#666CDC#666CDC

#666CDC is a mid, vivid blue. Relative luminance 0.187; OKLCH L 58.3% C 0.168 H 277.5°. Best body text is #000000 at 4.74:1 contrast (WCAG AA passes).

Color values

HEX	#666CDC
RGB	rgb(102, 108, 220)
HSL	hsl(237, 63%, 63%)
HSV	hsv(237, 54%, 86%)
CMYK	cmyk(53.6%, 50.9%, 0%, 13.7%)
CIE-LAB	lab(50.35, 28.95, -58.26)
CIE-LCH	lch(50.35, 65.06, 296.43°)
OKLab	oklab(58.33% 0.022 -0.1664)
OKLCH	oklch(58.33% 0.168 277.5)
XYZ	xyz(23.7562, 18.7157, 70.0569)
Luminance	0.1872 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CDC #DCD666

analogous

#66A7DC #666CDC #9B66DC

triadic

#666CDC #DC666C #6CDC66

tetradic

#666CDC #DC66A7 #DCD666 #66DC9B

square

#666CDC #DC66A7 #DCD666 #66DC9B

split-complementary

#666CDC #DC9B66 #A7DC66

monochromatic

#252CA2 #343CD1 #666CDC #989CE7 #CACCF3

Accessibility & contrast

On white

4.43

#666CDC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.74

#666CDC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666CDC

4.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CDC	#FFFFFF	#000000	##000000
##666CDC	1.00	4.43	4.74	4.74
#FFFFFF	4.43	1.00	21.00	21.00
#000000	4.74	21.00	1.00	1.00
##000000	4.74	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#327DE0

Deuteranopia (green-blind)

#2073DA

Tritanopia (blue-blind)

#2E859A

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666cdc;
/* rgb */ color: rgb(102, 108, 220);
/* oklch */ color: oklch(58.3% 0.168 277.5);

Tailwind

colors: {
  custom: {
    50: '#9a96e7',
    500: '#666cdc',
    950: '#000000',
  },
}

SCSS

$custom: #666cdc;
$custom-light: #9a96e7;
$custom-dark: #000000;

JSON

{
  "hex": "#666cdc",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 220
  },
  "hsl": {
    "h": 236.949,
    "s": 62.766,
    "l": 63.137
  },
  "oklch": {
    "l": 0.58334,
    "c": 0.16784,
    "h": 277.5
  },
  "luminance": 0.18717
}

Semantic roles & 50–950 ramp

primary

#666CDC

secondary

#E4E2BA

accent

#C21BCB

background

#FAF9FE

surface

#F3F1FD

border

#CDCBD5

text

#0F0D16

muted

#7F7E84

Preview Lab

Preview with #666CDC

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

Preview Lab → · Contrast checker → · Palette generator →