Reaction Speed Test

Test your reaction speed by clicking when the screen turns green

Click as fast as you can when the screen changes from red to green

Average human reaction time: 200-300ms

How to Use

Accurately measure your human reaction time to a visual stimulus. This reflex test calculates the exact milliseconds it takes for your brain to process the screen turning green and command your hand to click. (100% browser-local processing, no server storage)

Click 'Start Test' and keep your eyes focused on the red screen.

The moment the color shifts to green, click your mouse or tap the screen instantly.

Review your latency score in milliseconds. The system logs your attempts to find your true average.

Pro Tips

Do not anticipate the green screen. The delay is randomized to test true cognitive speed, not predictive timing.
For a scientifically reliable baseline, complete at least 5 consecutive trials to account for outliers.
After testing your visual reflexes, challenge your physical input speed with our [Typing Speed Test](/typing-speed-test).

Use Cases

Practical applications for tracking your cognitive and physical response speed:

Esports & Competitive Gaming

Benchmark physical reflexes required for fast-paced titles like FPS or MOBA games.

Example: A professional Valorant player uses the tool as a morning warm-up routine to assess their daily central nervous system readiness before queuing for ranked matches.

Fatigue & Focus Monitoring

Quantify mental exhaustion through measurable reaction delay.

Example: A long-haul driver or shift worker takes the test before and after their shift to objectively measure cognitive degradation and determine if they need rest.

Sports Science & Physical Therapy

Track recovery or physical baseline metrics over time.

Example: Athletes recovering from concussions or physical trauma use regular reflex testing to ensure their neural pathways are firing at standard speeds during rehabilitation.

Frequently Asked Questions

What is considered a good or average human reaction time?

The globally accepted average for human visual reaction time sits between 200ms and 300ms. Scoring under 200ms indicates sharp reflexes, while numbers near 150ms approach professional athlete levels.

Why does the test occasionally say 'Too early'?

This happens if you input a click before the visual cue (green screen) appears. The tool uses randomized interval generation specifically to prevent predictive clicking and ensure accurate latency tracking.

Can hardware latency affect my final millisecond score?

Yes. Characteristics like mechanical keyboard polling rates, wireless mouse lag, monitor refresh rates (Hz), and browser rendering can introduce a cumulative hardware delay of 10-30ms.

Why Use This Tool?

Gain immediate, empirical data regarding your neurological readiness. This scientifically grounded reflex tool requires zero installation and provides unfiltered, ad-free latency testing directly within any modern web browser.