#666BB8#666BB8

#666BB8 is a mid, moderate blue. Relative luminance 0.168; OKLCH L 55.9% C 0.118 H 279.0°. Best body text is #FFFFFF at 4.82:1 contrast (WCAG AA passes).

Color values

HEX	#666BB8
RGB	rgb(102, 107, 184)
HSL	hsl(236, 37%, 56%)
HSV	hsv(236, 45%, 72%)
CMYK	cmyk(44.6%, 41.8%, 0%, 27.8%)
CIE-LAB	lab(48.01, 18.43, -41.39)
CIE-LCH	lch(48.01, 45.31, 294.00°)
OKLab	oklab(55.88% 0.0186 -0.1169)
OKLCH	oklch(55.88% 0.118 279)
XYZ	xyz(19.3863, 16.7999, 47.5593)
Luminance	0.1680 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BB8 #B8B366

analogous

#6694B8 #666BB8 #8A66B8

triadic

#666BB8 #B8666B #6BB866

tetradic

#666BB8 #B86694 #B8B366 #66B88A

square

#666BB8 #B86694 #B8B366 #66B88A

split-complementary

#666BB8 #B88A66 #94B866

monochromatic

#343870 #474C9A #666BB8 #9093CB #BABCDF

Accessibility & contrast

On white

4.82

#666BB8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.36

#666BB8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BB8

4.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BB8	#FFFFFF	#000000	##FFFFFF
##666BB8	1.00	4.82	4.36	4.82
#FFFFFF	4.82	1.00	21.00	1.00
#000000	4.36	21.00	1.00	21.00
##FFFFFF	4.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E75BB

Deuteranopia (green-blind)

#496FB6

Tritanopia (blue-blind)

#4B7B88

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666bb8;
/* rgb */ color: rgb(102, 107, 184);
/* oklch */ color: oklch(55.9% 0.118 279.0);

Tailwind

colors: {
  custom: {
    50: '#9695ce',
    500: '#666bb8',
    950: '#000000',
  },
}

SCSS

$custom: #666bb8;
$custom-light: #9695ce;
$custom-dark: #000000;

JSON

{
  "hex": "#666bb8",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 184
  },
  "hsl": {
    "h": 236.341,
    "s": 36.607,
    "l": 56.078
  },
  "oklch": {
    "l": 0.55882,
    "c": 0.11837,
    "h": 279
  },
  "luminance": 0.16801
}

Semantic roles & 50–950 ramp

primary

#666BB8

secondary

#CECCAC

accent

#C65BCD

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666BB8

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

Preview Lab → · Contrast checker → · Palette generator →