#3987ac

Boston Blue

Closest match (96% match)

Color formats

RGB

rgb(57, 135, 172)

Red, Green, Blue components

HSL

hsl(199, 50%, 45%)

Hue, Saturation, Lightness

CMYK

cmyk(67, 22, 0, 33)

Print color encoding

Luminance

0.212

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#3987ac

#ac5e39

Analogous (Adjacent)

#39ac97

#3987ac

#394dac

Triadic

#3987ac

#ac3987

#87ac39

Split complementary

#3987ac

#ac394d

#ac9739

Complete conversion table

HEX

#3987AC

RGB

rgb(57,135,172)

RGBA

rgba(57,135,172, 1)

HSL

hsl(199.3,50.22%,44.9%)

OKLCH (Modern CSS)

oklch(0.59 0.09 232.1)

CSS Variable

--color: #3987ac;

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

4.01

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

5.24

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#3987ac#9798ac

ORIG

SIM

Deuteranopia (green)

#3987ac#635cac

ORIG

SIM

Tritanopia (blue)

#3987ac#3d5862

ORIG

SIM

Monochrome (color blind)

#3987ac#7f7f7f

Mixing guide

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

MIXING PALETTE

68%

18%

14%

RYB PIGMENTS

Ultramarine blue

Pigment

68%

Ivory black

Pigment

18%

Cadmium yellow

Pigment

14%

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)

21.2%

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.

Underwater Moonlight

#4488AA

Mermaid Dreams

#0088BB

Forget-Me-Not

#0087BD

Corfu Waters

#008AAD

Brown Rust

#AC5E39

Azure

#394DAC

Keppel

#39AC98

Royal Heath

#AC3987

Sushi

#87AC39

Night Shadz

#AC394D

Seagull

#79C1E8

Regal Blue

#005273