The color palette used for color selection before a designer give color to wireframe websites and applications that have been created. The choice of colors adapted to the brand and characteristics of the product which will have an impact on the thinking of each user of the product.
At Affapress.com we use websites that provide the color palette, while the list of the sites is:
Flat UI Color flatuicolors.com
Color Hunt colorhunt.co
LOL Color lolcolors.com
Adobe Color CC color.adobe.com
Color Drop colordrop.io
Material Google Color material.io