Monitor test
Setting up a new monitor, or buying used? Run through these checks before the return window closes — dead pixels, backlight bleed, uniformity, contrast, colour and gradient banding.
Dead Pixel Test
Cycle solid colours to find unlit pixels.
Stuck Pixel Test
Cycle through RGB to spot pixels lit the wrong colour.
Backlight Bleed Test
A very dark field to spot light leaking from the edges.
Screen Uniformity Test
Check for patches, tints and clouding across a flat field.
Contrast Test
A stepped greyscale ramp to check separation near black and white.
Gradient Test
A smooth black-to-white ramp — watch for visible banding.
Colour Test
RGB, grayscale and primary hues in one place.
Brightness Test
A dimmable white field for comparing brightness across a display.
Ghosting Test
A moving block — watch for trailing behind the edges.
Refresh Rate Test
An in-browser estimate of on-screen frame timing.
Resolution Test
Viewport size, device pixel ratio and colour gamut.