Free cognitive test
How sharp are you right now?
Three minutes, two validated paradigms, one number. A vigilance test measures your sustained attention and reaction speed. A Stroop test measures your mental control under interference. Together they produce a 0 to 100 score you can track over time.
This is a measurement, not a diagnosis and not an IQ test. One reading is a snapshot; the trend across readings is the signal.
- 1. Vigilance. Tap the moment the panel turns blue. 8 trials, about a minute. Measures sustained attention and raw reaction speed.
- 2. Control. Pick the ink color of the word, not what it reads. 12 trials. Measures your ability to override an automatic response.
Best taken on a phone or with a mouse in hand, somewhere you will not be interrupted for three minutes. Your score is computed in your browser.
Why this matters
The research on cognitive debt
What the evidence says about offloading thinking to AI, why reasoning autonomy is measurable, and what the instrument can and cannot claim.
Read the research→The full instrument
See the adaptive assessment run
A browser demonstration of the adaptive scoring engine behind the Cognitive Autonomy Index.
Open the demo→