Reaction Speed
Reaction speed tests measure the time between a stimulus appearing and your response — in milliseconds. The classic test is simple: wait for the signal, respond as fast as you can, and repeat enough rounds to separate your true reaction time from luck. False starts are detected and don't count.
Tests in Reaction Speed
Reaction Time Test
Free reaction time test. Five rounds of wait-for-green, with average and best reaction in milliseconds, round spread, and false-start detection.
Click Speed Test
Free CPS test. Click as fast as you can for 5 or 10 seconds and measure your clicks per second, with personal bests saved locally.
Aim Trainer
Free aim trainer. Hit 20 targets as fast as you can — average time per target, accuracy, and misses, with personal bests saved locally.
Why It Matters
Reaction time underpins driving, sports, gaming, and any task where the world changes faster than you can deliberate. The average simple visual reaction time is around 250 milliseconds; trained gamers and athletes trim tens of milliseconds off that. Measuring it regularly also reveals how sleep, caffeine, and fatigue affect your responsiveness — your spread between rounds is often more telling than your best.
Related Guides
How to Improve Your Reaction Time
What reaction time is, what's normal in milliseconds, and the training, sleep, and lifestyle factors that genuinely make you respond faster.
Average Reaction Time: What's Normal and What's Good
Typical human reaction times in milliseconds, how they change with age, what counts as fast, and why your test medium matters.
Average Click Speed: What's a Good CPS?
Average clicks per second on 5- and 10-second tests, what counts as fast, and how jitter, butterfly, and drag clicking change the numbers.