#666BB6#666BB6

#666BB6 is a mid, moderate blue. Relative luminance 0.167; OKLCH L 55.8% C 0.115 H 279.1°. Best body text is #FFFFFF at 4.83:1 contrast (WCAG AA passes).

Color values

HEX	#666BB6
RGB	rgb(102, 107, 182)
HSL	hsl(236, 35%, 56%)
HSV	hsv(236, 44%, 71%)
CMYK	cmyk(44%, 41.2%, 0%, 28.6%)
CIE-LAB	lab(47.90, 17.83, -40.40)
CIE-LCH	lch(47.90, 44.16, 293.81°)
OKLab	oklab(55.77% 0.0182 -0.114)
OKLCH	oklch(55.77% 0.115 279.1)
XYZ	xyz(19.1782, 16.7167, 46.4630)
Luminance	0.1672 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BB6 #B6B166

analogous

#6693B6 #666BB6 #8966B6

triadic

#666BB6 #B6666B #6BB666

tetradic

#666BB6 #B66693 #B6B166 #66B689

square

#666BB6 #B66693 #B6B166 #66B689

split-complementary

#666BB6 #B68966 #93B666

monochromatic

#34386D #484D97 #666BB6 #8F93CA #B9BBDE

Accessibility & contrast

On white

4.83

#666BB6 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.34

#666BB6 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BB6

4.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BB6	#FFFFFF	#000000	##FFFFFF
##666BB6	1.00	4.83	4.34	4.83
#FFFFFF	4.83	1.00	21.00	1.00
#000000	4.34	21.00	1.00	21.00
##FFFFFF	4.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4F75B9

Deuteranopia (green-blind)

#4A6FB4

Tritanopia (blue-blind)

#4C7A88

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666bb6;
/* rgb */ color: rgb(102, 107, 182);
/* oklch */ color: oklch(55.8% 0.115 279.1);

Tailwind

colors: {
  custom: {
    50: '#9595cc',
    500: '#666bb6',
    950: '#000000',
  },
}

SCSS

$custom: #666bb6;
$custom-light: #9595cc;
$custom-dark: #000000;

JSON

{
  "hex": "#666bb6",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 182
  },
  "hsl": {
    "h": 236.25,
    "s": 35.398,
    "l": 55.686
  },
  "oklch": {
    "l": 0.55766,
    "c": 0.11545,
    "h": 279.1
  },
  "luminance": 0.16718
}

Semantic roles & 50–950 ramp

primary

#666BB6

secondary

#CDCAAB

accent

#C45CCB

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666BB6

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

Preview Lab → · Contrast checker → · Palette generator →