Free browser-based diagnostics
Screen Test Tools for OLED, Monitors, TVs, and Phones
Start with the complete monitor workflow or choose a focused test for pixels, burn-in, uniformity, gradients, motion, black level, or color. Every tool runs locally in your browser without an account.
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Core display checks
Screen Tester
Run solid colors, gradients, geometry, text, and motion patterns in one fullscreen workspace.
Start testMonitor Test
A guided 10-step check for pixels, black level, uniformity, gradients, geometry, and text clarity.
Start testDead Pixel Test
Cycle through eight solid colors to find dead pixels and stuck subpixels.
Start testScreen Uniformity Test
Adjust gray from 1% to 100% to inspect OLED banding, DSE, mura, and tint.
Start testFocused screen tests
Gradient Test
Check grayscale and RGB transitions for banding and contouring.
Ghosting Test
Compare motion trails and inverse ghosting with adjustable targets.
Backlight Bleed Test
Inspect LCD edges and distinguish fixed bleed from IPS glow.
OLED Display Test
Run a broad color, contrast, and pattern inspection.
OLED Burn-In Test
Check image retention and uneven pixel aging.
Black Screen Test
Inspect black levels, bright pixels, and LCD backlight bleed.
OLED Gray Test
Cycle through 21 fixed gray levels for burn-in and uniformity.
White Screen Test
Find dark pixels, dust, tint, and brightness variation.
iPhone OLED Test
Check an iPhone display for pixel defects, tint, and burn-in.