#3399bd

Boston Blue

Closest match (97% match)

Color formats

RGB

rgb(51, 153, 189)

Red, Green, Blue components

HSL

hsl(196, 58%, 47%)

Hue, Saturation, Lightness

CMYK

cmyk(73, 19, 0, 26)

Print color encoding

Luminance

0.272

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#3399bd

#bd5733

Analogous (Adjacent)

#33bd9c

#3399bd

#3354bd

Triadic

#3399bd

#bd3399

#99bd33

Split complementary

#3399bd

#bd3354

#bd9c33

Complete conversion table

HEX

#3399BD

RGB

rgb(51,153,189)

RGBA

rgba(51,153,189, 1)

HSL

hsl(195.65,57.5%,47.06%)

OKLCH (Modern CSS)

oklch(0.64 0.11 225.9)

CSS Variable

--color: #3399bd;

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

3.26

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

6.43

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#3399bd#a9a9bd

ORIG

SIM

Deuteranopia (green)

#3399bd#665cbd

ORIG

SIM

Tritanopia (blue)

#3399bd#385e69

ORIG

SIM

Monochrome (color blind)

#3399bd#8e8e8e

Mixing guide

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

MIXING PALETTE

74%

17%

10%

RYB PIGMENTS

Ultramarine blue

Pigment

74%

Cadmium yellow

Pigment

17%

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

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)

27.2%

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.

Ocean Blue

#009DC4

ReadyTools

#4BA2C2

Laguna

#36A5C9

Swimmer

#0A91BF

Tuscany

#BD5733

Cerulean Blue

#3354BD

Shamrock

#33BD9C

Medium Red Violet

#BD3399

Atlantis

#99BD33

Hibiscus

#BD3354

Malibu

#79D4FA

Orient

#006283