#666CBB#666CBB

#666CBB is a mid, vivid blue. Relative luminance 0.171; OKLCH L 56.3% C 0.121 H 278.5°. Best body text is #FFFFFF at 4.74:1 contrast (WCAG AA passes).

Color values

HEX	#666CBB
RGB	rgb(102, 108, 187)
HSL	hsl(236, 38%, 57%)
HSV	hsv(236, 45%, 73%)
CMYK	cmyk(45.5%, 42.2%, 0%, 26.7%)
CIE-LAB	lab(48.43, 18.72, -42.45)
CIE-LCH	lch(48.43, 46.40, 293.80°)
OKLab	oklab(56.26% 0.0178 -0.12)
OKLCH	oklch(56.26% 0.121 278.5)
XYZ	xyz(19.8090, 17.1368, 49.2680)
Luminance	0.1714 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CBB #BBB566

analogous

#6697BB #666CBB #8B66BB

triadic

#666CBB #BB666C #6CBB66

tetradic

#666CBB #BB6697 #BBB566 #66BB8B

square

#666CBB #BB6697 #BBB566 #66BB8B

split-complementary

#666CBB #BB8B66 #97BB66

monochromatic

#333873 #464C9E #666CBB #9095CE #BBBDE1

Accessibility & contrast

On white

4.74

#666CBB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.43

#666CBB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CBB

4.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CBB	#FFFFFF	#000000	##FFFFFF
##666CBB	1.00	4.74	4.43	4.74
#FFFFFF	4.74	1.00	21.00	1.00
#000000	4.43	21.00	1.00	21.00
##FFFFFF	4.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E76BE

Deuteranopia (green-blind)

#4870B9

Tritanopia (blue-blind)

#497C8A

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666cbb;
/* rgb */ color: rgb(102, 108, 187);
/* oklch */ color: oklch(56.3% 0.121 278.5);

Tailwind

colors: {
  custom: {
    50: '#9696d0',
    500: '#666cbb',
    950: '#000000',
  },
}

SCSS

$custom: #666cbb;
$custom-light: #9696d0;
$custom-dark: #000000;

JSON

{
  "hex": "#666cbb",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 187
  },
  "hsl": {
    "h": 235.765,
    "s": 38.462,
    "l": 56.667
  },
  "oklch": {
    "l": 0.56258,
    "c": 0.12133,
    "h": 278.5
  },
  "luminance": 0.17138
}

Semantic roles & 50–950 ramp

primary

#666CBB

secondary

#D0CDAD

accent

#C659CE

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666CBB

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →