🎯Play Aim Trainer

This is the simplest possible measurement of pointing performance, and it maps onto a genuinely old piece of research. Fitts's law, published in 1954, says the time to hit a target depends on how far away it is and how big it is — specifically on the ratio between the two.

That is why the targets here shrink as you go. The distance stays roughly constant because placement is random, but the difficulty climbs steadily as the target gets smaller, which is exactly the variable Fitts's law isolates. Your average reaction time rising over a round is the law happening in real time.

Two numbers are worth watching. Hits measure raw throughput. Average reaction measures how efficiently you move, and it is the one that improves with practice — most people can take a hundred milliseconds off their average within a few sessions by stopping the habit of over-correcting near the target.

Misses are counted separately and reported as accuracy, so spraying clicks does not help.