What colors won't hurt your eyes?

Question

Design

Something I won’t pick up a normal combination
https://jsfiddle.net/vkorotenko/6mt48h71/

Answer 1

https://palletton.com

Answer 2

There is also a site https://color.adobe.com/create
This is a service for designers who develop color palettes.
The squares with different colors UNDER the spectrum wheel are the palette. In the center of the palette is a square with a checkmark, this is the starting color. The same color is marked with a circle with a tick on the wheel of the spectrum:
It is good to "try on" combinations and contrasts on this palette.