Reaction Time Test

This reaction time test measures how quickly you respond to a clear visual signal. When you start the test, the panel turns into a waiting state and the tool chooses a random delay. The delay changes on every attempt so you cannot predict the exact moment. When the panel turns green, click, tap, or press the Space key as fast as you can. The timer starts at the color change and stops at your first valid response, then shows the result in milliseconds.

The test uses five attempts because one result is not enough to judge reaction speed. A single round can be affected by a lucky guess, a blink, a slow tap, or a small delay from your device. After five valid reactions, the tool calculates your average time, best time, and latest time. If you click before the green signal, the attempt is marked as too soon and does not count toward the final average.

Everything runs in your browser. No score is uploaded or saved on our server. For the most useful comparison, keep the same device, browser, input method, and screen refresh rate. Use the result as a practical benchmark for gaming warm-ups, focus checks, or simple practice, not as a medical or professional diagnosis.