SpeedXG
Dead Pixel Test
Fill the screen with solid colors. A dead pixel stays black. A stuck pixel stays one color on every screen.
Look closely for pixels that never change color. Tap or press a key to cycle.
How to run a dead pixel test
Go fullscreen and cycle colors. Inspect the panel up close. Dust on the glass is not a dead pixel — wipe first. Esc exits fullscreen.
FAQ
Can software fix a dead pixel?
Dead pixels are hardware. Stuck pixels sometimes recover with pixel-massage videos; results vary.
Does this work on a phone?
Yes. Use fullscreen and swipe or tap to change colors.