#666DC8#666DC8

#666DC8 is a mid, vivid blue. Relative luminance 0.179; OKLCH L 57.2% C 0.139 H 277.7°. Best body text is #000000 at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#666DC8
RGB	rgb(102, 109, 200)
HSL	hsl(236, 47%, 59%)
HSV	hsv(236, 49%, 78%)
CMYK	cmyk(49%, 45.5%, 0%, 21.6%)
CIE-LAB	lab(49.41, 22.09, -48.38)
CIE-LCH	lch(49.41, 53.18, 294.54°)
OKLab	oklab(57.24% 0.0187 -0.1374)
OKLCH	oklch(57.24% 0.139 277.7)
XYZ	xyz(21.3702, 17.9310, 56.9673)
Luminance	0.1793 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DC8 #C8C166

analogous

#669EC8 #666DC8 #9066C8

triadic

#666DC8 #C8666D #6DC866

tetradic

#666DC8 #C8669E #C8C166 #66C890

square

#666DC8 #C8669E #C8C166 #66C890

split-complementary

#666DC8 #C89066 #9EC866

monochromatic

#2F3684 #4048B1 #666DC8 #9398D8 #C0C3E8

Accessibility & contrast

On white

4.58

#666DC8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.59

#666DC8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666DC8

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DC8	#FFFFFF	#000000	##000000
##666DC8	1.00	4.58	4.59	4.59
#FFFFFF	4.58	1.00	21.00	21.00
#000000	4.59	21.00	1.00	1.00
##000000	4.59	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4779CB

Deuteranopia (green-blind)

#3E72C6

Tritanopia (blue-blind)

#408091

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #666dc8;
/* rgb */ color: rgb(102, 109, 200);
/* oklch */ color: oklch(57.2% 0.139 277.7);

Tailwind

colors: {
  custom: {
    50: '#9796d9',
    500: '#666dc8',
    950: '#000000',
  },
}

SCSS

$custom: #666dc8;
$custom-light: #9796d9;
$custom-dark: #000000;

JSON

{
  "hex": "#666dc8",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 200
  },
  "hsl": {
    "h": 235.714,
    "s": 47.115,
    "l": 59.216
  },
  "oklch": {
    "l": 0.57238,
    "c": 0.13863,
    "h": 277.7
  },
  "luminance": 0.17932
}

Semantic roles & 50–950 ramp

primary

#666DC8

secondary

#D8D5B2

accent

#CD51D7

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666DC8

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

Preview Lab → · Contrast checker → · Palette generator →