Test your reflexes online with a quick five-round challenge. See how fast you respond, then try to beat your personal best.
Click, tap, or press Space when the panel turns green.
True reflexes are involuntary. This test measures voluntary reaction — perceiving the green signal and responding. It's still a great way to benchmark and train your responsiveness.
Short daily sessions and tracking your median are the best way to see real improvement.
It measures voluntary reaction time, which is what online 'reflex tests' actually assess.
Under 250 ms is strong on this format; under 200 ms is very fast.
Practice regularly, stay focused, warm up, and reduce input latency.
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.