ScreenTest - Dead Pixel Check

Screen Test is a lightweight, privacy-focused app that helps you check your iPhone and iPad display quality with 10 professional screen tests. TESTS INCLUDED: - Dead Pixel Test - Detect dead or stuck pixels with solid color backgrounds - Touch Screen Test - Find dead zones that don't register touch input - Multi Touch Test - Check how many simultaneous touch points your screen supports - Color Accuracy Test - Verify color reproduction with RGB gradients, grayscale, and SMPTE color bars - Screen Uniformity Test - Detect backlight bleeding and uneven brightness - Contrast Test - Check contrast ratio with checkerboard and stripe patterns - Grid / Line Test - Detect screen distortion with grid, crosshair, and circle patterns - Response Time Test - Check for ghosting and motion blur with moving objects - Brightness Test - Test screen brightness levels from 0% to 100% - Burn-in Test - Detect OLED burn-in and image retention with special patterns DEVICE INFORMATION: - View detailed specs: device model, chip, iOS version, RAM, storage - Screen info: size, resolution, refresh rate, aspect ratio, density WHY SCREEN TEST? - Ultra lightweight - under 500KB - No ads, no tracking, no analytics - No internet connection required - Works completely offline - Supports 20 languages - Dark and Light themes - Supports all iPhones including iPhone 17 series Perfect for checking a new or used phone before purchase, verifying screen repairs, or testing display quality.