#637c8a

Slate Gray

Closest match (96% match)

Color formats

RGB

rgb(99, 124, 138)

Red, Green, Blue components

HSL

hsl(202, 16%, 46%)

Hue, Saturation, Lightness

CMYK

cmyk(28, 10, 0, 46)

Print color encoding

Luminance

0.189

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#637c8a

#8a7163

Analogous (Adjacent)

#638a85

#637c8a

#63698a

Triadic

#637c8a

#8a637c

#7c8a63

Split complementary

#637c8a

#8a6369

#8a8463

Complete conversion table

HEX

#637C8A

RGB

rgb(99,124,138)

RGBA

rgba(99,124,138, 1)

HSL

hsl(201.54,16.46%,46.47%)

OKLCH (Modern CSS)

oklch(0.57 0.04 232.8)

CSS Variable

--color: #637c8a;

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

4.39

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

4.78

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#637c8a#82828a

ORIG

SIM

Deuteranopia (green)

#637c8a#706f8a

ORIG

SIM

Tritanopia (blue)

#637c8a#646570

ORIG

SIM

Monochrome (color blind)

#637c8a#787878

Mixing guide

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

MIXING PALETTE

57%

32%

11%

RYB PIGMENTS

Ultramarine blue

Pigment

57%

Ivory black

Pigment

32%

Cadmium yellow

Pigment

11%

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)

18.9%

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.

Whale Shark

#607C8E

Night Owl

#5D7B89

Citadel

#6A7F8B

Stormy Oceans

#70818E

Cement

#8A7163

Storm Gray

#63698A

Juniper

#638A85

Strikemaster

#8A637C

Flax Smoke

#7C8A63

Falcon

#8A6369

Nepal

#9BB5C4

Pickled Bluewood

#2F4854