The hexadecimal color code #183B81 represents a dark shade in the blue family. In the RGB color model, this color is composed of 24 red, 59 green, and 129 blue, which translates to approximately 9% red, 23% green, and 51% 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, #183B81 has a hue of 220 degrees, a saturation level of 69%, and a lightness value of 30%. The hue angle of 220° places this color firmly in the blue spectrum. In the HSV/HSB color model, this translates to a hue of 220°, saturation of 81%, and brightness/value of 51%.
For print applications using the CMYK color model, #183B81 would be reproduced using 81% cyan, 54% magenta, 0% yellow, and 49% black. The closest web-safe color is #003399, 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 #183B81 with other colors, consider its complementary color at hue 40° for maximum contrast, or use analogous colors within 30° of its hue for harmonious combinations. The decimal representation of this color is 1588097, which can be useful in certain programming contexts.
🔢 Color Conversion Codes for #183B81
Tailwind CSS
blue-900
HEX
#183B81
RGB
rgb(24, 59, 129)
RGB %
9%, 23%, 51%
HSL
hsl(220, 69%, 30%)
HSV
hsv(220, 81%, 51%)
CMYK
81%, 54%, 0%, 49%
Decimal
1588097
Web Safe
#003399
🎨 Color Schemes for #183B81
Complementary
Analogous
Triadic
Split Complementary
Tetradic (Rectangle)
🔄 Alternatives to #183B81
🌗 Shades and Tints of #183B81
Shades (adding black)
Tints (adding white)
🎚️ Tones of #183B81
Tones (adding gray / desaturating)
🌈 Hue Variations of #183B81
Hue Variations (shifting the color spectrum)
👁️ Preview of #183B81 in Use
Text on #183B81
This demonstrates text readability on the color background. (Click to edit)
#183B81 as Text
This shows the color used as text on white. (Click to edit)
👓 Color Blindness Simulation for #183B81
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.
Dark Cool Blue is a medium, vibrant, cool blue color with a hue angle of 220°, saturation of 69%, and lightness of 30%. Its RGB value is (24, 59, 129) and its CMYK breakdown is C:81% M:54% Y:0% K:49%.
This is a Summer (Cool) color palette archetype. Trust, Loyalty, Wisdom, Confidence. Blue is considered beneficial to the mind and body.
Frequently Asked Questions About #183B81
What is the HEX code for Dark Cool Blue? +
The HEX code for Dark Cool Blue is #183B81. In CSS you can use it directly as color: #183B81; or as a background: background-color: #183B81;. 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 #183B81? +
The RGB value of #183B81 is rgb(24, 59, 129). This means the color contains 24 out of 255 parts red, 59 out of 255 parts green, and 129 out of 255 parts blue. Red is the moderate channel in this color mix. You can use the full RGB function in any CSS property: color: rgb(24, 59, 129);
What is the HSL value of #183B81? +
The HSL value of #183B81 is hsl(220, 69%, 30%). The hue is 220°, placing it in the blue family on the color wheel. The saturation is 69%, making it vibrant. The lightness is 30%, 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 #183B81 a warm or cool color? +
#183B81 is classified as a cool color based on its hue angle of 220°. 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 #183B81? +
The approximate CMYK value of #183B81 is C:81% M:54% Y:0% K:49%. 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.
