The visual reaction test measures how quickly you respond to a visual signal — the screen turning green. It's the classic, most common reaction test format.
Click, tap, or press Space when the panel turns green.
Your simple visual reaction time: the delay between seeing the color change and completing your response. Screen refresh rate and input device both add a small, roughly constant offset.
Auditory reactions are often marginally faster than visual ones. Try the audio reaction test to compare your own visual and auditory speed.
200–300 ms is typical online; under 200 ms is very fast.
Touchscreens add more input latency than a wired mouse, so mobile results often look a little slower.
We start a high-resolution timer the instant the green frame renders and stop it when your input registers.
ReactionLab is a browser-based reaction performance test. It is not a medical, neurological, or intelligence assessment. Results depend on your hardware, input device, and browser. See our methodology.