#66639D#66639D

#66639D is a mid, moderate blue. Relative luminance 0.142; OKLCH L 52.7% C 0.090 H 285.2°. Best body text is #FFFFFF at 5.47:1 contrast (WCAG AA passes).

Color values

HEX	#66639D
RGB	rgb(102, 99, 157)
HSL	hsl(243, 23%, 50%)
HSV	hsv(243, 37%, 62%)
CMYK	cmyk(35%, 36.9%, 0%, 38.4%)
CIE-LAB	lab(44.49, 15.48, -31.10)
CIE-LCH	lch(44.49, 34.74, 296.46°)
OKLab	oklab(52.74% 0.0237 -0.087)
OKLCH	oklch(52.74% 0.09 285.2)
XYZ	xyz(16.0255, 14.1823, 33.7849)
Luminance	0.1418 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66639D #9A9D63

analogous

#637D9D #66639D #83639D

triadic

#66639D #9D6663 #639D66

tetradic

#66639D #9D637D #9A9D63 #639D83

square

#66639D #9D637D #9A9D63 #639D83

split-complementary

#66639D #9D8363 #7D9D63

monochromatic

#353452 #4D4B78 #66639D #8B89B5 #B0AECC

Accessibility & contrast

On white

5.47

#66639D on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.84

#66639D on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #66639D

5.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66639D	#FFFFFF	#000000	##FFFFFF
##66639D	1.00	5.47	3.84	5.47
#FFFFFF	5.47	1.00	21.00	1.00
#000000	3.84	21.00	1.00	21.00
##FFFFFF	5.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#516B9F

Deuteranopia (green-blind)

#50689C

Tritanopia (blue-blind)

#586E78

Achromatopsia (no color)

#696969

Design tokens & code

CSS

--color: #66639d;
/* rgb */ color: rgb(102, 99, 157);
/* oklch */ color: oklch(52.7% 0.090 285.2);

Tailwind

colors: {
  custom: {
    50: '#938fba',
    500: '#66639d',
    950: '#000000',
  },
}

SCSS

$custom: #66639d;
$custom-light: #938fba;
$custom-dark: #000000;

JSON

{
  "hex": "#66639d",
  "rgb": {
    "r": 102,
    "g": 99,
    "b": 157
  },
  "hsl": {
    "h": 243.103,
    "s": 22.835,
    "l": 50.196
  },
  "oklch": {
    "l": 0.52744,
    "c": 0.09016,
    "h": 285.2
  },
  "luminance": 0.14183
}

Semantic roles & 50–950 ramp

primary

#66639D

secondary

#BABBA1

accent

#BF68BB

background

#F9F8FB

surface

#F1F0F6

border

#CBCBD0

text

#0D0C11

muted

#7E7D80

Preview Lab

Preview with #66639D

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

Preview Lab → · Contrast checker → · Palette generator →