Simple Screen Tester helps you detect dead pixels on your mobile device screen. Mobile device screens contain only three types of pixels: red, green, and blue. Any other color is a combination of these three.

This app provides a separate page for each base color so you can check each type of pixel separately. Look at the screen carefully to notice black or white dots on red, green, or blue-filled screens.

Tip: Clean your screen with a soft cloth before testing so dust particles and fingerprints won't interfere with the test.