Reaction Time Test

Test your reflexes and track your cognitive performance over time

Click to start. The panel will turn red, then green after a random delay. Click as fast as you can when it turns green. Take 5 measurements for best accuracy.

Progress: 0/5 measurements

Click to Start

💡 Click the blue panel to start. It will turn green after a random delay.

What is Reaction Time?

Reaction time is the interval between a stimulus and your response to it. It's a key indicator of cognitive function, alertness, and nervous system health.

This test measures your simple reaction time - how quickly you respond to a single, predictable stimulus (the color change from red to green).

Why Track Reaction Time?

Monitor cognitive performance and mental sharpness
Track the effects of sleep quality on alertness
Measure impact of nutrition, caffeine, or supplements
Detect early signs of fatigue or burnout
Assess training effectiveness for athletes and gamers
Discover correlations with other health metrics

Factors That Affect Reaction Time

Sleep Quality: Poor sleep or sleep deprivation can significantly slow reaction times. Well-rested individuals typically react 50-100ms faster.

Age: Reaction time peaks in your early 20s and gradually slows with age, though regular training can help maintain quick reflexes.

Practice: Regular testing and training can improve reaction times by 10-20% over several weeks.

Stimulants: Caffeine and other stimulants can temporarily improve reaction time by 5-10%.

Stress & Fatigue: High stress or physical fatigue can impair reaction time significantly.

💡 Tips for Accurate Testing

•Use the same hand and finger each time for consistency
•Sit in a comfortable position with your finger hovering over the mouse/trackpad
•Minimize distractions - close other tabs, silence notifications
•Test at the same time of day to track meaningful changes
•Take 5 measurements and use the average for best accuracy
•Don't try to anticipate - wait for the green before clicking