Play Reaction Tester Online

About Reaction Tester

Reaction Tester measures your reflexes with a simple but addictive challenge. Wait for a shape to appear, then click it as fast as you can. Your reaction time is measured in milliseconds, and building a streak of fast clicks earns bonus points. Find out how your reflexes stack up and try to improve your personal best.

How to Play

1. Wait for the screen to change color or a shape to appear
2. Click as fast as possible when you see the signal
3. Your reaction time is measured in milliseconds
4. Don't click too early — false starts may penalize you
5. Build a streak of fast reactions for bonus points
6. Try to consistently get below 300ms for a great score

Controls

• Mouse Click: React to the signal
• Space: Alternative reaction input