Browser & Device Tests
Test your keyboard, mouse and reflexes, and see what your browser and screen report. Nothing is collected or sent anywhere.
Keyboard TesterPress keys to check that every key on your keyboard works.
Mouse Button TesterTest mouse buttons, double-clicks and the scroll wheel.
Clicks Per Second TestHow fast can you click? 1, 5, 10 or 30-second CPS test.
Spacebar CounterCount spacebar presses — timed challenge or free counting.
Reaction Time TestMeasure your visual reaction time in milliseconds.
Screen Resolution CheckerYour screen resolution, viewport size and device pixel ratio.
Browser InformationYour browser, OS, language, time zone and enabled features.
Online RulerAn on-screen ruler in cm and inches — calibrate it with a card.