HSV / HSB
Value / Brightness
Similar Colors Names
Color Harmonies (Scheme)
The complementary color of #21ff2b is #ff21f8. When combined, they cancel each other out: this means that they produce a grayscale color. When placed next to each other, they create the strongest contrast.
A triadic color scheme use three colors that are evenly spaced around the color wheel. Triadic color harmonies tend to be quite vibrant, even if you use pale or unsaturated versions of your hues. To use a triadic harmony successfully, the colors should be carefully balanced - let one color dominate (#21ff2b) and use the two others for accent (#2821ff, #ff2821).
The square color scheme has four colors spaced evenly around the color circle. This creates a balance between warm (#ff21f8, #ff9721) and cool (#21ff2b, #2189ff) colors in your design. The square color scheme works best if you let one color be dominant.
Adjacent / Analogous / Analogic
Analogous color schemes use colors that are next to each other on the color wheel. They usually match well and create serene and comfortable designs. The nearest colors, with enough contrast, of #21ff2b are #21ff97 and #89ff21. Choose one color to dominate and a second to support. The third color is used (along with black, white or gray) as an accent.
The split-complementary color scheme is a variation of the complementary color scheme. In addition to the base color #21ff2b, it uses the two colors adjacent to its complement: #9721ff and #ff2189. This color scheme has the same strong visual contrast as the complementary color scheme, but has less tension. The split-complimentary color scheme is often a good choice for beginners, because it is difficult to mess up.
The rectangle or tetradic color scheme uses four colors arranged into two complementary pairs: #21ff2b and his complementary #ff21f8 with #21f8ff #ff2821 or #2821ff #f8ff21. This rich color scheme offers plenty of possibilities for variation. The tetradic color scheme works best if you let one color be dominant. You should also pay attention to the balance between warm and cool colors in your design.
Tints, Shades, and Tones
Adding white to the color: same hue and saturation of #21ff2b, but brighter.
Adding black to the color: same hue and saturation of #21ff2b, but darker.