Dark Blue is a
cool light color with the hex code #423FF3.
This vibrant hue can be represented as RGB
66, 63, 243 in digital design or CMYK 73%, 74%, 0%, 5% for print applications.
Find matching Pantone color.
Dark Blue
#423FF3
Dark Blue color values
- HEX
- #423FF3
- RGB
- 66, 63, 243
- HSL
- 241°, 88%, 60%
- CMYK
- 73, 74, 0, 5
Shades & tints
Darker Lighter
About this color
Dark Blue sits at 241° on the color wheel with 88% saturation and 60% lightness, placing it in the blue segment of the spectrum. With saturation at 88%, this is a high-chroma color: the kind that anchors palettes and demands considered placement. At medium-high lightness, it holds its own on white backgrounds while remaining approachable.
In digital environments, Dark Blue is rendered as rgb(66, 63, 243), where the blue channel is highest at 243, producing a strongly blue character. High saturation at this lightness produces strong contrast against white — effective for CTAs, badges, and elements that need to stop the eye.
For print, Dark Blue translates to a CMYK breakdown of 73C 74M 0Y 5K. With almost no black ink (5%), this color is built almost entirely from process inks: 73% cyan, 74% magenta. This profile tends toward vibrancy in print, though ink density limits on press may affect saturation on coated versus uncoated stock. No brands in the brandkit.pro library currently specify this exact hex as a named brand color.
Color harmonies
Complementary
Analogous
Triadic
Split-Complementary
How to use Dark Blue
CSS Variable
:root {
--brand-primary: #423FF3;
--brand-primary-rgb: 66, 63, 243;
}Define as a CSS custom property for consistent theming across your site.
Tailwind Config
colors: {
brand: '#423FF3',
}
Add to your Tailwind config to use classes like bg-brand.
Print Design (CMYK)
C: 73%
M: 74%
Y: 0%
K: 5%Use these CMYK values in Adobe Illustrator, InDesign, or print specifications.
RGB for Screens
rgb(66, 63, 243)
rgba(66, 63, 243, 0.8)Use RGB notation for compatibility or add alpha channel for transparency.
Brands using similar hue
24 brand s with colors near 241° on the color wheel
Frequently asked questions
What color is #423FF3?
#423FF3 is Dark Blue, a cool light color with RGB values of 66, 63, 243. It has a hue of 241°, 88%
saturation, and 60% lightness in the HSL color
space.
What is the RGB value of #423FF3?
The RGB color code for #423FF3 is rgb(66, 63, 243). This means it contains 66 red,
63 green, and 243 blue in the RGB color model.
Is Dark Blue a warm or cool color?
Dark Blue (#423FF3) is a cool color with a hue between 120-300° on the color wheel.
How do I use #423FF3 in CSS?
You can use #423FF3 in CSS with:
background-color: #423FF3; or color: #423FF3; or as an RGB value: rgb(66, 63, 243). For print design, use CMYK: 73%, 74%, 0%, 5%.