#666EB4#666EB4

#666EB4 is a mid, moderate blue. Relative luminance 0.173; OKLCH L 56.3% C 0.108 H 277.4°. Best body text is #FFFFFF at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#666EB4
RGB	rgb(102, 110, 180)
HSL	hsl(234, 34%, 55%)
HSV	hsv(234, 43%, 71%)
CMYK	cmyk(43.3%, 38.9%, 0%, 29.4%)
CIE-LAB	lab(48.60, 15.39, -38.13)
CIE-LCH	lch(48.60, 41.12, 291.98°)
OKLab	oklab(56.27% 0.0139 -0.1074)
OKLCH	oklch(56.27% 0.108 277.4)
XYZ	xyz(19.2912, 17.2710, 45.4883)
Luminance	0.1727 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EB4 #B4AC66

analogous

#6695B4 #666EB4 #8566B4

triadic

#666EB4 #B4666E #6EB466

tetradic

#666EB4 #B46695 #B4AC66 #66B485

square

#666EB4 #B46695 #B4AC66 #66B485

split-complementary

#666EB4 #B48566 #95B466

monochromatic

#343A6B #495094 #666EB4 #8F95C8 #B8BCDC

Accessibility & contrast

On white

4.71

#666EB4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.45

#666EB4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666EB4

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EB4	#FFFFFF	#000000	##FFFFFF
##666EB4	1.00	4.71	4.45	4.71
#FFFFFF	4.71	1.00	21.00	1.00
#000000	4.45	21.00	1.00	21.00
##FFFFFF	4.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5577B7

Deuteranopia (green-blind)

#4F71B2

Tritanopia (blue-blind)

#4D7C88

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666eb4;
/* rgb */ color: rgb(102, 110, 180);
/* oklch */ color: oklch(56.3% 0.108 277.4);

Tailwind

colors: {
  custom: {
    50: '#9597cb',
    500: '#666eb4',
    950: '#000000',
  },
}

SCSS

$custom: #666eb4;
$custom-light: #9597cb;
$custom-dark: #000000;

JSON

{
  "hex": "#666eb4",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 180
  },
  "hsl": {
    "h": 233.846,
    "s": 34.211,
    "l": 55.294
  },
  "oklch": {
    "l": 0.56267,
    "c": 0.10829,
    "h": 277.4
  },
  "luminance": 0.17272
}

Semantic roles & 50–950 ramp

primary

#666EB4

secondary

#CBC8AB

accent

#BF5ECA

background

#F9F9FC

surface

#F2F2F8

border

#CCCCD1

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666EB4

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

Preview Lab → · Contrast checker → · Palette generator →