#666CB7#666CB7

#666CB7 is a mid, moderate blue. Relative luminance 0.170; OKLCH L 56.0% C 0.116 H 278.5°. Best body text is #FFFFFF at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#666CB7
RGB	rgb(102, 108, 183)
HSL	hsl(236, 36%, 56%)
HSV	hsv(236, 44%, 72%)
CMYK	cmyk(44.3%, 41%, 0%, 28.2%)
CIE-LAB	lab(48.22, 17.52, -40.47)
CIE-LCH	lch(48.22, 44.10, 293.40°)
OKLab	oklab(56.03% 0.0171 -0.1142)
OKLCH	oklch(56.03% 0.116 278.5)
XYZ	xyz(19.3867, 16.9679, 47.0442)
Luminance	0.1697 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CB7 #B7B166

analogous

#6694B7 #666CB7 #8866B7

triadic

#666CB7 #B7666C #6CB766

tetradic

#666CB7 #B76694 #B7B166 #66B788

square

#666CB7 #B76694 #B7B166 #66B788

split-complementary

#666CB7 #B78866 #94B766

monochromatic

#34386F #484E98 #666CB7 #9094CB #B9BCDE

Accessibility & contrast

On white

4.78

#666CB7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.39

#666CB7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CB7

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CB7	#FFFFFF	#000000	##FFFFFF
##666CB7	1.00	4.78	4.39	4.78
#FFFFFF	4.78	1.00	21.00	1.00
#000000	4.39	21.00	1.00	21.00
##FFFFFF	4.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5076BA

Deuteranopia (green-blind)

#4B70B5

Tritanopia (blue-blind)

#4B7B89

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666cb7;
/* rgb */ color: rgb(102, 108, 183);
/* oklch */ color: oklch(56.0% 0.116 278.5);

Tailwind

colors: {
  custom: {
    50: '#9696cd',
    500: '#666cb7',
    950: '#000000',
  },
}

SCSS

$custom: #666cb7;
$custom-light: #9696cd;
$custom-dark: #000000;

JSON

{
  "hex": "#666cb7",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 183
  },
  "hsl": {
    "h": 235.556,
    "s": 36,
    "l": 55.882
  },
  "oklch": {
    "l": 0.56027,
    "c": 0.1155,
    "h": 278.5
  },
  "luminance": 0.16969
}

Semantic roles & 50–950 ramp

primary

#666CB7

secondary

#CDCBAC

accent

#C45CCC

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666CB7

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

Preview Lab → · Contrast checker → · Palette generator →