#666FB4#666FB4

#666FB4 is a mid, moderate blue. Relative luminance 0.175; OKLCH L 56.5% C 0.107 H 276.8°. Best body text is #FFFFFF at 4.67:1 contrast (WCAG AA passes).

Color values

HEX	#666FB4
RGB	rgb(102, 111, 180)
HSL	hsl(233, 34%, 55%)
HSV	hsv(233, 43%, 71%)
CMYK	cmyk(43.3%, 38.3%, 0%, 29.4%)
CIE-LAB	lab(48.87, 14.78, -37.71)
CIE-LCH	lch(48.87, 40.50, 291.40°)
OKLab	oklab(56.47% 0.0126 -0.1061)
OKLCH	oklch(56.47% 0.107 276.8)
XYZ	xyz(19.3997, 17.4880, 45.5245)
Luminance	0.1749 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FB4 #B4AB66

analogous

#6696B4 #666FB4 #8466B4

triadic

#666FB4 #B4666F #6FB466

tetradic

#666FB4 #B46696 #B4AB66 #66B484

square

#666FB4 #B46696 #B4AB66 #66B484

split-complementary

#666FB4 #B48466 #96B466

monochromatic

#343B6B #495194 #666FB4 #8F96C8 #B8BCDC

Accessibility & contrast

On white

4.67

#666FB4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.50

#666FB4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #666FB4

4.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FB4	#FFFFFF	#000000	##FFFFFF
##666FB4	1.00	4.67	4.50	4.67
#FFFFFF	4.67	1.00	21.00	1.00
#000000	4.50	21.00	1.00	21.00
##FFFFFF	4.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5677B7

Deuteranopia (green-blind)

#5171B2

Tritanopia (blue-blind)

#4C7D89

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666fb4;
/* rgb */ color: rgb(102, 111, 180);
/* oklch */ color: oklch(56.5% 0.107 276.8);

Tailwind

colors: {
  custom: {
    50: '#9598cb',
    500: '#666fb4',
    950: '#000000',
  },
}

SCSS

$custom: #666fb4;
$custom-light: #9598cb;
$custom-dark: #000000;

JSON

{
  "hex": "#666fb4",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 180
  },
  "hsl": {
    "h": 233.077,
    "s": 34.211,
    "l": 55.294
  },
  "oklch": {
    "l": 0.56474,
    "c": 0.10689,
    "h": 276.8
  },
  "luminance": 0.17489
}

Semantic roles & 50–950 ramp

primary

#666FB4

secondary

#CBC7AB

accent

#BE5ECA

background

#F9F9FC

surface

#F2F2F8

border

#CCCCD1

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666FB4

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

Preview Lab → · Contrast checker → · Palette generator →