#00518b

Congress Blue

Closest match (96% match)

Color formats

RGB

rgb(0, 81, 139)

Red, Green, Blue components

HSL

hsl(205, 100%, 27%)

Hue, Saturation, Lightness

CMYK

cmyk(100, 42, 0, 45)

Print color encoding

Luminance

0.077

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#00518b

#8b3a00

Analogous (Adjacent)

#008b80

#00518b

#000b8b

Triadic

#00518b

#8b0051

#518b00

Split complementary

#00518b

#8b000c

#8b7f00

Complete conversion table

HEX

#00518B

RGB

rgb(0,81,139)

RGBA

rgba(0,81,139, 1)

HSL

hsl(205.04,100%,27.25%)

OKLCH (Modern CSS)

oklch(0.43 0.12 248.8)

CSS Variable

--color: #00518b;

Preview

Readability and Typography

Headline Test

This text demonstrates the reading experience on this background color.

Headline Test

This text demonstrates the reading experience on this background color.

UI Component Set

This is an example alert bar using the selected color.

SOLIDSOFTOUTLINE

Product Mockup

4582 •••• •••• 9018

CARDHOLDER

JOHN DOE

VALID

12/28

Mobile application

Customer support

Hi! How can we help you today?

I love this new color! 😍

Data visualization

Weekly growth

+1,240

12.5%

WED

2,450

Contrast

Contrast and readability (WCAG)

On white background

8.24

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

2.55

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#00518b#6b6b8b

ORIG

SIM

Deuteranopia (green)

#00518b#332a8b

ORIG

SIM

Tritanopia (blue)

#00518b#04262b

ORIG

SIM

Monochrome (color blind)

#00518b#4f4f4f

Mixing guide

How to mix this color using physical paints or printing inks.

MIXING PALETTE

47%

45%

RYB PIGMENTS

Ultramarine blue

Pigment

47%

Ivory black

Pigment

45%

Cadmium yellow

Pigment

Unlike light, mixing paints makes colors darker. This simulation mimics the behavior of physical pigments.

Physical properties

Perceptual and light-related properties derived from the digital color.

Spectral relationship

Blue hue

450–495 nm • closest visible-spectrum range

750 nm

380 nm

Visual temperature

Cool

A perceptual warm–cool classification. Kelvin does not apply to an arbitrary interface color.

Cool

Neutral

Warm

Luminance (brightness)

7.7%

Dark • relative luminance

50%

100%

An RGB color is produced by combined screen light, so this range is a visual comparison rather than an exact physical wavelength.

Gradient gallery

Generate premium CSS backgrounds and textures from your color.

Similar & Related Colors

Mathematically computed harmonies, shades, and similar tones for this color.

Dark Denim

#005588

Grand Bleu

#015482

Blue Chip

#1D5699

Night Mode

#234E86

Peru Tan

#8B3A00

Navy Blue

#000B8B

Teal

#008B7F

Fresh Eggplant

#8B0051

Limeade

#518B00

Sangria

#8B000C

Indigo

#5486C5

Prussian Blue

#002254