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.
Free to embed on blogs, gaming and teaching sites. Copy the code below — it stays up to date automatically.
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.