#666BBF#666BBF

#666BBF is a mid, vivid blue. Relative luminance 0.171; OKLCH L 56.3% C 0.129 H 278.8°. Best body text is #FFFFFF at 4.75:1 contrast (WCAG AA passes).

Color values

HEX	#666BBF
RGB	rgb(102, 107, 191)
HSL	hsl(237, 41%, 57%)
HSV	hsv(237, 47%, 75%)
CMYK	cmyk(46.6%, 44%, 0%, 25.1%)
CIE-LAB	lab(48.39, 20.55, -44.84)
CIE-LCH	lch(48.39, 49.32, 294.62°)
OKLab	oklab(56.29% 0.0198 -0.127)
OKLCH	oklch(56.29% 0.129 278.8)
XYZ	xyz(20.1383, 17.1007, 51.5198)
Luminance	0.1710 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BBF #BFBA66

analogous

#6698BF #666BBF #8D66BF

triadic

#666BBF #BF666B #6BBF66

tetradic

#666BBF #BF6698 #BFBA66 #66BF8D

square

#666BBF #BF6698 #BFBA66 #66BF8D

split-complementary

#666BBF #BF8D66 #98BF66

monochromatic

#323678 #444AA3 #666BBF #9195D1 #BCBEE3

Accessibility & contrast

On white

4.75

#666BBF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.42

#666BBF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BBF

4.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BBF	#FFFFFF	#000000	##FFFFFF
##666BBF	1.00	4.75	4.42	4.75
#FFFFFF	4.75	1.00	21.00	1.00
#000000	4.42	21.00	1.00	21.00
##FFFFFF	4.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4A76C2

Deuteranopia (green-blind)

#4370BD

Tritanopia (blue-blind)

#477D8C

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666bbf;
/* rgb */ color: rgb(102, 107, 191);
/* oklch */ color: oklch(56.3% 0.129 278.8);

Tailwind

colors: {
  custom: {
    50: '#9695d3',
    500: '#666bbf',
    950: '#000000',
  },
}

SCSS

$custom: #666bbf;
$custom-light: #9695d3;
$custom-dark: #000000;

JSON

{
  "hex": "#666bbf",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 191
  },
  "hsl": {
    "h": 236.629,
    "s": 41.014,
    "l": 57.451
  },
  "oklch": {
    "l": 0.56295,
    "c": 0.12852,
    "h": 278.8
  },
  "luminance": 0.17102
}

Semantic roles & 50–950 ramp

primary

#666BBF

secondary

#D2D0AE

accent

#CA57D1

background

#F9F9FD

surface

#F2F1FA

border

#CCCBD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666BBF

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

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