#666CB8#666CB8

#666CB8 is a mid, moderate blue. Relative luminance 0.170; OKLCH L 56.1% C 0.117 H 278.5°. Best body text is #FFFFFF at 4.77:1 contrast (WCAG AA passes).

Color values

HEX	#666CB8
RGB	rgb(102, 108, 184)
HSL	hsl(236, 37%, 56%)
HSV	hsv(236, 45%, 72%)
CMYK	cmyk(44.6%, 41.3%, 0%, 27.8%)
CIE-LAB	lab(48.27, 17.82, -40.97)
CIE-LCH	lch(48.27, 44.68, 293.50°)
OKLab	oklab(56.08% 0.0173 -0.1157)
OKLCH	oklch(56.08% 0.117 278.5)
XYZ	xyz(19.4912, 17.0096, 47.5943)
Luminance	0.1701 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CB8 #B8B266

analogous

#6695B8 #666CB8 #8966B8

triadic

#666CB8 #B8666C #6CB866

tetradic

#666CB8 #B86695 #B8B266 #66B889

square

#666CB8 #B86695 #B8B266 #66B889

split-complementary

#666CB8 #B88966 #95B866

monochromatic

#343870 #474D9A #666CB8 #9094CB #BABCDF

Accessibility & contrast

On white

4.77

#666CB8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.40

#666CB8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CB8

4.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CB8	#FFFFFF	#000000	##FFFFFF
##666CB8	1.00	4.77	4.40	4.77
#FFFFFF	4.77	1.00	21.00	1.00
#000000	4.40	21.00	1.00	21.00
##FFFFFF	4.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5076BB

Deuteranopia (green-blind)

#4A70B6

Tritanopia (blue-blind)

#4B7C89

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666cb8;
/* rgb */ color: rgb(102, 108, 184);
/* oklch */ color: oklch(56.1% 0.117 278.5);

Tailwind

colors: {
  custom: {
    50: '#9696ce',
    500: '#666cb8',
    950: '#000000',
  },
}

SCSS

$custom: #666cb8;
$custom-light: #9696ce;
$custom-dark: #000000;

JSON

{
  "hex": "#666cb8",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 184
  },
  "hsl": {
    "h": 235.61,
    "s": 36.607,
    "l": 56.078
  },
  "oklch": {
    "l": 0.56084,
    "c": 0.11696,
    "h": 278.5
  },
  "luminance": 0.17011
}

Semantic roles & 50–950 ramp

primary

#666CB8

secondary

#CECBAC

accent

#C45BCD

background

#F9F9FC

surface

#F2F1F9

border

#CCCBD2

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666CB8

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

Preview Lab → · Contrast checker → · Palette generator →