#666CC8#666CC8

#666CC8 is a mid, vivid blue. Relative luminance 0.177; OKLCH L 57.0% C 0.140 H 278.2°. Best body text is #FFFFFF at 4.62:1 contrast (WCAG AA passes).

Color values

HEX	#666CC8
RGB	rgb(102, 108, 200)
HSL	hsl(236, 47%, 59%)
HSV	hsv(236, 49%, 78%)
CMYK	cmyk(49%, 46%, 0%, 21.6%)
CIE-LAB	lab(49.15, 22.70, -48.79)
CIE-LCH	lch(49.15, 53.81, 294.95°)
OKLab	oklab(57.04% 0.0199 -0.1386)
OKLCH	oklch(57.04% 0.14 278.2)
XYZ	xyz(21.2642, 17.7188, 56.9320)
Luminance	0.1772 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CC8 #C8C266

analogous

#669DC8 #666CC8 #9166C8

triadic

#666CC8 #C8666C #6CC866

tetradic

#666CC8 #C8669D #C8C266 #66C891

square

#666CC8 #C8669D #C8C266 #66C891

split-complementary

#666CC8 #C89166 #9DC866

monochromatic

#2F3584 #4047B1 #666CC8 #9397D8 #C0C3E8

Accessibility & contrast

On white

4.62

#666CC8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.54

#666CC8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666CC8

4.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CC8	#FFFFFF	#000000	##FFFFFF
##666CC8	1.00	4.62	4.54	4.62
#FFFFFF	4.62	1.00	21.00	1.00
#000000	4.54	21.00	1.00	21.00
##FFFFFF	4.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4579CB

Deuteranopia (green-blind)

#3D71C6

Tritanopia (blue-blind)

#408090

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #666cc8;
/* rgb */ color: rgb(102, 108, 200);
/* oklch */ color: oklch(57.0% 0.140 278.2);

Tailwind

colors: {
  custom: {
    50: '#9796d9',
    500: '#666cc8',
    950: '#000000',
  },
}

SCSS

$custom: #666cc8;
$custom-light: #9796d9;
$custom-dark: #000000;

JSON

{
  "hex": "#666cc8",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 200
  },
  "hsl": {
    "h": 236.327,
    "s": 47.115,
    "l": 59.216
  },
  "oklch": {
    "l": 0.57041,
    "c": 0.14,
    "h": 278.2
  },
  "luminance": 0.1772
}

Semantic roles & 50–950 ramp

primary

#666CC8

secondary

#D8D6B2

accent

#CF51D7

background

#F9F9FD

surface

#F2F1FA

border

#CCCBD3

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666CC8

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

Preview Lab → · Contrast checker → · Palette generator →