It is a browser-based aim trainer developed by a small team (originating from Russia). Unlike downloadable software like KovaaK’s, aim400kg runs on Flash/HTML5 (now entirely HTML5). It focuses on "Target acquisition," "Precision," and "Reflex" scenarios.
The name "400kg" originally referenced the weight of a safe (implying the "weight" of high scores or difficulty), but over time, it has simply become a recognizable brand in the aim training community.
The most famous mode on the site. A user waits for a red screen to turn green, then clicks as fast as possible. The result is measured in milliseconds (ms). Elite human reaction time averages around 150-200ms. This test is often used by gamers to gauge alertness before a session.
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