#183e79

Chathams Blue

Closest match (90% match)

Color formats

RGB

rgb(24, 62, 121)

Red, Green, Blue components

HSL

hsl(216, 67%, 28%)

Hue, Saturation, Lightness

CMYK

cmyk(80, 49, 0, 53)

Print color encoding

Luminance

0.050

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#183e79

#795318

Analogous (Adjacent)

#186e79

#183e79

#221879

Triadic

#183e79

#79183e

#3e7918

Split complementary

#183e79

#792218

#6f7918

Complete conversion table

HEX

#183E79

RGB

rgb(24,62,121)

RGBA

rgba(24,62,121, 1)

HSL

hsl(216.49,66.9%,28.43%)

OKLCH (Modern CSS)

oklch(0.37 0.11 259.1)

CSS Variable

--color: #183e79;

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

10.48

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

2.00

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#183e79#585979

ORIG

SIM

Deuteranopia (green)

#183e79#3c3579

ORIG

SIM

Tritanopia (blue)

#183e79#1a272c

ORIG

SIM

Monochrome (color blind)

#183e79#3f3f3f

Mixing guide

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

MIXING PALETTE

53%

42%

RYB PIGMENTS

Ivory black

Pigment

53%

Ultramarine blue

Pigment

42%

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)

5.0%

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.

Maritime Outpost

#1E4581

Tardis Blue

#003B6F

Lost in Space

#03386A

Nightlife

#27426B

Russet

#795318

Deep Koamaru

#221879

Elm

#186F79

Claret

#79183E

Bilbao

#3E7918

Mocha

#792318

San Marino

#5871B2

Stratos

#001144