display test
Screen Sharpness Test
Display fine lines and text patterns to inspect scaling and sharpness.
No accountLocal where possibleRetest anytime
Inspect fine lines and scaling
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
Test input is processed in your browser where possible.
Use the result as evidence, not a guess.
This test checks
- Fine lines
- Text edges
- Scaling
How to read it
A passing browser test confirms that the browser can observe this input/output path.
A failing test narrows the issue but does not by itself prove physical hardware failure.