#666BB0#666BB0

#666BB0 is a mid, moderate blue. Relative luminance 0.165; OKLCH L 55.4% C 0.107 H 279.2°. Best body text is #FFFFFF at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#666BB0
RGB	rgb(102, 107, 176)
HSL	hsl(236, 32%, 55%)
HSV	hsv(236, 42%, 69%)
CMYK	cmyk(42%, 39.2%, 0%, 31%)
CIE-LAB	lab(47.59, 16.04, -37.40)
CIE-LCH	lch(47.59, 40.70, 293.22°)
OKLab	oklab(55.43% 0.017 -0.1053)
OKLCH	oklch(55.43% 0.107 279.2)
XYZ	xyz(18.5713, 16.4739, 43.2671)
Luminance	0.1648 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BB0 #B0AB66

analogous

#6690B0 #666BB0 #8666B0

triadic

#666BB0 #B0666B #6BB066

tetradic

#666BB0 #B06690 #B0AB66 #66B086

square

#666BB0 #B06690 #B0AB66 #66B086

split-complementary

#666BB0 #B08666 #90B066

monochromatic

#353867 #4A4E8F #666BB0 #8E92C5 #B7B9DA

Accessibility & contrast

On white

4.89

#666BB0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.30

#666BB0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BB0

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BB0	#FFFFFF	#000000	##FFFFFF
##666BB0	1.00	4.89	4.30	4.89
#FFFFFF	4.89	1.00	21.00	1.00
#000000	4.30	21.00	1.00	21.00
##FFFFFF	4.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5374B3

Deuteranopia (green-blind)

#4E6EAE

Tritanopia (blue-blind)

#4F7985

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #666bb0;
/* rgb */ color: rgb(102, 107, 176);
/* oklch */ color: oklch(55.4% 0.107 279.2);

Tailwind

colors: {
  custom: {
    50: '#9595c8',
    500: '#666bb0',
    950: '#000000',
  },
}

SCSS

$custom: #666bb0;
$custom-light: #9595c8;
$custom-dark: #000000;

JSON

{
  "hex": "#666bb0",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 176
  },
  "hsl": {
    "h": 235.946,
    "s": 31.897,
    "l": 54.51
  },
  "oklch": {
    "l": 0.55427,
    "c": 0.10663,
    "h": 279.2
  },
  "luminance": 0.16475
}

Semantic roles & 50–950 ramp

primary

#666BB0

secondary

#C9C6A9

accent

#C160C8

background

#F9F9FC

surface

#F2F1F8

border

#CCCBD1

text

#0D0D13

muted

#7E7E82

Preview Lab

Preview with #666BB0

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

Preview Lab → · Contrast checker → · Palette generator →