Monitor Grayscale & Black Level Test
Test monitor contrast, color banding, and black level limits. Includes 256-level gradient chart and OLED black level challenge.
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Grayscale & Black Level Test
Test monitor contrast, banding, and black level limits.
Standard Chart
View 256-level grayscale ramp to check for banding and white saturation.Black Level Challenge
Game mode: Find the faintest hidden square. OLED/10-bit recommended.Turn off lights! Clicking the wrong area ends the test immediately.
About Monitor Grayscale & Black Level Test
Two Testing Modes Available
Evaluate your monitor's grayscale performance with our "Standard Mode" and "Challenge Mode".
1. Standard Chart
- Banding: A high-quality monitor should render smooth, silk-like transitions. Distinct vertical lines indicate low color depth or poor Gamma calibration.
- Contrast: You should distinguish between white (255) vs near-white (254), and black (0) vs near-black (1). Merging indicates "Black Crush" or overexposure.
2. Black Level Challenge
A gamified test for OLED and Mini-LED to test extreme shadow details.
- Spatial Dithering: In "Hell" levels, we simulate brightness below RGB(1,1,1) using algorithms. This showcases the true power of self-emissive pixels.
Best Environment
Perform the challenge in a pitch-black room to avoid ambient reflections.
Frequently Asked Questions
Monitor Grayscale & Black Level Test — Test monitor contrast, color banding, and black level limits. Includes 256-level gradient chart and OLED black level challenge.
Open Monitor Grayscale & Black Level Test in your browser, follow the on-page controls, and get results instantly. No installation is needed.
Yes. It is free to use online with no paid subscription required for core features.
Yes. Open the page in a modern mobile browser. Some hardware tests work best on desktop.
No account is required for basic use. Logging in is optional and used for saving scores or history on some tools.