Test your monitor's color depth, gradient smoothness, and banding. A good display renders smooth, seamless transitions from black to white (or any color). Visible steps indicate 8-bit vs 10-bit panel limitations or poor calibration.
A color gradient test evaluates your monitor's ability to display smooth color transitions across its full tonal range. By filling the screen with gradients from black to pure colors, you can assess bit depth, identify banding artifacts, and verify that your display is rendering gradients smoothly — essential for photography, video editing, and design work.
64 levels per channel. Visible banding on gradients. Uses FRC dithering to simulate 8-bit. Common on budget monitors and older laptop displays.
256 levels per channel. Smooth gradients for most content. The standard for consumer monitors. Suitable for general use, gaming, and casual photo editing.
1,024 levels per channel. Virtually invisible banding. Required for HDR content and professional color grading. Common on IPS and OLED professional displays.
More free tools to check your setup.
Calibrate your monitor brightness and contrast using ANSI, PLUGE, and near-black/white test patterns.
Test your monitor for dead pixels, stuck pixels, and screen uniformity with our professional color testing tool.
Check your display color depth and view gradient test patterns to detect 8-bit vs 10-bit color banding.
Simplified Ishihara-style color vision screening. Check for red-green and blue-yellow color vision deficiency using 8 colored dot plates.
Test HDR display performance: peak brightness, shadow detail, contrast ratio, and color volume using Canvas-rendered test patterns.
In-depth guides on monitor calibration, color accuracy, and display evaluation.
A 2026 roundup of hardware testing tools, from browser-based no-install checks for mice and screens to GPU stress tests and system monitoring.
Bright dot on your display? Learn the difference between dead vs. stuck pixels and use our free Stuck Pixel Fixer to flash them back to life without leaving your browser.
Found a bright dot on screen? Use our free Screen Test to locate stuck pixels, try safe fixes, and know when to claim warranty.
Corners glowing or bright patches? Use our Screen Test to tell IPS glow from backlight bleed and decide if you should RMA.
A black dot on white is usually a dead pixel. A bright colored dot on black is usually a stuck pixel. Here is how to check before you try a fix or ask for a return.
New monitor? Run this QC checklist with our Screen Test to find dead pixels, bleed, and defects before your return window closes.