#666EA3#666EA3

#666EA3 is a mid, moderate blue. Relative luminance 0.166; OKLCH L 55.4% C 0.083 H 276.8°. Best body text is #FFFFFF at 4.86:1 contrast (WCAG AA passes).

Color values

HEX	#666EA3
RGB	rgb(102, 110, 163)
HSL	hsl(232, 25%, 52%)
HSV	hsv(232, 37%, 64%)
CMYK	cmyk(37.4%, 32.5%, 0%, 36.1%)
CIE-LAB	lab(47.78, 10.43, -29.50)
CIE-LCH	lch(47.78, 31.29, 289.47°)
OKLab	oklab(55.36% 0.0098 -0.0824)
OKLCH	oklch(55.36% 0.083 276.8)
XYZ	xyz(17.6644, 16.6203, 36.9205)
Luminance	0.1662 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EA3 #A39B66

analogous

#668DA3 #666EA3 #7D66A3

triadic

#666EA3 #A3666E #6EA366

tetradic

#666EA3 #A3668D #A39B66 #66A37D

square

#666EA3 #A3668D #A39B66 #66A37D

split-complementary

#666EA3 #A37D66 #8DA366

monochromatic

#363A59 #4D537F #666EA3 #8C92BA #B2B6D1

Accessibility & contrast

On white

4.86

#666EA3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.32

#666EA3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666EA3

4.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EA3	#FFFFFF	#000000	##FFFFFF
##666EA3	1.00	4.86	4.32	4.86
#FFFFFF	4.86	1.00	21.00	1.00
#000000	4.32	21.00	1.00	21.00
##FFFFFF	4.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5D74A5

Deuteranopia (green-blind)

#596FA2

Tritanopia (blue-blind)

#547881

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #666ea3;
/* rgb */ color: rgb(102, 110, 163);
/* oklch */ color: oklch(55.4% 0.083 276.8);

Tailwind

colors: {
  custom: {
    50: '#9497be',
    500: '#666ea3',
    950: '#000000',
  },
}

SCSS

$custom: #666ea3;
$custom-light: #9497be;
$custom-dark: #000000;

JSON

{
  "hex": "#666ea3",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 163
  },
  "hsl": {
    "h": 232.131,
    "s": 24.898,
    "l": 51.961
  },
  "oklch": {
    "l": 0.55365,
    "c": 0.08295,
    "h": 276.8
  },
  "luminance": 0.16621
}

Semantic roles & 50–950 ramp

primary

#666EA3

secondary

#C0BCA5

accent

#B566C1

background

#F9F9FB

surface

#F1F2F7

border

#CBCCD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666EA3

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

Preview Lab → · Contrast checker → · Palette generator →