Test your display fullscreen
Cycle through solid colours, grids, gradients and dead-pixel patterns to spot dead / stuck pixels, backlight bleed, colour shift and ghosting on your Mac / iPhone / iPad — runs in the browser, no install.
Or jump straight to a pattern
ads_click
Click / tapNext pattern
swipe
Swipe left–rightChange pattern (touch)
keyboard
← → keysMove · Esc to exit
Choose a pattern
—
1 / 1
touch_app
Click/tap = next pattern · swipe to change · move the mouse for controls · press Esc to exit