Free service that decides color scheme with AJAX "Accessibility Color Wheel"

When you insert the mouse in the color wheel, the color of the preview will change in real time. When "Foreground" is the text color, "Background" is the background color, and "Invert" is clicked, the text color and the background color are switched. Also, pressing "Bigger" makes the color wheel even bigger, pressing "Smaller" will make the color wheel smaller.
Accessibility Color Wheel

Also, at the bottom of the page is a color scheme when people with color vision disorder saw it.

The source of this color wheel is this free service. This is also fun.

4096 Color Wheel Version 2.1