What Keel is
A daily cognitive check-in. Processing speed, reaction time, working memory, arithmetic, verbal fluency. Five tests, four minutes, one composite score. Repeat it and the trend becomes the point.
"I used to be sharper."
That thought deserves better than a shrug.
Cognitive change is slow enough to miss and fast enough to matter. By the time most people notice, they've lost months of baseline. Keel exists so you don't have to rely on a feeling. Four minutes a day, five short tests, a trend line that gives you something concrete to show a doctor if you ever need to.
What Keel is not
Not a diagnosis. Not a substitute for a neurologist. Think bathroom scale, not MRI. Useful personal data that belongs to you.
Why these tests
We picked tests that detect change when repeated daily. Plenty of cognitive games are fun but noisy. These are boring in the best way: reliable, sensitive, and quick enough that you'll do them tomorrow too.
Bad days happen
You log sleep and illness before each session. A bad score after four hours of sleep means something different than a bad score after a full night. Your trend knows which is which.
What the four minutes look like
Symbol matching pairs symbols to digits as fast as you can. Reaction time measures raw speed. Arithmetic adapts difficulty to your level. Spatial memory tests where things appeared on a grid. Word fluency asks how many words you can name in a category. These are the cognitive domains where subtle shifts surface first.