Game logic
After Start, the page waits for a random delay, changes to GO and timestamps your click with the browser’s high-resolution timer.
⚡ REACTION TEST
How fast are your reflexes?
Wait for GO. Then click like your dignity depends on it.
REACTION TEST
Click to start
Wait for GO. Don't click early.
Best on this device—
Reaction
Attempts
Play another
HOW THE GAME SCORES
Reaction Test
Measure the delay between the visual GO signal and your click. False starts are kept separate so an early click cannot become a fake fast result.
Reading your score
Lower milliseconds are faster. Compare repeated attempts on the same device rather than treating one number as a universal human benchmark.
Worked example
A result of 240 ms means the browser received your click about 0.24 seconds after presenting the GO state.
Good to know
Display refresh rate, browser scheduling, touchscreen or mouse latency and device performance all add some measurement noise. This is a web mini-game, not laboratory equipment.
UNDERSTAND YOUR RESULT
What your reaction-time score actually means
A browser reaction test is useful when you treat it as a repeatable personal measurement, not a medical verdict. The interesting part is not one heroic click — it is the pattern across several attempts on the same setup.
The measurement chain
Your score includes more than your nervous system. The display must present the GO state, the browser must paint it, your eyes detect the change, your brain selects a response, your hand moves, and the input device reports the click back to the browser.
Why one attempt is noisy
A lucky anticipation can produce an unusually fast score while distraction can produce a slow one. Five to ten clean attempts tell you much more than a single number. False starts should be excluded rather than rewarded.
Phone versus desktop
Touchscreens, mice, display refresh rates and browser scheduling differ. That means a score from a phone should not be compared too confidently with a score from a gaming monitor and mouse.
A better way to improve
Use the same device, posture and input method. Do a short warm-up, run a small set of attempts, rest briefly, then compare the median or typical cluster rather than obsessing over the fastest click.
| Signal | What it is useful for | Important limitation |
|---|---|---|
| Fastest attempt | Fun for bragging rights | Very sensitive to luck and anticipation |
| Median of 5–10 | Better personal baseline | Resists one unusually fast or slow result |
| Same-device trend | Best for self-comparison | Shows whether your typical performance changes |
| Cross-device comparison | Use cautiously | Hardware latency can change the apparent result |
Do not diagnose yourself from a web game
Reaction time varies with sleep, attention, fatigue, practice, caffeine, age, device latency and many other factors. EgoTools is a mini-game and self-comparison tool, not a clinical assessment.
Go deeper
What is a good reaction time?How to interpret a score without pretending one cutoff applies to everyone.Why phone and PC scores differThe hidden hardware and browser delays inside a reaction test.How browser timing tests workWhat performance.now(), event handling and screen refresh actually measure.Further reading / technical references