Reaction Test

Reaction Test measures your visual reaction time with a simple but scientifically grounded test: a screen that changes from red to green at a random interval, and you must click as quickly as possible when the color changes. Each trial consists of a random delay (1.5 to 4.5 seconds) followed by the green signal. The session consists of 5 trials, and your reaction time for each is recorded in milliseconds. The average of all 5 trials is your overall score. The random delay prevents anticipation bias — if the delay were constant, you would learn to predict it and your reaction time would artificially improve. The 1.5-4.5 second range is standard in cognitive psychology research for simple reaction time tests.

The average human visual reaction time is approximately 250 milliseconds. Professional gamers often score between 150-200ms. Scores below 150ms are rare and typically indicate anticipation rather than true reaction. We display your running average throughout the test so you can see your performance improve with each session — practice effects in reaction time tasks are well-documented and typically result in 10-20ms improvement over the first 5-10 sessions. Your best average is saved to localStorage for comparison across sessions. The test uses DOM-based color manipulation rather than Canvas for maximum rendering speed — every millisecond counts when measuring reaction time. The background color changes from a neutral gray to green, which triggers a stronger visual response than color changes between non-complementary colors.

Controls

Designed for both desktop and mobile play. Touch-friendly interface.