Reaction Time Test
When the red box turns green, click as fast as you can.
Click to Start
Result
Clicking Try Again adds this to your history.
Recent Results
Reaction Time Test — How Fast Are You?
Reaction time is the delay between seeing a signal and responding to it — and it is trainable. This free test flashes a box from red to green at random intervals; click as fast as you can and your time is measured in milliseconds, with a skill rank for context.
Your best time, average and attempt count are tracked across tries, and a history log records every result. Click too early and it counts as a false start — patience is part of the game. Everything runs in your browser with no signup.
Millisecond precision
Times are measured with the browser's high-resolution timer, so the difference between 210ms and 240ms is real — and rankable.
Best, average and history
Each attempt is logged with its rank, and your best and average are tracked across sessions, so you can watch yourself improve over time.
How to play
Click the box to start, wait for red to turn green, then click as fast as you can. The box turns green after a random delay, so you cannot predict it — clicking early is a false start and the round restarts.
How to use
- Click the game box to start a round.
- Wait for the box to turn from red to green.
- Click as fast as you can the instant it turns green.
- Check your time, rank and updated stats — then try again.
Frequently Asked Questions
What is a good reaction time?
Most people score between 200 and 300 milliseconds. Under 200ms is excellent; over 350ms suggests you were distracted or anticipating instead of reacting.
Why did I get a false start?
Clicking before the box turns green counts as a false start. The green appears after a random delay specifically so you cannot time it — react, do not predict.
Does this test work on mobile?
Yes. Tap the box instead of clicking. Touch screens add a small input delay, so mobile scores run slightly slower than desktop mouse clicks.
Can I improve my reaction time?
Yes. Sleep, focus and practice all help. Repeated attempts train you to stop anticipating and start reacting, which is where most beginners lose time.
Is my score stored anywhere?
Scores are kept in your browser's local storage on your device only — nothing is uploaded or shared.
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