Reaction speed
Wait for six randomly timed dots and tap as soon as each one appears.
Personal state · not a diagnosis
Feeling Foggy Today?
Spend about two minutes on three touch-friendly challenges and see how today compares with a clearer day for you.
3 guided trials · about 30 seconds · not scored
Feeling foggy today?
Try three quick reaction, focus, and memory challenges to see how today compares with a clearer day for you.
First, learn what a clear day looks like for you
Your first visit has just three guided trials—one for each game—and they are not scored.
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No account or upload. Results stay in this browser.
What happens in two minutes?
Ignoring distractions
Follow only the center arrow while the arrows around it try to pull you the wrong way.
Reverse memory
Remember four short cell sequences, then tap each one back in reverse.
Why save a few clearer days first?
Everyone starts with a different reaction speed and memory level, and the device, surroundings, and practice can all change a score. This tool never ranks you against other people. Your first visit begins with three guided, unscored trials—one per game. Then save three full runs on days when you feel clear; later checks compare only with those personal records. Seven runs are optional, but give the tool a better picture of your natural variation.
How should I read the result?
- Start with the overall message, then see which of reaction, distraction, or reverse memory changed.
- A stronger state message appears only when at least two areas move beyond the comparison guide.
- One result can change because of sleep, stress, surroundings, a browser pause, or an accidental tap.
- If the same area shifts repeatedly across three recent checks, the page points it out—but it is still not a diagnosis.
Will my test data be uploaded?
No. There is no sign-in, and test records stay in this browser rather than being uploaded to a server. Clearing browser data or using the delete button removes them.
A playful check, not a diagnosis
This short game is inspired by cognitive tasks, but it cannot diagnose brain fog, measure intelligence, or rule out a health problem. Seek professional help for cognitive changes that are sudden, persistent, or disruptive.
Brain Fog Check FAQ
Is this brain fog test accurate?
It is not a clinically validated brain fog test and cannot diagnose a condition. It is a short game for noticing whether your reaction, distraction control, and reverse memory look different across days.
How long does one check take?
An official check has 15 rounds and usually takes about two minutes. On your first visit, three guided practice trials take about 30 seconds and are not scored.
Why can’t the practice tell me whether I am foggy?
The three guided trials only confirm that the controls make sense. People naturally differ, so without your own clear-day history the game cannot sensibly say whether today is unusual for you.
Why save three clear-day runs? Must I reach seven?
Three runs are enough to begin a rough personal comparison and can be completed on different days. Seven are optional; they simply give the tool more information about your usual variation.
What does a shift from my reference mean?
Only that this very short run differed from your saved clear-day records. Sleep, stress, mood, surroundings, device delay, and simple mistakes can all affect it; it does not show that your intelligence or ability declined.
Can I switch phones or computers?
For a fairer comparison, keep using the same device because touchscreens, browsers, and hardware delay differ. Records stay in the original browser and do not transfer automatically.