#666CB4#666CB4

#666CB4 is a mid, moderate blue. Relative luminance 0.168; OKLCH L 55.9% C 0.111 H 278.5°. Best body text is #FFFFFF at 4.81:1 contrast (WCAG AA passes).

Color values

HEX	#666CB4
RGB	rgb(102, 108, 180)
HSL	hsl(235, 34%, 55%)
HSV	hsv(235, 43%, 71%)
CMYK	cmyk(43.3%, 40%, 0%, 29.4%)
CIE-LAB	lab(48.06, 16.62, -38.98)
CIE-LCH	lch(48.06, 42.37, 293.09°)
OKLab	oklab(55.86% 0.0165 -0.1099)
OKLCH	oklch(55.86% 0.111 278.5)
XYZ	xyz(19.0778, 16.8443, 45.4172)
Luminance	0.1684 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CB4 #B4AE66

analogous

#6693B4 #666CB4 #8766B4

triadic

#666CB4 #B4666C #6CB466

tetradic

#666CB4 #B46693 #B4AE66 #66B487

square

#666CB4 #B46693 #B4AE66 #66B487

split-complementary

#666CB4 #B48766 #93B466

monochromatic

#34396B #494E94 #666CB4 #8F93C8 #B8BBDC

Accessibility & contrast

On white

4.81

#666CB4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.37

#666CB4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CB4

4.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CB4	#FFFFFF	#000000	##FFFFFF
##666CB4	1.00	4.81	4.37	4.81
#FFFFFF	4.81	1.00	21.00	1.00
#000000	4.37	21.00	1.00	21.00
##FFFFFF	4.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5275B7

Deuteranopia (green-blind)

#4D6FB2

Tritanopia (blue-blind)

#4D7B87

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666cb4;
/* rgb */ color: rgb(102, 108, 180);
/* oklch */ color: oklch(55.9% 0.111 278.5);

Tailwind

colors: {
  custom: {
    50: '#9596cb',
    500: '#666cb4',
    950: '#000000',
  },
}

SCSS

$custom: #666cb4;
$custom-light: #9596cb;
$custom-dark: #000000;

JSON

{
  "hex": "#666cb4",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 180
  },
  "hsl": {
    "h": 235.385,
    "s": 34.211,
    "l": 55.294
  },
  "oklch": {
    "l": 0.55856,
    "c": 0.1111,
    "h": 278.5
  },
  "luminance": 0.16845
}

Semantic roles & 50–950 ramp

primary

#666CB4

secondary

#CBC9AB

accent

#C25ECA

background

#F9F9FC

surface

#F2F1F8

border

#CCCBD1

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666CB4

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

Preview Lab → · Contrast checker → · Palette generator →