#666CA8#666CA8

#666CA8 is a mid, moderate blue. Relative luminance 0.164; OKLCH L 55.2% C 0.093 H 278.5°. Best body text is #FFFFFF at 4.91:1 contrast (WCAG AA passes).

Color values

HEX	#666CA8
RGB	rgb(102, 108, 168)
HSL	hsl(235, 28%, 53%)
HSV	hsv(235, 39%, 66%)
CMYK	cmyk(39.3%, 35.7%, 0%, 34.1%)
CIE-LAB	lab(47.46, 13.09, -32.92)
CIE-LCH	lch(47.46, 35.43, 291.68°)
OKLab	oklab(55.2% 0.0138 -0.0923)
OKLCH	oklch(55.2% 0.093 278.5)
XYZ	xyz(17.9079, 16.3763, 39.2556)
Luminance	0.1638 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CA8 #A8A266

analogous

#668DA8 #666CA8 #8166A8

triadic

#666CA8 #A8666C #6CA866

tetradic

#666CA8 #A8668D #A8A266 #66A881

square

#666CA8 #A8668D #A8A266 #66A881

split-complementary

#666CA8 #A88166 #8DA866

monochromatic

#36395E #4C5185 #666CA8 #8D91BE #B4B7D4

Accessibility & contrast

On white

4.91

#666CA8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.28

#666CA8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CA8

4.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CA8	#FFFFFF	#000000	##FFFFFF
##666CA8	1.00	4.91	4.28	4.91
#FFFFFF	4.91	1.00	21.00	1.00
#000000	4.28	21.00	1.00	21.00
##FFFFFF	4.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5873AA

Deuteranopia (green-blind)

#546EA7

Tritanopia (blue-blind)

#527882

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #666ca8;
/* rgb */ color: rgb(102, 108, 168);
/* oklch */ color: oklch(55.2% 0.093 278.5);

Tailwind

colors: {
  custom: {
    50: '#9496c2',
    500: '#666ca8',
    950: '#000000',
  },
}

SCSS

$custom: #666ca8;
$custom-light: #9496c2;
$custom-dark: #000000;

JSON

{
  "hex": "#666ca8",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 168
  },
  "hsl": {
    "h": 234.545,
    "s": 27.5,
    "l": 52.941
  },
  "oklch": {
    "l": 0.552,
    "c": 0.09329,
    "h": 278.5
  },
  "luminance": 0.16377
}

Semantic roles & 50–950 ramp

primary

#666CA8

secondary

#C3C1A7

accent

#BB64C4

background

#F9F9FB

surface

#F2F1F7

border

#CCCBD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666CA8

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

Preview Lab → · Contrast checker → · Palette generator →