#66639B#66639B

#66639B is a mid, moderate blue. Relative luminance 0.141; OKLCH L 52.6% C 0.087 H 285.4°. Best body text is #FFFFFF at 5.49:1 contrast (WCAG AA passes).

Color values

HEX	#66639B
RGB	rgb(102, 99, 155)
HSL	hsl(243, 22%, 50%)
HSV	hsv(243, 36%, 61%)
CMYK	cmyk(34.2%, 36.1%, 0%, 39.2%)
CIE-LAB	lab(44.40, 14.92, -30.07)
CIE-LCH	lch(44.40, 33.56, 296.39°)
OKLab	oklab(52.64% 0.0232 -0.084)
OKLCH	oklch(52.64% 0.087 285.4)
XYZ	xyz(15.8561, 14.1146, 32.8930)
Luminance	0.1411 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#66639B #989B63

analogous

#637C9B #66639B #82639B

triadic

#66639B #9B6663 #639B66

tetradic

#66639B #9B637C #989B63 #639B82

square

#66639B #9B637C #989B63 #639B82

split-complementary

#66639B #9B8263 #7C9B63

monochromatic

#353350 #4D4B76 #66639B #8A88B3 #AFADCB

Accessibility & contrast

On white

5.49

#66639B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.82

#66639B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #66639B

5.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##66639B	#FFFFFF	#000000	##FFFFFF
##66639B	1.00	5.49	3.82	5.49
#FFFFFF	5.49	1.00	21.00	1.00
#000000	3.82	21.00	1.00	21.00
##FFFFFF	5.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#526B9D

Deuteranopia (green-blind)

#51679A

Tritanopia (blue-blind)

#586D78

Achromatopsia (no color)

#696969

Design tokens & code

CSS

--color: #66639b;
/* rgb */ color: rgb(102, 99, 155);
/* oklch */ color: oklch(52.6% 0.087 285.4);

Tailwind

colors: {
  custom: {
    50: '#938fb8',
    500: '#66639b',
    950: '#000000',
  },
}

SCSS

$custom: #66639b;
$custom-light: #938fb8;
$custom-dark: #000000;

JSON

{
  "hex": "#66639b",
  "rgb": {
    "r": 102,
    "g": 99,
    "b": 155
  },
  "hsl": {
    "h": 243.214,
    "s": 22.047,
    "l": 49.804
  },
  "oklch": {
    "l": 0.52639,
    "c": 0.08713,
    "h": 285.4
  },
  "luminance": 0.14115
}

Semantic roles & 50–950 ramp

primary

#66639B

secondary

#B8BAA0

accent

#BF69BA

background

#F9F8FB

surface

#F1F0F6

border

#CBCBD0

text

#0D0C11

muted

#7E7D80

Preview Lab

Preview with #66639B

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

Preview Lab → · Contrast checker → · Palette generator →