Screen Color Tester

What is Screen Color Tester?

The Screen Color Tester fills your entire screen with a solid color to help you detect dead, stuck, or hot pixels on your monitor. Cycle through red, green, blue, white, and black backgrounds to spot any pixel anomalies against uniform color fields.

How to use

1. Click a color button or press arrow keys to fill the screen with that solid color.
2. Examine your entire screen carefully for any dots that don't match the background color.
3. Cycle through all colors — dead pixels show as black dots, stuck pixels show as colored dots on non-matching backgrounds.

Result

Testing a new 27-inch monitor — cycle through pure red, green, blue, white, and black. A stuck pixel appears as a bright green dot on the pure red screen, confirming a sub-pixel defect.

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