Reaction Time Test
Run five target-reaction rounds where a shrinking target appears at a random position and must be clicked before it disappears.
How to use this test
Start the five-round session and wait for a small target to appear at a random position. Click the target before it shrinks away. Clicking the field before a target appears is marked Too Soon; clicking outside a live target counts as a miss.
How the measurement works
Each round uses a random wait to reduce anticipation. When the target appears, performance.now() records the signal timestamp. The target remains live for a short fixed window while the visual shrinks toward zero.
How to interpret results
Use the average of successful hits as your reaction result, then check fastest time and misses for consistency. This target-reaction mode includes both visual detection and a small pointer movement, so it is intentionally more game-like than a full-screen color-change test.
Troubleshooting tips
Keep the tab visible, avoid pre-clicking, use the same mouse or touch input for comparisons, and make sure browser zoom stays unchanged. Display refresh and input latency can affect the measured number.
Related tests
You can also browse every utility from the complete tool index.
Common reaction questions
What is an average human reaction time?
Simple visual reaction times are commonly measured in a few hundred milliseconds, but browser, display and input latency are included in an online result. Compare repeated runs on the same setup instead of treating one number as a biological measurement.
Read full answer →Why does my reaction time vary so much?
Sleep, attention, anticipation, display timing, mouse latency and random target delay all affect a run. Use several attempts and focus on your average or median rather than one exceptionally fast click.
Read full answer →Can monitor refresh rate affect reaction-time results?
Yes. The visual target can only be presented on a rendered frame, so a higher or more stable refresh rate can reduce part of the display-side delay included in a browser test.
Read full answer →What happens if I click before the target appears?
The round shows Too Soon and restarts without adding a result. Earlier completed rounds are preserved.
Read full answer →