#669dd3

Danube

Closest match (97% match)

Color formats

RGB

rgb(102, 157, 211)

Red, Green, Blue components

HSL

hsl(210, 55%, 61%)

Hue, Saturation, Lightness

CMYK

cmyk(52, 26, 0, 17)

Print color encoding

Luminance

0.316

Relative luminance

Variations

Shades (Darkening)

Tints (Lightening)

Tones (Reduced saturation)

Harmonies

Click the color slices to copy the code.

Complementary (Opposite)

#669dd3

#d39c66

Analogous (Adjacent)

#66d3d3

#669dd3

#6666d3

Triadic

#669dd3

#d3669d

#9dd366

Split complementary

#669dd3

#d36666

#d3d366

Complete conversion table

HEX

#669DD3

RGB

rgb(102,157,211)

RGBA

rgba(102,157,211, 1)

HSL

hsl(209.72,55.33%,61.37%)

OKLCH (Modern CSS)

oklch(0.68 0.10 249.0)

CSS Variable

--color: #669dd3;

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

2.87

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

On black background

7.33

Small text (14pt)

The quick brown fox jumps over...

AAA

Large text or UI (18pt Bold)

AAA

Color blindness simulator

ORIG

SIM

Protanopia (red)

#669dd3#b5b5d3

ORIG

SIM

Deuteranopia (green)

#669dd3#8d87d3

ORIG

SIM

Tritanopia (blue)

#669dd3#697683

ORIG

SIM

Monochrome (color blind)

#669dd3#999999

Mixing guide

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

MIXING PALETTE

57%

35%

RYB PIGMENTS

Ultramarine blue

Pigment

57%

Titanium white

Pigment

35%

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)

31.6%

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 Bay

#619AD6

Winter Lakes

#5C97CF

Windstorm

#6D98C4

Windjammer

#62A5DF

Whiskey

#D39C66

Moody Blue

#6666D3

Downy

#66D3D3

Hopbush

#D3669D

Feijoa

#9DD366

Chestnut Rose

#D36666

Anakiwa

#A3D8FF

Jelly Bean

#246698