Train the broad pillars of human intelligence.

Ten evidence-informed exercises, each mapped to a broad cognitive ability from the Cattell–Horn–Carroll model that underpins modern IQ assessment. Difficulty adapts to you in real time — it stays just hard enough to grow.

CortexLab is a training tool for practice and self-improvement. Your Cognitive Index is an estimated performance score based on how you play today — it is not a clinical or diagnostic IQ measurement. Real cognitive assessment requires a licensed professional.