#0033b5

International Klein Blue

Closest match (98% match)

Color formats

RGB

rgb(0, 51, 181)

Red, Green, Blue components

HSL

hsl(223, 100%, 35%)

Hue, Saturation, Lightness

CMYK

cmyk(100, 72, 0, 29)

Print color encoding

Luminance

0.057

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#0033b5

#b58200

Analogous (Adjacent)

#008db5

#0033b5

#2800b5

Triadic

#0033b5

#b50033

#33b500

Split complementary

#0033b5

#b52800

#8eb500

Complete conversion table

HEX

#0033B5

RGB

rgb(0,51,181)

RGBA

rgba(0,51,181, 1)

HSL

hsl(223.09,100%,35.49%)

OKLCH (Modern CSS)

oklch(0.40 0.21 263.3)

CSS Variable

--color: #0033b5;

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

9.81

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

2.14

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#0033b5#6c6eb5

ORIG

SIM

Deuteranopia (green)

#0033b5#4336b5

ORIG

SIM

Tritanopia (blue)

#0033b5#03181b

ORIG

SIM

Monochrome (color blind)

#0033b5#443e69

Mixing guide

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

MIXING PALETTE

66%

29%

RYB PIGMENTS

Ultramarine blue

Pigment

66%

Ivory black

Pigment

29%

Cadmium yellow

Pigment

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)

5.7%

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.

Blue Screen of Death

#0033BB

Blue Hour

#0034AB

International Klein Blue

#002FA6

Sapphire Glitter

#0033CC

Pirate Gold

#B58200

Dark Blue

#2800B5

Bondi Blue

#008DB5

Monza

#B50033

Limeade

#33B500

Milano Red

#B52800

Cornflower Blue

#6566F3

Navy Blue

#00087A