What does a monitor color test do?
A monitor color test fills a browser window with solid red, green, blue, cyan, magenta, yellow, white, black, or gray. It can make a visible tint or uneven area easier to notice. This is a visual comparison of the output you see, not a color measurement.
The monitor color test on this site reports the RGB code sent to the browser. The display profile, operating system, night-light filter, HDR processing, brightness, browser, and ambient light can all affect appearance. A gray or white field that looks different from what you expected does not prove the display is inaccurate.
What is display calibration?
Calibration adjusts a display toward a defined appearance target. Operating systems provide visual controls that can adjust some display properties; measurement-based workflows use a sensor and software profile. Monitor controls, operating-system calibration, color-managed apps, and hardware colorimeters serve different jobs.
Windows documents separate display-color and HDR-calibration workflows. Their requirements depend on the system and display. A generic browser color chart cannot change a monitor’s on-screen settings, create a color profile, measure its gamut, or verify calibration.
Is DisplayCAL the same as an online monitor color test?
No. DisplayCAL describes itself as display-calibration and profiling software built around ArgyllCMS and measurement instruments. It belongs to a separate calibration workflow. ScreenCheckup displays browser color patterns for visual inspection; it does not run DisplayCAL, create an ICC profile, or replace a sensor-based measurement.
When should I use a screen color test or a calibrator?
Use a screen color test to inspect visible differences, confirm that a color field displays, or compare the same screen before and after a settings change. For color-critical work, use the workflow and target required by your application or organization; measurement-based work generally needs the appropriate colorimeter and software.
If the screen seems tinted or uneven, compare white and gray fields at comfortable brightness with strong filters turned off. If the goal is an accurate color profile, follow your operating system and monitor instructions rather than treating a browser color picker as a calibrator.
Can a website measure monitor color accuracy?
No. A browser cannot measure a monitor’s physical light output. This page does not calculate Delta E, color gamut coverage such as sRGB or DCI-P3, white point, gamma 2.2, HDR performance, or brightness in nits; it also cannot write a monitor profile or certify accuracy. The method page lists the exact RGB patterns and limits for this visual check.
Sources & further reading
Manufacturer references checked on . Model-specific guidance does not apply to every display.
- DisplayCAL: Display Calibration and Characterization
- Microsoft Support: Change display brightness and color in Windows
- Microsoft Support: Calibrate your HDR display using the Windows HDR Calibration app
Read our visual inspection method for exact pattern values and software verification limits. Report a correction if a claim or source needs attention.