Dark Blue is a
cool dark color with the hex code #3300B3.
This vibrant hue can be represented as RGB
51, 0, 179 in digital design or CMYK 72%, 100%, 0%, 30% for print applications.
Find matching Pantone color.
Dark Blue
#3300B3
Dark Blue color values
- HEX
- #3300B3
- RGB
- 51, 0, 179
- HSL
- 257°, 100%, 35%
- CMYK
- 72, 100, 0, 30
Shades & tints
Darker Lighter
About this color
Dark Blue sits at 257° on the color wheel with 100% saturation and 35% lightness, placing it in the blue-violet segment of the spectrum. With saturation at 100%, this is a high-chroma color: the kind that anchors palettes and demands considered placement. The lower lightness gives it weight and depth, lending gravity to any palette it enters.
In digital environments, Dark Blue is rendered as rgb(51, 0, 179), where the blue channel is highest at 179, producing a strongly blue character. High saturation combined with low lightness creates deep, jewel-toned results — useful for premium UI elements, hover states, and focused interaction areas.
For print, Dark Blue translates to a CMYK breakdown of 72C 100M 0Y 30K. With a moderate key (30%), this color uses black to deepen the chromatic channels rather than replace them, a profile that typically holds up well in both offset and digital print. 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: #3300B3;
--brand-primary-rgb: 51, 0, 179;
}Define as a CSS custom property for consistent theming across your site.
Tailwind Config
colors: {
brand: '#3300B3',
}
Add to your Tailwind config to use classes like bg-brand.
Print Design (CMYK)
C: 72%
M: 100%
Y: 0%
K: 30%Use these CMYK values in Adobe Illustrator, InDesign, or print specifications.
RGB for Screens
rgb(51, 0, 179)
rgba(51, 0, 179, 0.8)Use RGB notation for compatibility or add alpha channel for transparency.
Frequently asked questions
What color is #3300B3?
#3300B3 is Dark Blue, a cool dark color with RGB values of 51, 0, 179. It has a hue of 257°, 100%
saturation, and 35% lightness in the HSL color
space.
What is the RGB value of #3300B3?
The RGB color code for #3300B3 is rgb(51, 0, 179). This means it contains 51 red,
0 green, and 179 blue in the RGB color model.
Is Dark Blue a warm or cool color?
Dark Blue (#3300B3) is a cool color with a hue between 120-300° on the color wheel.
How do I use #3300B3 in CSS?
You can use #3300B3 in CSS with:
background-color: #3300B3; or color: #3300B3; or as an RGB value: rgb(51, 0, 179). For print design, use CMYK: 72%, 100%, 0%, 30%.