#666CB1#666CB1

#666CB1 is a mid, moderate blue. Relative luminance 0.167; OKLCH L 55.7% C 0.107 H 278.6°. Best body text is #FFFFFF at 4.83:1 contrast (WCAG AA passes).

Color values

HEX	#666CB1
RGB	rgb(102, 108, 177)
HSL	hsl(235, 32%, 55%)
HSV	hsv(235, 42%, 69%)
CMYK	cmyk(42.4%, 39%, 0%, 30.6%)
CIE-LAB	lab(47.91, 15.73, -37.48)
CIE-LCH	lch(47.91, 40.64, 292.76°)
OKLab	oklab(55.69% 0.0159 -0.1055)
OKLCH	oklch(55.69% 0.107 278.6)
XYZ	xyz(18.7755, 16.7234, 43.8251)
Luminance	0.1672 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CB1 #B1AB66

analogous

#6692B1 #666CB1 #8666B1

triadic

#666CB1 #B1666C #6CB166

tetradic

#666CB1 #B16692 #B1AB66 #66B186

square

#666CB1 #B16692 #B1AB66 #66B186

split-complementary

#666CB1 #B18666 #92B166

monochromatic

#353968 #4A4F90 #666CB1 #8F93C6 #B7BADA

Accessibility & contrast

On white

4.83

#666CB1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.34

#666CB1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CB1

4.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CB1	#FFFFFF	#000000	##FFFFFF
##666CB1	1.00	4.83	4.34	4.83
#FFFFFF	4.83	1.00	21.00	1.00
#000000	4.34	21.00	1.00	21.00
##FFFFFF	4.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5475B4

Deuteranopia (green-blind)

#4F6FAF

Tritanopia (blue-blind)

#4E7A86

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666cb1;
/* rgb */ color: rgb(102, 108, 177);
/* oklch */ color: oklch(55.7% 0.107 278.6);

Tailwind

colors: {
  custom: {
    50: '#9596c8',
    500: '#666cb1',
    950: '#000000',
  },
}

SCSS

$custom: #666cb1;
$custom-light: #9596c8;
$custom-dark: #000000;

JSON

{
  "hex": "#666cb1",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 177
  },
  "hsl": {
    "h": 235.2,
    "s": 32.468,
    "l": 54.706
  },
  "oklch": {
    "l": 0.55688,
    "c": 0.10668,
    "h": 278.6
  },
  "luminance": 0.16724
}

Semantic roles & 50–950 ramp

primary

#666CB1

secondary

#C9C7AA

accent

#C05FC9

background

#F9F9FC

surface

#F2F1F8

border

#CCCBD1

text

#0D0D13

muted

#7E7E82

Preview Lab

Preview with #666CB1

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

Preview Lab → · Contrast checker → · Palette generator →