#397fbe

Boston Blue

Closest match (90% match)

Color formats

RGB

rgb(57, 127, 190)

Red, Green, Blue components

HSL

hsl(208, 54%, 48%)

Hue, Saturation, Lightness

CMYK

cmyk(70, 33, 0, 25)

Print color encoding

Luminance

0.198

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#397fbe

#be7839

Analogous (Adjacent)

#39bebb

#397fbe

#393cbe

Triadic

#397fbe

#be397f

#7fbe39

Split complementary

#397fbe

#be393d

#beba39

Complete conversion table

HEX

#397FBE

RGB

rgb(57,127,190)

RGBA

rgba(57,127,190, 1)

HSL

hsl(208.42,53.85%,48.43%)

OKLCH (Modern CSS)

oklch(0.58 0.12 248.5)

CSS Variable

--color: #397fbe;

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

4.24

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

4.95

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#397fbe#9b9bbe

ORIG

SIM

Deuteranopia (green)

#397fbe#6a61be

ORIG

SIM

Tritanopia (blue)

#397fbe#3d545e

ORIG

SIM

Monochrome (color blind)

#397fbe#7b7b7b

Mixing guide

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

MIXING PALETTE

82%

12%

RYB PIGMENTS

Ultramarine blue

Pigment

82%

Cadmium yellow

Pigment

12%

Ivory black

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)

19.8%

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

King Triton

#3C85BE

Soothing Sapphire

#307DD3

Copper

#BE7839

Governor Bay

#393CBE

Puerto Rico

#39BEBB

Medium Red Violet

#BE397F

Sushi

#7FBE39

Mojo

#BE393D

Malibu

#7CB8FB

Congress Blue

#004B84