#666CBE#666CBE

#666CBE is a mid, vivid blue. Relative luminance 0.173; OKLCH L 56.4% C 0.126 H 278.4°. Best body text is #FFFFFF at 4.72:1 contrast (WCAG AA passes).

Color values

HEX	#666CBE
RGB	rgb(102, 108, 190)
HSL	hsl(236, 40%, 57%)
HSV	hsv(236, 46%, 75%)
CMYK	cmyk(46.3%, 43.2%, 0%, 25.5%)
CIE-LAB	lab(48.59, 19.63, -43.93)
CIE-LCH	lch(48.59, 48.12, 294.08°)
OKLab	oklab(56.44% 0.0184 -0.1243)
OKLCH	oklch(56.44% 0.126 278.4)
XYZ	xyz(20.1335, 17.2666, 50.9771)
Luminance	0.1727 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CBE #BEB866

analogous

#6698BE #666CBE #8C66BE

triadic

#666CBE #BE666C #6CBE66

tetradic

#666CBE #BE6698 #BEB866 #66BE8C

square

#666CBE #BE6698 #BEB866 #66BE8C

split-complementary

#666CBE #BE8C66 #98BE66

monochromatic

#333777 #454BA2 #666CBE #9195D0 #BCBFE2

Accessibility & contrast

On white

4.72

#666CBE on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.45

#666CBE on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CBE

4.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CBE	#FFFFFF	#000000	##FFFFFF
##666CBE	1.00	4.72	4.45	4.72
#FFFFFF	4.72	1.00	21.00	1.00
#000000	4.45	21.00	1.00	21.00
##FFFFFF	4.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4C77C1

Deuteranopia (green-blind)

#4670BC

Tritanopia (blue-blind)

#477D8C

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666cbe;
/* rgb */ color: rgb(102, 108, 190);
/* oklch */ color: oklch(56.4% 0.126 278.4);

Tailwind

colors: {
  custom: {
    50: '#9696d2',
    500: '#666cbe',
    950: '#000000',
  },
}

SCSS

$custom: #666cbe;
$custom-light: #9696d2;
$custom-dark: #000000;

JSON

{
  "hex": "#666cbe",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 190
  },
  "hsl": {
    "h": 235.909,
    "s": 40.367,
    "l": 57.255
  },
  "oklch": {
    "l": 0.56435,
    "c": 0.12568,
    "h": 278.4
  },
  "luminance": 0.17268
}

Semantic roles & 50–950 ramp

primary

#666CBE

secondary

#D2CFAE

accent

#C858D0

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666CBE

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

Preview Lab → · Contrast checker → · Palette generator →