There is no need to paint how important color is in design. A successful color solution is half the success of the project. To help developing designers - a little theory of the color wheel and a selection of links to useful resources.

The basic color wheel is useful in choosing the most appropriate color combination (or will help to harmoniously combine certain shades together). He depicts the basic and well-known since the school rules for mixing the primary colors: red, blue and yellow. If you mix red and yellow - you get orange, blue and yellow will give green, and red with blue - purple. Orange, green and purple are secondary colors. Tertiary colors, like red-violet and violet-blue, are derived from mixing basic with secondary.
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According to color theory, harmonious combinations are used: two opposite colors; any three colors evenly distributed around the circle and forming a triangle; any four colors forming a rectangle (in fact, two pairs of colors opposite each other).

Color Matching Rules
Complementary colors - are located opposite each other. For example, blue and orange, or red and green.
They contrast with each other, well emphasize and highlight the desired element. The best combination comes out when one color is applied as a background, while others are highlighted with accents. Playing with shades and tones diversifies the color scheme and helps to achieve the desired result.
Separation of complementary colors at the expense of three colors. They are also opposite each other, but the overall combination looks more relaxed and diverse by adding a third color.
Similar colors are any three colors that are next to each other. For example, orange, yellow-orange and yellow.
The triad is made up of three colors evenly spaced apart. The scheme of the triad creates a contrast, where one color dominates, and the other two place accents.
Two pairs use four colors together in the form of two sets of complementary colors.
Useful websites
The network has a lot of resources that provide ready-made color palettes, patterns and templates. Below is selected a small list of useful for the designer "color" resources.
OLOURloverswww.colourlovers.com/palettes/most-views/all-time/metaA creative community where people from all over the world lay out ready-made color solutions and patterns. Everything laid out is estimated by users.
Color safecolorsafe.coA website with beautiful and accessible color palettes based on WCAG Guidelines recommendations.
Colorsclrs.ccA simple color palette for web development.
UiGradientsuigradients.com/#PinotNoirA large collection of ready-made color gradients.
Couleurscouleursapp.comConvenient application to "snatch" and save the colors that are displayed on the screen.
Web Color Datawebcolourdata.comMakes a breakdown of any site by color (by numbers and patterns).
Material palettewww.materialpalette.comGenerates a color palette design.
Material Colorsmaterialcolors.comA selection of color samples from Google's Material Design Guidelines.
Material Design Colorswww.designskilz.com/colorsThis small web application helps to visualize design colors and copy them in various formats.
Material Design Palettecodepen.io/addyosmani/full/jlvoCA color palette of 500 color ranges for Android, web and iOS.
Colorscolours.neilorangepeel.comColor by number and location on the palette.
Rrggbbrrgg.bbColor swatches with program numbers.
Fifty Shades Of Gray For Web Designerswww.mynameisq.com/web-lab/fifty_shades_of_greyGrayscale and gray designs for web design.
Fifty Shades Of Gray For Web Designershex.colorrrs.comSite picks up the color.
Material UI Colorswww.materialui.co/colorsGoogle's UI color palette includes primary and secondary colors that can be used for illustrations or web development.
Adobe Color CCcolor.adobe.com/en/create/color-wheelSnatches colors and shades from the external environment - just point the phone camera at something colorful.
Coolorscoolors.co/app/f2ee7a-7c6582-6252aa-f1ffc9-cdc5bbFast color scheme generator for designers.
BADA55.Iobada55.ioThe site offers the most aggressive names for CSS colors.
Palettonpaletton.com/#uid=1000u0kllllaFw0g0qFqFg0w0aFColor scheme for designers.
Colourcodecolourco.deChoice of colors based on hsl. The scheme includes different color combinations.
Color Palette Generatorwww.degraeve.com/color-paletteCreates color schemes. You must enter the image URL to get the color palette that matches the selected picture.
Color Palettes Color Schemeswww.color-hex.com/color-palettes
ColorSchemerwww.colorschemer.com/online.htmlOnline color generating circuit.
Colllorcolllor.comColor palette generator.
Contrast-Awww.dasplankton.de/ContrastAThe application allows users to experiment with color combinations, create their own.
Color hexwww.colorhexa.comWebsite providing information about any color. Just enter any color values in the search field and Color Hex will provide a detailed description, automatically converting to RGB, CMYK, HSL, HSV, CIE-Lab, Hunter-Lab, CIE-Luv, CIE-LCH, XYZ and XYY.
ColorExplorerwww.colorexplorer.comA useful site that provides a whole range of online tools for working with the color palette.
Colorluck7act.ru/colorluck.phpA tool for finding the most varied colors.
