Cognitive fitness for modern life
Keen builds a personalized 10-minute mix of game-like puzzles, demanding reading, reasoning, recall, and writing—then shows how your performance changes over time.
Wednesday
Good morningToday’s focus
Focus
74Reason
82Recall
68One workout · many kinds of thinking
A workout can move from visual pattern recognition to a difficult passage to a constrained writing task. The format changes. The skill model stays connected.
A harder, domain-specific rep
This is closer to an SAT or LSAT passage than a generic “brain game”—and it becomes more nuanced as your accuracy improves.
An online marketplace piloted a ranking model that promoted unfamiliar sellers. Buyers exposed to the model purchased from a wider range of sellers and returned more often 30 days later. The company concluded that seller diversity increased retention.
However, the pilot was offered only to buyers who had previously browsed at least five seller pages. The treatment also shortened the delivery estimates shown on product cards.
Which additional finding would most seriously weaken the company’s causal interpretation?
That result removes both plausible confounders and eliminates the observed lift, directly weakening the claim that seller diversity caused retention.
Some reps feel like games. Others feel like work.
The arrow rotates clockwise. The dot count increases by one. Choose the next tile.
Although the beta performed better on engagement, we should probably avoid launching it globally right now because the experiment was short, the sample excluded new users, and support contacts increased.
Hold the global launch. The beta raised engagement, but the short test excluded new users and increased support contacts. Extend the experiment to a representative cohort before deciding whether the engagement gain justifies the operational cost.
The problem is not technology
AI can draft the email. A feed can fill every empty minute. Keen gives you a deliberate daily practice for the mental abilities you still want to own.
Personalized beyond “easy, medium, hard”
Keen changes the subject matter, ambiguity, time pressure, memory load, answer format, and reasoning depth—not just a level number.
Evidence evaluation · Technology
Your mind, over time
Daily practice adapts. Monthly checkups stay more consistent, giving you a clearer comparison across time and task formats.
Example report
Deep focus 74
Reasoning 82
Recall 68
Next week adds two longer reading sessions while keeping the subject matter familiar.
18 minutes · 5 skill areas
What Keen will—and will not—promise
The old brain-game category reached too far. Keen should earn trust by being precise about what the product measures and what it does not.
Keen does not diagnose disease, raise IQ, or promise to prevent cognitive decline. It helps you practice and observe performance inside the product.
No browser extension, screen monitoring, or reading your work. Your profile is built only from the exercises you intentionally complete.
Focus, recall, reasoning, and expression are different abilities. Keen shows ranges, trends, and uncertainty rather than false precision.
Sessions are demanding enough to matter, short enough to finish, and varied enough to become a ritual instead of homework.
Start small. Learn fast.
A short mix of reading, reasoning, recall, and writing establishes an initial range—not a permanent label.
Ten minutes, assembled for your goals and calibrated from the answers, timing, confidence, and mistakes you make.
A more consistent benchmark helps separate actual movement from a good day, a bad day, or familiarity with one format.
Private beta
Join the founding cohort and help shape a daily cognitive workout worth keeping.