This measures something the reaction test cannot
The main test measures how fast you respond when you already know where to respond. An aim trainer adds the part that actually decides gunfights and sports: finding the target, moving to it, and landing on it. Missing costs you nothing but time, which is exactly how it works in practice.
Your score here will be substantially slower than your simple reaction time, and that gap is the interesting number. If you react in 220 ms and hit targets in 600 ms, roughly 380 ms of that is acquisition and movement. That is the part you can train.
Fitts's law, or why small far targets are brutal
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. Doubling the distance costs you about as much as halving the size. This is Fitts's law, it was published in 1954, and it has survived every attempt to break it since, including on touchscreens.
The practical consequence for aim training: raising your sensitivity shortens the distance your hand travels but shrinks your effective target, and lowering it does the reverse. There is a personal optimum and almost nobody finds it by copying a professional's settings. Find yours by testing here at three sensitivities on three different days, not by reading a settings list.
On a touchscreen your finger is both the pointer and the occlusion — you cannot see what you are about to hit. Phone scores are not comparable to mouse scores and never will be.
How to practise without wasting the practice
- Warm up first. The first set of a session is reliably the worst one, and training on a cold set teaches nothing.
- Keep the session short. Ten to fifteen minutes of focused aim work beats an hour of tired repetition, which mostly trains your errors.
- Change one thing at a time. Sensitivity, grip, monitor distance, chair height — change two and you learn nothing from the result.
- Track the trend, not the session. Your last runs are stored on this device so you can see the direction rather than the noise.
- Fix the desk before the technique. A sticky mousepad edge or a chair that is too low costs more milliseconds than any drill returns.
What this trainer is not
It is a flicking and tracking-free measurement: targets are static once they appear, there is no recoil, no strafing opponent, and no scoring pressure. That makes it a clean baseline and a poor substitute for the game you actually play. Use it to check whether a settings change helped, to warm up before you play, and to see whether your bad night was your aim or your sleep. For everything beyond that, play the game.