Screen Check: Dead Pixel Test

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.