Two kinds of tests in one place
Skill tests measure you
The reaction time test times how quickly you respond to a colour change, a sound or a go/no-go signal, the aim trainer has five modes (Gridshot, Speed, Tracking, Reflex and Precision) for warming up before you play, and the typing test measures your words per minute in seven languages, shows the keys you miss most and drills them for you. The CPS test counts how many times you can click per second, with dedicated pages for jitter clicking and butterfly clicking, and the spacebar counter does the same for the space bar. Every result can be turned into an image or a "beat my score" link, so you can challenge friends on Discord or anywhere else.
Setup tests check your hardware
The mouse test catches the unwanted double clicks that worn switches produce, the keyboard tester checks every key for chatter and rollover, and the mic test and webcam test check you're ready for calls and streams. The refresh rate test tells you whether your 144 Hz or 240 Hz monitor is actually running at that rate. The dead pixel test fills your screen with solid colours so faulty pixels stand out. And the controller tester shows every button, trigger and stick, with a built-in stick drift check.
Is anything uploaded?
No. Every test runs entirely in your browser. Your clicks, scores and controller inputs are never sent to a server. Personal bests are saved in your browser's own storage on this device, and you can clear them at any time by clearing site data.
How accurate are browser tests?
Very accurate for comparing yourself over time on the same setup. Every result includes a little latency from your equipment: the mouse or touchscreen, the operating system, the browser and the display. A fast gaming mouse on a high-refresh monitor will give slightly better numbers than a laptop trackpad on a 60 Hz screen. Each test page explains what affects its results and how to get the most consistent measurement.