#666BC8#666BC8

#666BC8 is a mid, vivid blue. Relative luminance 0.175; OKLCH L 56.8% C 0.141 H 278.6°. Best body text is #FFFFFF at 4.66:1 contrast (WCAG AA passes).

Color values

HEX	#666BC8
RGB	rgb(102, 107, 200)
HSL	hsl(237, 47%, 59%)
HSV	hsv(237, 49%, 78%)
CMYK	cmyk(49%, 46.5%, 0%, 21.6%)
CIE-LAB	lab(48.90, 23.31, -49.20)
CIE-LCH	lch(48.90, 54.45, 295.35°)
OKLab	oklab(56.85% 0.0211 -0.1398)
OKLCH	oklch(56.85% 0.141 278.6)
XYZ	xyz(21.1593, 17.5091, 56.8970)
Luminance	0.1751 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BC8 #C8C366

analogous

#669CC8 #666BC8 #9266C8

triadic

#666BC8 #C8666B #6BC866

tetradic

#666BC8 #C8669C #C8C366 #66C892

square

#666BC8 #C8669C #C8C366 #66C892

split-complementary

#666BC8 #C89266 #9CC866

monochromatic

#2F3484 #4045B1 #666BC8 #9397D8 #C0C2E8

Accessibility & contrast

On white

4.66

#666BC8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.50

#666BC8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666BC8

4.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BC8	#FFFFFF	#000000	##FFFFFF
##666BC8	1.00	4.66	4.50	4.66
#FFFFFF	4.66	1.00	21.00	1.00
#000000	4.50	21.00	1.00	21.00
##FFFFFF	4.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4378CB

Deuteranopia (green-blind)

#3B70C6

Tritanopia (blue-blind)

#417F90

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666bc8;
/* rgb */ color: rgb(102, 107, 200);
/* oklch */ color: oklch(56.8% 0.141 278.6);

Tailwind

colors: {
  custom: {
    50: '#9795d9',
    500: '#666bc8',
    950: '#000000',
  },
}

SCSS

$custom: #666bc8;
$custom-light: #9795d9;
$custom-dark: #000000;

JSON

{
  "hex": "#666bc8",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 200
  },
  "hsl": {
    "h": 236.939,
    "s": 47.115,
    "l": 59.216
  },
  "oklch": {
    "l": 0.56846,
    "c": 0.14137,
    "h": 278.6
  },
  "luminance": 0.1751
}

Semantic roles & 50–950 ramp

primary

#666BC8

secondary

#D8D6B2

accent

#D051D7

background

#F9F9FD

surface

#F2F1FA

border

#CCCBD3

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666BC8

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

Preview Lab → · Contrast checker → · Palette generator →