Grayscale Test

Check grayscale steps to understand shadow and highlight visibility.

Grayscale TestRuns locally · nothing is uploaded

Inspect shadow detail, highlight detail and smooth grayscale transitions.

Start enters fullscreen — the pattern fills the whole screen with no other UI on it.
Keyboard: ← previous · → / Space next · Esc finish. Touch: tap the left / right third of the surface, the middle to finish.

What this result means

Display Checkup records visual observations and browser estimates. It cannot certify hardware or decide whether a product must be returned. Compare anything concerning with the seller’s policy.

Related tests

Checks that usually pair well with this one.

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Color Banding Test

Display smooth gradients and look for abrupt steps.

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OLED Test

Inspect near-black behavior, uniformity and image retention on an OLED panel.

Open tool →

Make it a full inspection

Run this test as part of a guided inspection and finish with a downloadable PDF report.

Start guided inspection

Read the guide: How to test a new monitor →

Frequently asked questions

Know the limits before you interpret a result.

Is this a hardware diagnostic?

No. Browser measurements are labeled as reported or estimated, and visual findings remain your own observation.

Does Display Checkup upload my screen data?

No. The tests and inspection record run in your browser. The report is generated locally.