Tap the moment the screen lights up — that's all. This free checker measures your reaction speed in milliseconds and tells you your 'reflex age', judged on the average of several tries so a lucky tap won't skew it.
Your personal best is saved on your device, so you can watch your training pay off. Challenging family and friends to an age battle is half the fun.
The result is a playful estimate, not a medical assessment of your age or ability. You can try as many times as you like without signing up, and share your result as an image. Your records stay on your own device.