What to do
Use the gray, white, and dark patterns fullscreen. Give your eyes a moment to adjust to each tone.
Screen Uniformity Test
Check monitor uniformity with white, gray, and near-black panel grids sized for full-screen inspection.
In fullscreen, press Esc or tap the test area to exit.
Local history
Save a result to keep it in this browser. History holds your five most recent saved results for this test.
No saved results yet.
How to use this test
What to look for
Look for brighter, darker, or tinted patches in what should be one even color.
Patterns provide visual references for your own inspection. Refresh estimates come from animation callbacks, not direct panel telemetry. Lighting, display processing, viewing angle, and browser behavior affect results.