#666EB8#666EB8

#666EB8 is a mid, moderate blue. Relative luminance 0.174; OKLCH L 56.5% C 0.114 H 277.4°. Best body text is #FFFFFF at 4.68:1 contrast (WCAG AA passes).

Color values

HEX	#666EB8
RGB	rgb(102, 110, 184)
HSL	hsl(234, 37%, 56%)
HSV	hsv(234, 45%, 72%)
CMYK	cmyk(44.6%, 40.2%, 0%, 27.8%)
CIE-LAB	lab(48.81, 16.59, -40.13)
CIE-LCH	lch(48.81, 43.42, 292.46°)
OKLab	oklab(56.49% 0.0147 -0.1132)
OKLCH	oklch(56.49% 0.114 277.4)
XYZ	xyz(19.7045, 17.4364, 47.6654)
Luminance	0.1744 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EB8 #B8B066

analogous

#6697B8 #666EB8 #8766B8

triadic

#666EB8 #B8666E #6EB866

tetradic

#666EB8 #B86697 #B8B066 #66B887

square

#666EB8 #B86697 #B8B066 #66B887

split-complementary

#666EB8 #B88766 #97B866

monochromatic

#343A70 #474F9A #666EB8 #9096CB #BABDDF

Accessibility & contrast

On white

4.68

#666EB8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.49

#666EB8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666EB8

4.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EB8	#FFFFFF	#000000	##FFFFFF
##666EB8	1.00	4.68	4.49	4.68
#FFFFFF	4.68	1.00	21.00	1.00
#000000	4.49	21.00	1.00	21.00
##FFFFFF	4.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5377BB

Deuteranopia (green-blind)

#4D71B6

Tritanopia (blue-blind)

#4A7D8A

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666eb8;
/* rgb */ color: rgb(102, 110, 184);
/* oklch */ color: oklch(56.5% 0.114 277.4);

Tailwind

colors: {
  custom: {
    50: '#9697cd',
    500: '#666eb8',
    950: '#000000',
  },
}

SCSS

$custom: #666eb8;
$custom-light: #9697cd;
$custom-dark: #000000;

JSON

{
  "hex": "#666eb8",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 184
  },
  "hsl": {
    "h": 234.146,
    "s": 36.607,
    "l": 56.078
  },
  "oklch": {
    "l": 0.56492,
    "c": 0.11416,
    "h": 277.4
  },
  "luminance": 0.17437
}

Semantic roles & 50–950 ramp

primary

#666EB8

secondary

#CECBAC

accent

#C25BCD

background

#F9F9FC

surface

#F2F2F9

border

#CCCCD2

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666EB8

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

Preview Lab → · Contrast checker → · Palette generator →