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I/O Checkup
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Contrast Test

Check monitor contrast visibility using stepped dark-to-light reference blocks.

In fullscreen, press Esc or tap the test area to exit.

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What did you see?

Local history

Save a result to keep it in this browser. History holds your five most recent saved results for this test.

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How to use this test

What to do

Open the pattern fullscreen and look for adjacent steps that blend together at either end of the scale.

What to look for

Give your eyes time to adjust, then compare after a small change to the display settings.

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.