#666BC4#666BC4

#666BC4 is a mid, vivid blue. Relative luminance 0.173; OKLCH L 56.6% C 0.136 H 278.7°. Best body text is #FFFFFF at 4.70:1 contrast (WCAG AA passes).

Color values

HEX	#666BC4
RGB	rgb(102, 107, 196)
HSL	hsl(237, 44%, 58%)
HSV	hsv(237, 48%, 77%)
CMYK	cmyk(48%, 45.4%, 0%, 23.1%)
CIE-LAB	lab(48.67, 22.08, -47.27)
CIE-LCH	lch(48.67, 52.17, 295.04°)
OKLab	oklab(56.6% 0.0205 -0.1341)
OKLCH	oklch(56.6% 0.136 278.7)
XYZ	xyz(20.6979, 17.3246, 54.4672)
Luminance	0.1733 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BC4 #C4BF66

analogous

#669AC4 #666BC4 #9066C4

triadic

#666BC4 #C4666B #6BC466

tetradic

#666BC4 #C4669A #C4BF66 #66C490

square

#666BC4 #C4669A #C4BF66 #66C490

split-complementary

#666BC4 #C49066 #9AC466

monochromatic

#31357F #4247AB #666BC4 #9296D5 #BEC0E6

Accessibility & contrast

On white

4.70

#666BC4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.47

#666BC4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BC4

4.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BC4	#FFFFFF	#000000	##FFFFFF
##666BC4	1.00	4.70	4.47	4.70
#FFFFFF	4.70	1.00	21.00	1.00
#000000	4.47	21.00	1.00	21.00
##FFFFFF	4.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4677C7

Deuteranopia (green-blind)

#3F70C2

Tritanopia (blue-blind)

#437E8E

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666bc4;
/* rgb */ color: rgb(102, 107, 196);
/* oklch */ color: oklch(56.6% 0.136 278.7);

Tailwind

colors: {
  custom: {
    50: '#9795d6',
    500: '#666bc4',
    950: '#000000',
  },
}

SCSS

$custom: #666bc4;
$custom-light: #9795d6;
$custom-dark: #000000;

JSON

{
  "hex": "#666bc4",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 196
  },
  "hsl": {
    "h": 236.809,
    "s": 44.34,
    "l": 58.431
  },
  "oklch": {
    "l": 0.56598,
    "c": 0.13568,
    "h": 278.7
  },
  "luminance": 0.17326
}

Semantic roles & 50–950 ramp

primary

#666BC4

secondary

#D6D4B0

accent

#CD54D4

background

#F9F9FD

surface

#F2F1FA

border

#CCCBD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666BC4

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

Preview Lab → · Contrast checker → · Palette generator →