I kept seeing the same questions over and over on forums:

“Is this a dead pixel or something else?” “Why do I see bright spots only on dark backgrounds?” “Is this fixable or a hardware issue?”

In most cases, the answer is: it’s a panel issue (backlight bleed, pressure damage, or mura), not software.

So I built a simple tool to help people quickly check their screens:

https://www.screenissues.com

What it does:

Fullscreen solid color tests (black, white, RGB) Helps identify: dead pixels vs bright spots backlight bleed uneven brightness (mura) Works instantly in the browser (no install)

Why I made this:

Most people don’t know how to diagnose screen problems. They try:

reinstalling drivers changing settings

But many display issues are actually hardware-related and won’t be fixed by software.

This tool gives a quick, visual way to confirm that in under a minute.

Would love feedback, especially:

What tests/features are missing? Mobile experience improvements? Any edge cases I didn’t cover?