ABOUT

Reaction time, measured in milliseconds.

This test helps you quantify how fast you perceive a change and respond—across multiple modes. Save your results to build a history, then use the analytics to spot trends over time.

HOW IT WORKS

Play, then review.

  • Pick a mode: Visual, Audio, Choice, or Aim.
  • Run multiple attempts to calculate your average.
  • Save results to update your analytics.
WHY IT MATTERS

Improve your consistency.

Reaction time is more than one number. The distribution and history make it easier to see whether you’re getting faster, staying consistent, or both.

RESEARCH & SCIENCE

Human performance, simplified.

Response speed reflects perception, attention, and decision time. This site uses the same practical idea: measure repeatedly under a controlled stimulus.