#3f72bb

Steel Blue

Closest match (93% match)

Color formats

RGB

rgb(63, 114, 187)

Red, Green, Blue components

HSL

hsl(215, 50%, 49%)

Hue, Saturation, Lightness

CMYK

cmyk(66, 39, 0, 27)

Print color encoding

Luminance

0.167

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#3f72bb

#bb883f

Analogous (Adjacent)

#3fb0bb

#3f72bb

#4a3fbb

Triadic

#3f72bb

#bb3f72

#72bb3f

Split complementary

#3f72bb

#bb4a3f

#b0bb3f

Complete conversion table

HEX

#3F72BB

RGB

rgb(63,114,187)

RGBA

rgba(63,114,187, 1)

HSL

hsl(215.32,49.6%,49.02%)

OKLCH (Modern CSS)

oklch(0.55 0.13 257.5)

CSS Variable

--color: #3f72bb;

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

4.84

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

4.34

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#3f72bb#9293bb

ORIG

SIM

Deuteranopia (green)

#3f72bb#6c64bb

ORIG

SIM

Tritanopia (blue)

#3f72bb#42515a

ORIG

SIM

Monochrome (color blind)

#3f72bb#727272

Mixing guide

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

MIXING PALETTE

86%

10%

RYB PIGMENTS

Ultramarine blue

Pigment

86%

Cadmium yellow

Pigment

10%

Ivory black

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)

16.7%

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.

Sail On

#4575AD

Campanula

#3473B7

Matt Blue

#2C6FBB

Blue Triumph

#4376AB

Tussock

#BB883F

Governor Bay

#4A3FBB

Pelorous

#3FB0BB

Blush

#BB3F72

Sushi

#72BB3F

Crail

#BB4A3F

Malibu

#7FAAF8

Congress Blue

#003F81