⚡ Reaction Time Test
Test your reflexes with high-precision timing. Click when the screen turns green — free, no signup.
📋 When to Use the Reaction Time Test
The Reaction Time Test is useful for gamers warming up before competitive play, athletes tracking cognitive performance, drivers checking alertness, or anyone curious about their reflexes. Use it as a quick daily benchmark — test yourself in the morning and evening to see how fatigue, caffeine, or sleep affects your speed. It's also great for competitive fun with friends to see who has the fastest reaction. Because everything runs in your browser, your scores are stored locally and never sent to a server.
⚙️ How Reaction Time Test Works
The Reaction Time Test measures the delay between a visual stimulus appearing and your click/tap response. It runs in your browser using JavaScript — a random delay (1-5 seconds) prevents anticipation, then the screen changes color and the timer starts. Your reaction time in milliseconds is recorded when you click. Multiple trials give you an average score. No data leaves your device.
How to Use the Reaction Time Test
1. Click the blue area to start. The test area turns red with the message "Wait for green..." A random delay of 1–4 seconds follows — this prevents anticipation.
2. Click as fast as you can when it turns green. The moment the area turns green and displays "CLICK NOW!", click or tap immediately. Your reaction time is measured from the exact frame the color changed.
3. Review your stats. See your last result, personal best, 5-trial average, and total attempts. Color coding helps you gauge performance: green (<200ms excellent), yellow (200–300ms good), red (>300ms slow).
4. Keep practicing. Repeat as many times as you want. Click "Reset Stats" to clear your history and start fresh. You can also press the Spacebar or J key instead of clicking.
Frequently Asked Questions
How accurate is the reaction time measurement?
Very accurate. We use performance.now() which provides sub-millisecond precision. The timer starts the moment the screen turns green — not when the color change animation begins.
What is a good reaction time?
The average human visual reaction time is about 200–250ms. Below 200ms is excellent (pro gamer territory). Below 150ms may indicate anticipation rather than true reaction. Times under 50ms are flagged as "too fast" and rejected.
Why did I get "Too early!" or "Too fast!"?
"Too early!" means you clicked during the red waiting phase before it turned green. "Too fast!" means you reacted in under 50ms, which is physiologically improbable — usually this means you anticipated the change or double-clicked.
Can I use this on mobile?
Yes. The test is fully touch-optimized. Tap to start and tap when green. Touch events use preventDefault() to eliminate the 300ms tap delay on mobile browsers, keeping measurements accurate.