Tetradic color scheme
A tetrad is a color scheme, a special variant of the dual color scheme, with the equal distance between all colors. All four colors are distributed evenly around the color wheel, causing there is no clear dominance of one color. The scheme is always vibrant, nervous and colorful, there is equal tension between all colors. Tetrad is very aggressive color scheme, requiring very good planning and very sensitive approach to relations of these colors.
Any set of shades of all three colors could be used with a tetrad, but the strongest effect and most vibrant palettes are produced with bold, saturated shades.
Within the Paletton application use the Tetrad (4-color) option to create split-contrast schemes. Set the distance from the base color complement by dragging one of those two supplement color, or by clicking the angle gadget and entering the value manually. The desired value to get a tetrad is 90°.