#397cb8

Boston Blue

Closest match (89% match)

Color formats

RGB

rgb(57, 124, 184)

Red, Green, Blue components

HSL

hsl(208, 53%, 47%)

Hue, Saturation, Lightness

CMYK

cmyk(69, 33, 0, 28)

Print color encoding

Luminance

0.187

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#397cb8

#b87539

Analogous (Adjacent)

#39b8b5

#397cb8

#393cb8

Triadic

#397cb8

#b8397c

#7cb839

Split complementary

#397cb8

#b8393c

#b8b439

Complete conversion table

HEX

#397CB8

RGB

rgb(57,124,184)

RGBA

rgba(57,124,184, 1)

HSL

hsl(208.35,52.7%,47.25%)

OKLCH (Modern CSS)

oklch(0.57 0.12 248.3)

CSS Variable

--color: #397cb8;

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

4.42

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

4.75

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#397cb8#9697b8

ORIG

SIM

Deuteranopia (green)

#397cb8#675fb8

ORIG

SIM

Tritanopia (blue)

#397cb8#3c535d

ORIG

SIM

Monochrome (color blind)

#397cb8#787878

Mixing guide

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

MIXING PALETTE

78%

12%

10%

RYB PIGMENTS

Ultramarine blue

Pigment

78%

Cadmium yellow

Pigment

12%

Ivory black

Pigment

10%

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)

18.7%

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.

Mykonos

#387ABE

Haddock’s Sweater

#277ABA

Star of Life

#057BC1

Blue Triumph

#4376AB

Copper

#B87539

Governor Bay

#393CB8

Puerto Rico

#39B8B5

Medium Red Violet

#B8397C

Sushi

#7CB839

Medium Carmine

#B8393C

Malibu

#7AB5F5

Congress Blue

#00487E