ColorTag is described as 'API for color detection. Taking an image file (or URL) as input ColorTag produces a list of text labels and hex RGB values that can be then used as tags for a certain image or item' and is an website in the Photos & Graphics category. There are more than 10 alternatives to ColorTag, not only websites but also apps for Mac, Windows, Linux and Python. The best alternative is TinEye Color extraction, which is free. Other great sites and apps similar to ColorTag are Colormind (Free), Color Hunter (Free), Image Color Summarizer (Free) and PicColor (Paid).
Color Hunter is a place to find and make color palettes created from images. You can search by tag or hex color code or image URL. If you have an image, you can upload it and get a color palette based on the colors in the image.
The web service provides statistics describing color characteristics of an image identified by URL. Summary data indicate the single RGB color that best represents the image, along with average hue and saturation values and RGB and HSV histograms.
PicColor is an automated and accurate color extraction solution designed to extract all relevant colors from a regular image. It processes the images, carefully separates the main object from its background, and accurately extracts its color.
Whats Its Color is an image-color processing utility that will evaluate an image and give you the image's primary and complementary dominant colors of an image, how many visually unique colors are in an image, and the top ten visually unique colors in an image.
Color Palette Generator make color schemes. Enter the URL of an image to get a color palette that matches the image. This is useful for coming up with a website color scheme that matches a stock photo.
This application allows you to create a color palette from the image. Just drag and drop the image on the window, and save the palette in the Color Panel. You can to save the color palette to a file and use it on another Mac too. ? Generates a color palette from images.