Online Monitor Test is a free multi-functional test that lets you test the contrast and colors of your monitor online. There are two ways you can run the test, either run it online in your browser or download and run it on your Windows machine.

Using Online Monitor Test you can:

1. Determine if your display is displaying grayscale and contrast properly.
2. Test gradients of color across the spectrum to see if you’re getting clear, rich color and true black on your display.
3. Test specific colors against black or individual colors.
4. Use whole-screen colors to check for dead pixels.

No sign up or registration needed.

Try it out at http://tft.vanity.dk/.