Reflex test
How fast do you react?
Tap the panel, wait for it to turn cyan, then tap again as quickly as you can. Five tries, one average.
Times include a little delay from your screen and input device, so they run slightly slower than your true reaction time. Compare runs on the same device.
What the number means
The test measures simple visual reaction time: the gap between a change on screen and your tap. For a healthy adult paying attention, results in the low-to-mid 200s of milliseconds are common, a quarter of a second or less. The average of five tries is a better guide than any single tap, which can be lucky or late.
Reading your result
| Average | Roughly |
|---|---|
| Under 200 ms | Very quick |
| 200 to 250 ms | Quick; a common range for alert adults |
| 250 to 300 ms | Typical |
| 300 to 400 ms | On the slow side: tired, distracted or a laggy device |
| Over 400 ms | Try again when you are more awake |
These bands are a rough guide for this kind of on-screen test, not a medical measure.
What changes it
- Sleep and time of day. Being short on sleep slows reactions noticeably. So does the mid-afternoon dip.
- Attention. A glance away just before the change costs far more than any physical limit.
- Your device. Displays, wireless mice and touchscreens each add some delay. A phone and a desktop will give the same person different numbers.
- Practice. You get better at this particular test quickly, mostly by learning to stay ready.
Why tapping early does not help
The wait is a random length each time, so you cannot learn the rhythm. Tap before the change and the try is thrown out. That is the difference between reacting and guessing, and it is also what makes one-tap games hard: the timing is never quite where you expect it.
Reflexes checked. Now flip gravity.
Fluxo: Gravity Runner is a one-tap iPhone game. Your runner speeds through a tunnel; one tap flips gravity to dodge what is coming. It is all timing.
Get Fluxo on the App StoreFree download with in-app purchases. Check the App Store for current details.
Honest Little Apps publishes both Fluxo and this page. This is a separate browser tool and does not sync with the app. App details checked November 10, 2026.
On a computer? Open it on your iPhone
