#3370bc

Cerulean Blue

Closest match (89% match)

Color formats

RGB

rgb(51, 112, 188)

Red, Green, Blue components

HSL

hsl(213, 57%, 47%)

Hue, Saturation, Lightness

CMYK

cmyk(73, 40, 0, 26)

Print color encoding

Luminance

0.159

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#3370bc

#bc7f33

Analogous (Adjacent)

#33b5bc

#3370bc

#3a33bc

Triadic

#3370bc

#bc3370

#70bc33

Split complementary

#3370bc

#bc3a33

#b5bc33

Complete conversion table

HEX

#3370BC

RGB

rgb(51,112,188)

RGBA

rgba(51,112,188, 1)

HSL

hsl(213.28,57.32%,46.86%)

OKLCH (Modern CSS)

oklch(0.54 0.13 255.4)

CSS Variable

--color: #3370bc;

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

5.02

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

4.18

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#3370bc#9192bc

ORIG

SIM

Deuteranopia (green)

#3370bc#655cbc

ORIG

SIM

Tritanopia (blue)

#3370bc#364b53

ORIG

SIM

Monochrome (color blind)

#3370bc#6f6f6f

Mixing guide

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

MIXING PALETTE

80%

10%

RYB PIGMENTS

Ultramarine blue

Pigment

80%

Cadmium yellow

Pigment

10%

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)

15.9%

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.

Matt Blue

#2C6FBB

Campanula

#3473B7

Sail On

#4575AD

Blue Triumph

#4376AB

Copper

#BC7F33

Governor Bay

#3A33BC

Pelorous

#33B5BC

Hibiscus

#BC3370

Sushi

#70BC33

Well Read

#BC3A33

Malibu

#77A8F9

Congress Blue

#003D82