#666CBF#666CBF

#666CBF is a mid, vivid blue. Relative luminance 0.173; OKLCH L 56.5% C 0.127 H 278.4°. Best body text is #FFFFFF at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#666CBF
RGB	rgb(102, 108, 191)
HSL	hsl(236, 41%, 57%)
HSV	hsv(236, 47%, 75%)
CMYK	cmyk(46.6%, 43.5%, 0%, 25.1%)
CIE-LAB	lab(48.65, 19.94, -44.42)
CIE-LCH	lch(48.65, 48.69, 294.17°)
OKLab	oklab(56.49% 0.0185 -0.1258)
OKLCH	oklch(56.49% 0.127 278.4)
XYZ	xyz(20.2432, 17.3104, 51.5547)
Luminance	0.1731 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CBF #BFB966

analogous

#6699BF #666CBF #8C66BF

triadic

#666CBF #BF666C #6CBF66

tetradic

#666CBF #BF6699 #BFB966 #66BF8C

square

#666CBF #BF6699 #BFB966 #66BF8C

split-complementary

#666CBF #BF8C66 #99BF66

monochromatic

#323778 #444BA3 #666CBF #9195D1 #BCBFE3

Accessibility & contrast

On white

4.71

#666CBF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.46

#666CBF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CBF

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CBF	#FFFFFF	#000000	##FFFFFF
##666CBF	1.00	4.71	4.46	4.71
#FFFFFF	4.71	1.00	21.00	1.00
#000000	4.46	21.00	1.00	21.00
##FFFFFF	4.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C77C2

Deuteranopia (green-blind)

#4570BD

Tritanopia (blue-blind)

#477D8C

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666cbf;
/* rgb */ color: rgb(102, 108, 191);
/* oklch */ color: oklch(56.5% 0.127 278.4);

Tailwind

colors: {
  custom: {
    50: '#9696d3',
    500: '#666cbf',
    950: '#000000',
  },
}

SCSS

$custom: #666cbf;
$custom-light: #9696d3;
$custom-dark: #000000;

JSON

{
  "hex": "#666cbf",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 191
  },
  "hsl": {
    "h": 235.955,
    "s": 41.014,
    "l": 57.451
  },
  "oklch": {
    "l": 0.56494,
    "c": 0.12712,
    "h": 278.4
  },
  "luminance": 0.17311
}

Semantic roles & 50–950 ramp

primary

#666CBF

secondary

#D2D0AE

accent

#C957D1

background

#F9F9FD

surface

#F2F1FA

border

#CCCBD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666CBF

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

Preview Lab → · Contrast checker → · Palette generator →