How good is your brain, really?
A growing set of short, addictive tests for reaction time, attention, memory, timing and control. Every test feeds one number - your Human Index.
8 tests live · no sign-up · runs entirely in your browser
Multiple Object Tracking
Keep your eyes on a set of identical moving dots as distractors weave through them. Finds how many you can track at once.
Take the test →Tap Speed & APM
How fast can you tap for 10 seconds? Reports taps per second and a StarCraft-style actions-per-minute figure.
Take the test →Trail Making A/B
Connect 1-2-3 in order, then 1-A-2-B alternating. Times how fast you search and switch between two sequences.
Take the test →Reverse Digit Span
Watch a run of digits, then type them back in reverse order. The sequence grows until you slip - how long can you hold?
Take the test →Stroop Test
Name the ink colour, not the word. Measures how much a conflicting word slows you down - your interference cost.
Take the test →Time Estimation
Start and stop a hidden timer to hit target durations from 3 to 13 seconds. Measures how accurately you can track a short interval.
Take the test →Change Blindness
A scene flickers and something changes each cycle. Spot it and click it. Measures how fast you notice what shifted.
Take the test →Number Sense
Two clouds of dots flash by - which colour had more? Finds the ratio at which your approximate-number sense breaks down.
Take the test →About the scores
Everything runs in your browser and your history is stored on this device only. Percentiles compare you against a bundled reference sample. Nothing here is a clinical or diagnostic assessment.