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Reaction Test

Test your reflexes - Best of 5

Click to Start
Click when the screen turns green

How it works

1. Click the box to start a round

2. Wait for the red screen to turn green

3. Click as fast as you can!

4. If you click too early, it counts as a penalty

5. Complete 5 rounds to see your average

About the Reaction Test

The simple visual reaction test is one of the oldest experimental measures in psychology, dating back to Franciscus Donders' work on mental chronometry in the 1860s. A healthy adult typically reacts to a visible stimulus in 200 to 300 milliseconds — a number that shows up everywhere from driving safety research to eSports benchmarking.

This browser test measures how fast you can click when the screen turns from red to green. You take five attempts, your average is calculated, and a rank badge shows where your time lands compared to most players. Clicking too early counts as a fault, so the test also measures restraint, not just raw speed.

How to Play

Controls: Click the large box to start a round. When the red background turns green, click as quickly as you can. Repeat five times for a final average.

Objective: Achieve the lowest possible average reaction time across five attempts. Premature clicks are counted as penalties, so waiting for the green flash is essential.

Tips & Strategy

  • Keep your finger slightly above the mouse button rather than resting on it. Travel distance adds milliseconds.
  • Look at the center of the box, not at your cursor. Your peripheral vision picks up color changes fast enough.
  • Breathe out before the expected flash. Tension and held breath both slow down reactions.
  • Resist the urge to anticipate. Guessing when green will appear usually leads to early-click penalties.
  • Take short breaks between sessions. Fatigue is the biggest killer of reaction speed.