#666CD8#666CD8

#666CD8 is a mid, vivid blue. Relative luminance 0.185; OKLCH L 58.1% C 0.162 H 277.7°. Best body text is #000000 at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#666CD8
RGB	rgb(102, 108, 216)
HSL	hsl(237, 59%, 62%)
HSV	hsv(237, 53%, 85%)
CMYK	cmyk(52.8%, 50%, 0%, 15.3%)
CIE-LAB	lab(50.10, 27.69, -56.39)
CIE-LCH	lch(50.10, 62.82, 296.15°)
OKLab	oklab(58.07% 0.0217 -0.1609)
OKLCH	oklch(58.07% 0.162 277.7)
XYZ	xyz(23.2328, 18.5063, 67.3003)
Luminance	0.1851 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CD8 #D8D266

analogous

#66A5D8 #666CD8 #9966D8

triadic

#666CD8 #D8666C #6CD866

tetradic

#666CD8 #D866A5 #D8D266 #66D899

square

#666CD8 #D866A5 #D8D266 #66D899

split-complementary

#666CD8 #D89966 #A5D866

monochromatic

#282E9C #353DCC #666CD8 #979BE4 #C8CAF1

Accessibility & contrast

On white

4.47

#666CD8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.70

#666CD8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CD8

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CD8	#FFFFFF	#000000	##000000
##666CD8	1.00	4.47	4.70	4.70
#FFFFFF	4.47	1.00	21.00	21.00
#000000	4.70	21.00	1.00	1.00
##000000	4.70	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#367CDC

Deuteranopia (green-blind)

#2873D6

Tritanopia (blue-blind)

#338498

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666cd8;
/* rgb */ color: rgb(102, 108, 216);
/* oklch */ color: oklch(58.1% 0.162 277.7);

Tailwind

colors: {
  custom: {
    50: '#9996e5',
    500: '#666cd8',
    950: '#000000',
  },
}

SCSS

$custom: #666cd8;
$custom-light: #9996e5;
$custom-dark: #000000;

JSON

{
  "hex": "#666cd8",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 216
  },
  "hsl": {
    "h": 236.842,
    "s": 59.375,
    "l": 62.353
  },
  "oklch": {
    "l": 0.58067,
    "c": 0.16235,
    "h": 277.7
  },
  "luminance": 0.18508
}

Semantic roles & 50–950 ramp

primary

#666CD8

secondary

#E2E0B8

accent

#BE1EC7

background

#F9F9FE

surface

#F2F1FC

border

#CCCBD5

text

#0F0D16

muted

#7E7E84

Preview Lab

Preview with #666CD8

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

Preview Lab → · Contrast checker → · Palette generator →