Colllor is a user-friendly website. When you choose a main color (pick the color or input the color value), Colllor will, according to brightness, gray level, blend color and similar color, show you the similar colors that are coordinated with the main color and you can pick the blend color on the right of the Mix bar. Colllor believes that elegant and high-class UI color palettes should be consistent in color. Simple as its theory is, Colllor can help you pick the suitable color palettes.