#428faa

Steel Blue

Closest match (90% match)

Color formats

RGB

rgb(66, 143, 170)

Red, Green, Blue components

HSL

hsl(196, 44%, 46%)

Hue, Saturation, Lightness

CMYK

cmyk(61, 16, 0, 33)

Print color encoding

Luminance

0.237

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#428faa

#aa5d42

Analogous (Adjacent)

#42aa91

#428faa

#425baa

Triadic

#428faa

#aa428f

#8faa42

Split complementary

#428faa

#aa425b

#aa9142

Complete conversion table

HEX

#428FAA

RGB

rgb(66,143,170)

RGBA

rgba(66,143,170, 1)

HSL

hsl(195.58,44.07%,46.27%)

OKLCH (Modern CSS)

oklch(0.61 0.09 223.9)

CSS Variable

--color: #428faa;

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

3.66

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

5.74

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#428faa#9b9baa

ORIG

SIM

Deuteranopia (green)

#428faa#6861aa

ORIG

SIM

Tritanopia (blue)

#428faa#46606b

ORIG

SIM

Monochrome (color blind)

#428faa#868686

Mixing guide

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

MIXING PALETTE

69%

16%

15%

RYB PIGMENTS

Ultramarine blue

Pigment

69%

Cadmium yellow

Pigment

16%

Ivory black

Pigment

15%

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

Cyan hue

485–500 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)

23.7%

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.

Mediterranean Sea

#1E8CAB

Blue Moon

#3992A8

Corfu Waters

#008AAD

Munsell Blue

#0093AF

Brown Rust

#AA5D42

San Marino

#425BAA

Keppel

#42AA91

Rouge

#AA428F

Sushi

#8FAA42

Hippie Pink

#AA425B

Seagull

#80C9E6

Orient

#005972