@drwpow there are some nice ones like #ColourPicker on #Linux, but if you need something beyond "what color is this pixel" and/or "how does #00FF00 & #Ff8000 on #000000 look like?" then https://color.adobe.com is propably the way to go...

Unless you do industrial design for products, then you basically need #RAL and/or #PANTONE reference #colours.

Also @randomColorContrasts is a cool bot sometimes offering good and inspiring colour pairs...

@randomColorContrasts how about

#FF8000 [#Computer #Amber]
vs.
#00FF00 [Computer #Green] ?

@wakame @puniko @schratze

Call me oldscool but my CLI / TUI has only two colors on black background:
#00FF00 [green] & #FF8000 [amber]...

@Kencf618033 same, but I find it less eye-straining and very relaxing.

In fact, I configure my terminal to be green (#00FF00)/amber (#FF8000) on black (#000000)...

https://www.youtube.com/watch?v=RuZUPpmXfT0 via @lazygamereviews