A 3-minute reaction-time test that compares each result with what’s usual for you.
When a number appears in the middle of the screen, tap anywhere as fast as you can. Don't tap before it appears.
Safety notice: This result is for personal reference only. It is not a medical assessment and does not determine whether you are fit to drive or work. If you feel sleepy or unwell, do not rely on this result—stop and follow the safety procedures that apply to you.
Your screen may dim on its own. Please keep it on during the test.
Safety notice: This result is for personal reference only. It is not a medical assessment and does not determine whether you are fit to drive or work. If you feel sleepy or unwell, do not rely on this result—stop and follow the safety procedures that apply to you.
Your results stay on this phone only. Clearing browser data, uninstalling, or switching phones will erase them, and a new phone needs a new usual.