The hexadecimal color code #66DE3B represents a medium shade in the green family. In the RGB color model, this color is composed of 102 red, 222 green, and 59 blue, which translates to approximately 40% red, 87% green, and 23% blue. This makes it a moderately saturated color with cool undertones that can evoke different emotional responses depending on its application.
When analyzed in the HSL (Hue, Saturation, Lightness) color space, #66DE3B has a hue of 104 degrees, a saturation level of 71%, and a lightness value of 55%. The hue angle of 104° places this color firmly in the green spectrum. In the HSV/HSB color model, this translates to a hue of 104°, saturation of 73%, and brightness/value of 87%.
For print applications using the CMYK color model, #66DE3B would be reproduced using 54% cyan, 0% magenta, 73% yellow, and 13% black. The closest web-safe color is #66CC33, which may be useful for ensuring compatibility across older displays and systems.
This color works well in various design contexts. With its medium lightness, it's versatile enough for both foreground elements and subtle backgrounds. The high saturation makes this color vibrant and attention-grabbing, ideal for call-to-action buttons, highlights, and accent elements. When pairing #66DE3B with other colors, consider its complementary color at hue 284° for maximum contrast, or use analogous colors within 30° of its hue for harmonious combinations. The decimal representation of this color is 6741563, which can be useful in certain programming contexts.
🔢 Color Conversion Codes for #66DE3B
Tailwind CSS
lime-500
HEX
#66DE3B
RGB
rgb(102, 222, 59)
RGB %
40%, 87%, 23%
HSL
hsl(104, 71%, 55%)
HSV
hsv(104, 73%, 87%)
CMYK
54%, 0%, 73%, 13%
Decimal
6741563
Web Safe
#66CC33
🎨 Color Schemes for #66DE3B
Complementary
Analogous
Triadic
Split Complementary
Tetradic (Rectangle)
🔄 Alternatives to #66DE3B
🌗 Shades and Tints of #66DE3B
Shades (adding black)
Tints (adding white)
🎚️ Tones of #66DE3B
Tones (adding gray / desaturating)
🌈 Hue Variations of #66DE3B
Hue Variations (shifting the color spectrum)
👁️ Preview of #66DE3B in Use
Text on #66DE3B
This demonstrates text readability on the color background. (Click to edit)
#66DE3B as Text
This shows the color used as text on white. (Click to edit)
👓 Color Blindness Simulation for #66DE3B
Check how a color is perceived by people with different types of color blindness to create more accessible designs. Understanding color perception helps ensure your content is accessible to everyone.
Cool Green is a medium, vibrant, cool green color with a hue angle of 104°, saturation of 71%, and lightness of 55%. Its RGB value is (102, 222, 59) and its CMYK breakdown is C:54% M:0% Y:73% K:13%.
This is a Spring (Vital) color palette archetype. Nature, Growth, Harmony, Health. Green suggests stability and endurance, bridging the warm and cool colors.
Frequently Asked Questions About #66DE3B
What is the HEX code for Cool Green? +
The HEX code for Cool Green is #66DE3B. In CSS you can use it directly as color: #66DE3B; or as a background: background-color: #66DE3B;. The three-character shorthand is not available for this color since it cannot be reduced without changing the value. Use the full six-character hex for accurate reproduction in any web or design project.
What is the RGB value of #66DE3B? +
The RGB value of #66DE3B is rgb(102, 222, 59). This means the color contains 102 out of 255 parts red, 222 out of 255 parts green, and 59 out of 255 parts blue. Red is the weakest (with blue dominant) channel in this color mix. You can use the full RGB function in any CSS property: color: rgb(102, 222, 59);
What is the HSL value of #66DE3B? +
The HSL value of #66DE3B is hsl(104, 71%, 55%). The hue is 104°, placing it in the green family on the color wheel. The saturation is 71%, making it vibrant. The lightness is 55%, making it medium. HSL is the most useful format for programmatic color manipulation in CSS, as you can easily adjust lightness to create tints and shades.
Is #66DE3B a warm or cool color? +
#66DE3B is classified as a cool color based on its hue angle of 104°. Cool colors — blues, greens, and purples — evoke calm, trust, and professionalism. They tend to recede visually and create a feeling of space. In design, cool colors are often used for technology, healthcare, and finance brands, as well as anywhere a sense of calm or reliability is needed.
What is the CMYK value of #66DE3B? +
The approximate CMYK value of #66DE3B is C:54% M:0% Y:73% K:13%. CMYK (Cyan, Magenta, Yellow, Key/Black) is the color model used in physical printing. Unlike RGB which mixes light additively on screens, CMYK mixes inks subtractively on paper. Note that the RGB-to-CMYK conversion is an approximation — screen colors and print colors exist in different color gamuts, and some screen colors cannot be exactly reproduced in print. For precise print work, consult a professional print color profile or Pantone matching system.
