#666FA4#666FA4

#666FA4 is a mid, moderate blue. Relative luminance 0.169; OKLCH L 55.6% C 0.083 H 276.0°. Best body text is #FFFFFF at 4.80:1 contrast (WCAG AA passes).

Color values

HEX	#666FA4
RGB	rgb(102, 111, 164)
HSL	hsl(231, 25%, 52%)
HSV	hsv(231, 38%, 64%)
CMYK	cmyk(37.8%, 32.3%, 0%, 35.7%)
CIE-LAB	lab(48.10, 10.11, -29.59)
CIE-LCH	lch(48.10, 31.27, 288.86°)
OKLab	oklab(55.63% 0.0087 -0.0826)
OKLCH	oklch(55.63% 0.083 276)
XYZ	xyz(17.8628, 16.8733, 37.4304)
Luminance	0.1687 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FA4 #A49B66

analogous

#668EA4 #666FA4 #7C66A4

triadic

#666FA4 #A4666F #6FA466

tetradic

#666FA4 #A4668E #A49B66 #66A47C

square

#666FA4 #A4668E #A49B66 #66A47C

split-complementary

#666FA4 #A47C66 #8EA466

monochromatic

#363B5A #4C5480 #666FA4 #8C93BB #B3B7D2

Accessibility & contrast

On white

4.80

#666FA4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.37

#666FA4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666FA4

4.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FA4	#FFFFFF	#000000	##FFFFFF
##666FA4	1.00	4.80	4.37	4.80
#FFFFFF	4.80	1.00	21.00	1.00
#000000	4.37	21.00	1.00	21.00
##FFFFFF	4.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5E75A6

Deuteranopia (green-blind)

#5970A3

Tritanopia (blue-blind)

#547982

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666fa4;
/* rgb */ color: rgb(102, 111, 164);
/* oklch */ color: oklch(55.6% 0.083 276.0);

Tailwind

colors: {
  custom: {
    50: '#9498bf',
    500: '#666fa4',
    950: '#000000',
  },
}

SCSS

$custom: #666fa4;
$custom-light: #9498bf;
$custom-dark: #000000;

JSON

{
  "hex": "#666fa4",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 164
  },
  "hsl": {
    "h": 231.29,
    "s": 25.41,
    "l": 52.157
  },
  "oklch": {
    "l": 0.55629,
    "c": 0.08306,
    "h": 276
  },
  "luminance": 0.16874
}

Semantic roles & 50–950 ramp

primary

#666FA4

secondary

#C0BDA5

accent

#B466C2

background

#F9F9FB

surface

#F2F2F7

border

#CCCCD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666FA4

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

Preview Lab → · Contrast checker → · Palette generator →