display test
Display Grayscale Test
Use this visual inspection for obvious tinting, crushed tones or uneven neutral rendering.
No accountLocal where possibleRetest anytime
Inspect whether grayscale steps stay neutral and visibly distinct
CSS screen—
Viewport—
Pixel ratio—
Refresh estimate—
DeviceOK can display patterns and estimate browser frame timing, but visual panel defects still require your inspection and professional measurements require dedicated hardware.
Private by design
The pattern is generated locally.
Use the result as evidence, not a guess.
This test checks
- Grayscale neutrality by visual inspection
- Tone separation
How to read it
This is a visual reference, not a calibrated color measurement.
Use a colorimeter for quantitative calibration.