Human Reflex Test

This free online human reflex test helps you measure how fast you really react to visual changes on the screen. As soon as the color changes or the target appears, click or tap to see your reaction time in milliseconds. Each attempt is recorded so you can track your reaction speed over time and see whether your focus and reflexes are getting better.

Use this reaction time test as a quick benchmark throughout the day: try once when you are fresh, once when you are tired, and once after a short break. Comparing your scores can reveal how sleep, stress, caffeine and screen time affect your human reflexes and concentration. Because everything runs in your browser, you can repeat the test anytime without installing an app.

Key Features:

• Accurate online reaction time measurement in milliseconds
• Automatic tracking of best score, average reaction time and total attempts
• Clear visual feedback with color-coded performance ratings
• Three difficulty modes (Easy, Medium, Hard) to test different levels of reflex control
• Built-in performance tips and reflex improvement suggestions
• Reaction time reference chart to compare your results with typical ranges
• Mobile-friendly, touch-ready interface that works on phones, tablets and desktop
• No sign-up required – a simple, fast and free reaction time test

How the reaction time test works

• Choose a difficulty level that matches how challenging you want the reflex test to be.
• Click "Start Test" and wait without clicking until the screen changes color or the orb appears.
• React as quickly as possible – your response time in milliseconds is calculated instantly.
• Repeat a few times to get a more accurate picture of your average reaction speed.

Perfect for: gamers who want faster in-game reactions, athletes working on start speed, drivers who care about road safety, students training focus and hand–eye coordination, researchers running simple reaction time experiments, and anyone curious about how quick their human reflexes really are.