HumanTestKit

Aim Test

Thirty targets, one at a time. Measures how fast and how cleanly your hand follows your eyes.

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How the test works

Click or tap the round Start button in the middle of the box. From that moment, 30 targets appear one after another at random places. Each target is a ringed circle 52 pixels wide. Hit it, and the next one appears somewhere else in the box, normally well away from the last one, so you have to move every time. Unlike the reaction time test, the clock here measures not only how fast you respond but how quickly you find and reach each target.

Only a press inside the circle counts as a hit. The test checks the distance from your press to the centre of the target, so clipping the very edge from outside does not count. A press anywhere else in the box is a miss and leaves a small red mark for a moment. Misses do not end the round; you keep going until all 30 targets are down.

Above the box you can follow your progress live: how many targets you have hit, your running average and your accuracy. Reset stops the round at any time.

What the score means

When the 30th target falls, the result card shows:

  • Average per target: the mean time from the moment each target appears to the moment you hit it, in milliseconds. This is your main score and it is saved as your personal best in this browser (lower is better).
  • Accuracy: hits divided by all your presses in the box. With no misses it is 100%.
  • Misses: presses that landed outside the target.
  • Total time: from your press on Start to the last hit.

Misses have no separate penalty, but they cost you time: every miss is a moment when you were not hitting the target. That is why spraying presses rarely beats a calm, accurate run. If your accuracy is 90% or higher the card calls it a steady hand; below that it suggests slowing down slightly.

There is no "typical" marker on the comparison bar. Aim results depend strongly on the target size, the distance, the screen size and the device, and we know of no published reference value for this exact setup. Compare yourself with your own history: the card shows a small chart of your recent results.

The science of pointing: Fitts' law

In 1954 the psychologist Paul Fitts published "The information capacity of the human motor system in controlling the amplitude of movement" in the Journal of Experimental Psychology. He showed that the time needed to reach a target depends on two things: how far away it is and how big it is. Far, small targets take longest; near, large ones are quickest. More precisely, movement time grows with the logarithm of the ratio between distance and target width, a quantity Fitts called the index of difficulty, measured in bits.

Decades later, I. Scott MacKenzie (1992, Human–Computer Interaction) showed how well the law describes pointing with a mouse and other computer input devices and popularised the form used today: movement time = a + b × log₂(distance ÷ width + 1). This is why buttons in good interfaces are large and close to where your pointer already is.

In this test the target size stays fixed at 52 pixels while the distance changes from one target to the next. Your average is therefore a mix of easy, short jumps and harder, long ones. A bigger screen means longer distances and usually a slower average, which is one more reason to compare results only on the same device.

How to improve your aim

  1. Look first, then move. Your eyes should land on the new target before your hand starts travelling.
  2. One smooth movement. Good aim is a fast main movement followed by a tiny correction, not a series of small jerks.
  3. Mouse sensitivity. If you keep overshooting, lower the pointer speed in your system settings; if you need several pushes to cross the box, raise it. Change it in small steps and stick with one setting for a while.
  4. Arm and wrist. Gamers often use the arm for long moves and the wrist or fingers for fine ones. A larger mouse pad gives you room to do that.
  5. Accuracy first. Aim for 100% for a few rounds, then gradually speed up.

On a phone, use the finger you naturally point with and keep the phone on a table if you can. Touch is direct, but your finger hides the target as it lands.

Limits of this test

Your time includes your screen's refresh and your mouse, trackpad or touchscreen delay. A mouse and a touchscreen give very different numbers, and so do small and large screens. The test needs a pointer: it cannot be played with a keyboard. It is a game for practice and curiosity, not a measurement of any medical condition. The hand tremor test shows how steady your hand is while it holds still, but it is not a medical test either. If you notice a new tremor or loss of control in your hands, talk to a doctor.

Want to see raw finger speed instead of precision? Try the CPS test. More tests like these are on the reflex and speed tests page.

Sources

  • Fitts, P. M. (1954). The information capacity of the human motor system in controlling the amplitude of movement. Journal of Experimental Psychology, 47(6), 381–391.
  • MacKenzie, I. S. (1992). Fitts' law as a research and design tool in human–computer interaction. Human–Computer Interaction, 7(1), 91–139.

Frequently asked questions

How is my aim score calculated?

Your main score is the average time per target: the mean time from the moment each of the 30 targets appears until you hit it, in milliseconds. Accuracy, misses and total time are shown next to it.

What counts as a miss?

Any press inside the box that does not land inside the target circle, including a press just outside its edge. Misses do not end the round, but they cost you time.

Is it better to be fast or accurate?

Both count, but accuracy usually wins. Every miss adds time to your average, so a calm run with few misses tends to beat a fast but scattered one.

Why is my score different on my phone and my computer?

Screen size changes the distances between targets, and a finger behaves very differently from a mouse. Fitts' law predicts that longer distances take longer, so only compare results made on the same device.

What is Fitts' law?

A rule described by Paul Fitts in 1954: the time needed to point at a target grows with the logarithm of its distance divided by its size. Far, small targets take longest.

Does mouse sensitivity matter?

Yes. Too high and you overshoot; too low and you need several pushes. Pick a setting where one smooth movement crosses most of the box, then keep it while you practise.

Can I play with a keyboard?

No. The test measures pointing, so it needs a mouse, trackpad or touchscreen.

What's next?