Colormind.io - A color palette generator powered by deep learning.
Paleta - Extract the dominant colors from any image.
Colllor - With Colllor it is much easier to generate a consistent color palette with just a few clicks.
Image Color Summarizer - The web service provides statistics describing color characteristics of an image identified by URL.
Color Palette Generator - Enter the URL of an image and find its color palette
ColorTag - ColorTag is an API for color detection.