Reaction Time Test
Measure how quickly you respond after a visual signal changes. Practice five randomized trials and compare your median, not an invented worldwide percentile.
Play Reaction Time Test
Press Start, wait for the signal to turn green, then tap or click as fast as possible. Early taps are recorded as false starts.
How to play Reaction Time Test
Press Start, wait for the signal to turn green, then tap or click as fast as possible. Early taps are recorded as false starts.
How results are calculated
Median response time across valid trials, measured in milliseconds using the browser clock.
Accuracy, limitations and fair comparisons
Display refresh, device input, and browser scheduling affect the score. The challenge runs in your current browser session; compare repeated attempts on the same device for a more useful personal reference.
Questions and answers
Is Reaction Time Test free?
Yes. This activity is free and does not require registration.
Does this test upload my input or score?
No. Gameplay and optional history storage run in your browser on this device; exporting a result requires your own action.
What is the measured result?
Median response time across valid trials, measured in milliseconds using the browser clock.
Can the result be treated as a medical or hardware diagnosis?
No. Display refresh, device input, and browser scheduling affect the score.
Related free challenges
Respond to one of four colored signals by choosing the matching labeled button, combining reaction speed and decision accu
Play free →Go / No-Go Reflex ChallengePractice attention and impulse control by tapping only green GO signals and ignoring red STOP signals.
Play free →Audio Reaction Time TestMeasure your response to a short sound signal using your device speakers or headphones, with several repeated trials.
Play free →