Screen Check: Dead Pixel Test

Leeloo Labs LLC

About this app

Screen Check is a simple, fully offline screen testing tool — made for checking
new phones, second-hand devices, or your own display's condition.

FEATURES

• Dead Pixel Test — full-screen solid colors (black, white, red, green, blue).
Tap to switch colors and look for dead pixels, bright spots, or backlight bleed.

• Grayscale Test — 16-step gray scale, black-to-white gradient, and mid gray to
reveal color banding, crushed steps, or uneven backlight.

• Display Info — resolution, diagonal size, pixel density, current and maximum
refresh rate, orientation, and HDR support, read directly from your device.

HOW TO USE

Run a test before buying a new phone, when trading a used device, or anytime you
want to inspect a screen. Inside a test, tap anywhere to switch patterns and
hold for 1.5 seconds to exit.

WHY YOU CAN TRUST IT

• No ads
• No in-app purchases
• No permissions requested
• No internet access — works fully offline
• No data collection of any kind

This application does not collect, store, or transmit any user data.

What’s new

Dead pixel, grayscale and screen spec tests. Offline, no ads, zero permissions.