Last updated: March 2026
What Is a Reaction Test?
A reaction test measures the time between a stimulus appearing and your physical response. This free online reaction test uses both visual (red-to-green color change) and audio (1000Hz beep) stimuli to measure your reaction speed in milliseconds with sub-millisecond precision.
Complete 5 attempts to get a reliable average, then see how you compare to published human benchmarks. The average visual reaction time is about 250ms and audio is about 170ms. All processing happens in your browser — nothing is uploaded.
How to Take the Reaction Test
Click the test area to start. In visual mode, the screen turns red — wait until it turns green, then click as fast as you can. In audio mode, listen for a beep and click immediately when you hear it. Early clicks reset the attempt without counting against your 5 tries.
After 5 valid attempts, you see your average, best, worst, and consistency (standard deviation). The percentile ranking compares your score to established population data from the Kosinski 2008 meta-analysis.
Frequently Asked Questions
What is a good reaction time?
Under 250ms is average, under 200ms is fast, and under 180ms puts you in professional gamer territory. Most people score between 200-300ms on visual reaction tests.
Why is my reaction time different on phone vs computer?
Mobile touchscreens add 30-70ms of input latency compared to a mouse click. Phone reaction times of 280-350ms are normal and equivalent to 220-280ms on desktop.
Does age affect reaction time?
Yes — reaction time peaks in your early 20s and increases by approximately 4ms per decade. A 60-year-old's average reaction time is about 15-20% slower than a 20-year-old's.
How do I improve my reaction time?
Regular sleep (7-9 hours), caffeine in moderate doses, staying hydrated, and regular practice all improve reaction time. Gaming and sports that require quick reflexes also help. The improvement ceiling is largely genetic.
Is a reaction time under 150ms possible?
For visual stimuli, sub-150ms is physiologically unlikely — nerve signals take at least 120-150ms to travel from eye to brain to hand muscles. Scores under 150ms usually indicate the person anticipated the stimulus rather than reacted to it.