#256bb0

Cerulean Blue

Closest match (90% match)

Color formats

RGB

rgb(37, 107, 176)

Red, Green, Blue components

HSL

hsl(210, 65%, 42%)

Hue, Saturation, Lightness

CMYK

cmyk(79, 39, 0, 31)

Print color encoding

Luminance

0.140

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#256bb0

#b06a25

Analogous (Adjacent)

#25b0b0

#256bb0

#2525b0

Triadic

#256bb0

#b0256b

#6bb025

Split complementary

#256bb0

#b02525

#b0b025

Complete conversion table

HEX

#256BB0

RGB

rgb(37,107,176)

RGBA

rgba(37,107,176, 1)

HSL

hsl(209.78,65.26%,41.76%)

OKLCH (Modern CSS)

oklch(0.52 0.13 251.6)

CSS Variable

--color: #256bb0;

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

5.51

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

3.81

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#256bb0#898ab0

ORIG

SIM

Deuteranopia (green)

#256bb0#584fb0

ORIG

SIM

Tritanopia (blue)

#256bb0#29424a

ORIG

SIM

Monochrome (color blind)

#256bb0#696969

Mixing guide

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

MIXING PALETTE

67%

23%

10%

RYB PIGMENTS

Ultramarine blue

Pigment

67%

Ivory black

Pigment

23%

Cadmium yellow

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)

14.0%

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

Wing Commander

#0065AC

Campanula

#3473B7

Muted Blue

#3B719F

Desert

#B06A25

Governor Bay

#2525B0

Eastern Blue

#25B0B0

Hibiscus

#B0256B

Olive Drab

#6BB025

Mexican Red

#B02525

Cornflower Blue

#6CA2ED

Regal Blue

#003977