#666CC0#666CC0

#666CC0 is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.6% C 0.129 H 278.4°. Best body text is #FFFFFF at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#666CC0
RGB	rgb(102, 108, 192)
HSL	hsl(236, 42%, 58%)
HSV	hsv(236, 47%, 75%)
CMYK	cmyk(46.9%, 43.7%, 0%, 24.7%)
CIE-LAB	lab(48.70, 20.24, -44.91)
CIE-LCH	lch(48.70, 49.26, 294.26°)
OKLab	oklab(56.55% 0.0187 -0.1272)
OKLCH	oklch(56.55% 0.129 278.4)
XYZ	xyz(20.3536, 17.3546, 52.1363)
Luminance	0.1736 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CC0 #C0BA66

analogous

#6699C0 #666CC0 #8D66C0

triadic

#666CC0 #C0666C #6CC066

tetradic

#666CC0 #C06699 #C0BA66 #66C08D

square

#666CC0 #C06699 #C0BA66 #66C08D

split-complementary

#666CC0 #C08D66 #99C066

monochromatic

#32377A #444AA5 #666CC0 #9196D2 #BDBFE4

Accessibility & contrast

On white

4.70

#666CC0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.47

#666CC0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CC0

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CC0	#FFFFFF	#000000	##FFFFFF
##666CC0	1.00	4.70	4.47	4.70
#FFFFFF	4.70	1.00	21.00	1.00
#000000	4.47	21.00	1.00	21.00
##FFFFFF	4.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B77C3

Deuteranopia (green-blind)

#4470BE

Tritanopia (blue-blind)

#467E8D

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666cc0;
/* rgb */ color: rgb(102, 108, 192);
/* oklch */ color: oklch(56.6% 0.129 278.4);

Tailwind

colors: {
  custom: {
    50: '#9796d3',
    500: '#666cc0',
    950: '#000000',
  },
}

SCSS

$custom: #666cc0;
$custom-light: #9796d3;
$custom-dark: #000000;

JSON

{
  "hex": "#666cc0",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 192
  },
  "hsl": {
    "h": 236,
    "s": 41.667,
    "l": 57.647
  },
  "oklch": {
    "l": 0.56554,
    "c": 0.12856,
    "h": 278.4
  },
  "luminance": 0.17356
}

Semantic roles & 50–950 ramp

primary

#666CC0

secondary

#D3D1AF

accent

#C956D1

background

#F9F9FD

surface

#F2F1FA

border

#CCCBD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666CC0

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

Preview Lab → · Contrast checker → · Palette generator →