#3387bb

Boston Blue

Closest match (94% match)

Color formats

RGB

rgb(51, 135, 187)

Red, Green, Blue components

HSL

hsl(203, 57%, 47%)

Hue, Saturation, Lightness

CMYK

cmyk(73, 28, 0, 27)

Print color encoding

Luminance

0.216

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#3387bb

#bb6733

Analogous (Adjacent)

#33bbab

#3387bb

#3343bb

Triadic

#3387bb

#bb3387

#87bb33

Split complementary

#3387bb

#bb3343

#bbab33

Complete conversion table

HEX

#3387BB

RGB

rgb(51,135,187)

RGBA

rgba(51,135,187, 1)

HSL

hsl(202.94,57.14%,46.67%)

OKLCH (Modern CSS)

oklch(0.60 0.11 239.9)

CSS Variable

--color: #3387bb;

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

3.94

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

5.32

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#3387bb#9e9ebb

ORIG

SIM

Deuteranopia (green)

#3387bb#655cbb

ORIG

SIM

Tritanopia (blue)

#3387bb#375560

ORIG

SIM

Monochrome (color blind)

#3387bb#808080

Mixing guide

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

MIXING PALETTE

75%

14%

11%

RYB PIGMENTS

Ultramarine blue

Pigment

75%

Cadmium yellow

Pigment

14%

Ivory black

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)

21.6%

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.

King Triton

#3C85BE

Warm Spring

#4286BC

Way Beyond the Blue

#1188CC

Forget-Me-Not

#0087BD

Copper

#BB6733

Governor Bay

#3343BB

Puerto Rico

#33BBAB

Medium Red Violet

#BB3387

Sushi

#87BB33

Well Read

#BB3343

Malibu

#77C0F8

Orient

#005281