Tool categories
Count visible patches 223-254 on white background. All visible = healthy. Missing high = clipped highlights.
White Level Test is a free, browser-based white level / clipped highlights test.
A white level test (or clipped highlights test) checks whether your monitor distinguishes near-white shades from pure white. We display 32 patches at RGB values 223 through 254 on pure white. A correctly calibrated monitor shows all 32. A monitor with clipped whites merges high values into solid white, hiding cloud detail in photos, snow texture in video, and bright UI elements.
White Level Test FAQ
11-step grayscale ladder to verify brightness, contrast, and gamma calibration
Checkerboard vs 50% gray squint test for contrast and gamma calibration
Compute pixels per inch, dot pitch, aspect ratio and megapixels for any display from resolution + diagonal
Type any two of width, height, or ratio. Auto-simplifies to lowest integer terms and renders a live preview
Compute diagonal, width, height and visible area from aspect ratio plus any one dimension — in inches and cm
Optimal TV/monitor viewing distance by THX (36° FoV), SMPTE (30° FoV), and the 4K/8K resolving-limit
23 tools · 4 Web Stories
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Monitor reality check
1000Hz Is Real. Worth $999?
LG's UltraGear 25G590B is the first native 1000Hz 1080p monitor. Check the fine print first.
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Phone buying guide
PWM-sensitive? Test the phone, not the promise
Display specs narrow the shortlist, but no OLED is comfortable for everyone.
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Screen flicker test
Your screen may be flickering
Many displays dim by switching the backlight on and off hundreds of times a second.
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Monitor check
Dark scenes losing detail?
Your monitor may be turning several near-black shades into one flat black.
Source-based buyer analysis of the first native 1000Hz monitor: verified specs, the 1 ms GtG contradiction, the MBR Pro versus G-SYNC/FreeSync trade-off, dated prices against 480Hz OLED and dual-mode alternatives, and five delivery-day browser tests.
