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I want to check color choices in xcolor, for example for row coloring of a table. Is there a site for

  1. code ⇒ color; as in you play with the code and see what color you get
  2. color ⇒ code; you choose a color and the site provides you with a code.

I am looking for simple experimentation other than compiling a file every time to see how it looks.

Moreover, If I have hex code for a color how do I define the color?

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For your second question, you can use \definecolor and the HTML color model (a 24-bit hexadecimal RGB variant):

\documentclass{article}
\usepackage{xcolor}

\definecolor{mycolor}{HTML}{AFFE90}

\begin{document}

{\color{mycolor}\rule{2cm}{2cm}}

\end{document}

enter image description here

For your first question, there are some on-line sites where you can test your colors; to obtain a matching palette for a given color, I use Color Blender: you select a color and you get matching schemes. For just one color tests, you can also use ColorPicker.

Another very useful tool I use, and that might also be of interest for you, is the chrome extension Eye Dropper which allows you to pick colors from web pages.

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If you happen to use Emacs, you can try Julien D'Anjou's rainbow-mode, which colorizes color expressions with the color they define. This is how it looks for me with the example given by Gonzalo Medina:

This

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If you use Linux, you may like Agave. It generates complements, split complements, triads, tetrads, and analogous and monochromatic schemes; it saves your favorite schemes; it allows you to experiment with the lightness or saturation of a scheme; and it generates random schemes when the well of inspiration has run completely dry.

Not as easy to use but more sophisticated is gpick, which allows you to choose between three color wheels (the usual RGB and two versions of RYB, the artist’s color wheel) and to generate color schemes from images.

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