Device diagnostics

See what's working on your hardware. Free tests for your keyboard, mouse, screen, and refresh rate, each showing exactly what's wrong instead of a single pass/fail.

Keyboard Test
Check every key on your keyboard works.
Dead Pixel Test
Check your screen for dead or stuck pixels.
Mouse Test
Check your mouse's buttons, scroll wheel, and cursor tracking.
Monitor Refresh Rate Test
Check your monitor, laptop, or phone's real refresh rate.