#666CD0#666CD0

#666CD0 is a mid, vivid blue. Relative luminance 0.181; OKLCH L 57.5% C 0.151 H 277.9°. Best body text is #000000 at 4.62:1 contrast (WCAG AA passes).

Color values

HEX	#666CD0
RGB	rgb(102, 108, 208)
HSL	hsl(237, 53%, 61%)
HSV	hsv(237, 51%, 82%)
CMYK	cmyk(51%, 48.1%, 0%, 18.4%)
CIE-LAB	lab(49.62, 25.19, -52.62)
CIE-LCH	lch(49.62, 58.34, 295.58°)
OKLab	oklab(57.55% 0.0209 -0.1498)
OKLCH	oklch(57.55% 0.151 277.9)
XYZ	xyz(22.2237, 18.1026, 61.9854)
Luminance	0.1810 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CD0 #D0CA66

analogous

#66A1D0 #666CD0 #9566D0

triadic

#666CD0 #D0666C #6CD066

tetradic

#666CD0 #D066A1 #D0CA66 #66D095

square

#666CD0 #D066A1 #D0CA66 #66D095

split-complementary

#666CD0 #D09566 #A1D066

monochromatic

#2C3290 #3A42BE #666CD0 #9599DE #C4C6ED

Accessibility & contrast

On white

4.54

#666CD0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.62

#666CD0 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CD0

4.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CD0	#FFFFFF	#000000	##000000
##666CD0	1.00	4.54	4.62	4.62
#FFFFFF	4.54	1.00	21.00	21.00
#000000	4.62	21.00	1.00	1.00
##000000	4.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#3E7AD4

Deuteranopia (green-blind)

#3472CE

Tritanopia (blue-blind)

#3A8294

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #666cd0;
/* rgb */ color: rgb(102, 108, 208);
/* oklch */ color: oklch(57.5% 0.151 277.9);

Tailwind

colors: {
  custom: {
    50: '#9896df',
    500: '#666cd0',
    950: '#000000',
  },
}

SCSS

$custom: #666cd0;
$custom-light: #9896df;
$custom-dark: #000000;

JSON

{
  "hex": "#666cd0",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 208
  },
  "hsl": {
    "h": 236.604,
    "s": 53,
    "l": 60.784
  },
  "oklch": {
    "l": 0.57546,
    "c": 0.15126,
    "h": 277.9
  },
  "luminance": 0.18104
}

Semantic roles & 50–950 ramp

primary

#666CD0

secondary

#DDDBB5

accent

#B825C0

background

#F9F9FD

surface

#F2F1FB

border

#CCCBD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666CD0

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

Preview Lab → · Contrast checker → · Palette generator →