the color change, react as quickly as you can and compare your attempts in milliseconds.
✓ Instant result✓ No sign-up✓ Runs in your browser
01
How to use this test
- Start the test and get ready.
- Wait while the pad says Hold…
- Click or tap the instant it turns green.
02
If something looks wrong
- Use the same device when comparing attempts.
- A wired mouse can reduce input delay compared with some wireless devices.
- Take several attempts; one result can be affected by anticipation or distraction.
What the result means
The score includes your response and the entire input-to-display path.
After a randomized wait, the test changes the target state and measures the time until the next accepted click or tap. Random timing prevents you from simply following a fixed rhythm. Multiple attempts are more useful than one because anticipation, attention and ordinary timing noise can change any individual result.
The number is not a pure measurement of the nervous system. Display refresh, browser scheduling, mouse or touchscreen processing, wireless latency and system load are included. For a fair personal comparison, use the same device, input method and posture, then compare the median of several attempts.
Reading the signal
Treat the result as a repeatable setup-specific observation.
Consistent attempts
A tight cluster is stronger evidence than one unusually fast result. Consistency suggests that attention and device timing stayed similar.
One very fast score
A result far below the rest may be an anticipation. Use the full set or median rather than promoting a lucky attempt.
Gradual slowdown
Fatigue, distraction or changing hand position can matter. Pause briefly and restart instead of forcing many consecutive rounds.
Device difference
A high-refresh display and a low-latency mouse can reduce the measured chain even when the same person performs the test.
Browser-test limits
This casual browser test is not a medical, neurological or occupational assessment. It does not separate human reaction from display, input-device and operating-system latency.
Read our complete testing methodology →Troubleshooting
From symptom to next step.
What you seeLikely causeWhat to try
Clicks are ignoredThe pointer left the active target, the tab lost focus or a touch gesture was interpreted as scrolling.Keep the tab foregrounded, place the pointer inside the target and use one deliberate click or tap.
Results vary widelyAnticipation, distraction, background load or a wireless connection is adding inconsistent delay.Run five or more attempts in a quiet session, close heavy apps and compare the median rather than the fastest score.
Touch is slower than mouseTouchscreens often add gesture processing and have a different physical movement pattern.Compare each input method separately; do not combine mouse and touch attempts in one baseline.
Quick answers
Good to know.
What is a good reaction time?+
Results vary by person, device and input method. Use your own best and average as the most useful comparison.
Does my screen affect the result?+
Yes. Display refresh rate, browser timing and input latency all contribute to the measured result.
Why can two reaction-time runs differ?+
Attention, anticipation, display timing, browser scheduling and input latency all vary slightly. Compare a group of attempts rather than two isolated numbers.
Why does the test use a random delay?+
A fixed delay can be learned and anticipated. Randomizing the signal makes the result more dependent on noticing the change.
Should I compare my score with other people?+
Only casually. A fair comparison requires similar displays, input devices, browsers and test conditions, which online participants rarely share.