#666EA6#666EA6

#666EA6 is a mid, moderate blue. Relative luminance 0.167; OKLCH L 55.5% C 0.087 H 276.9°. Best body text is #FFFFFF at 4.83:1 contrast (WCAG AA passes).

Color values

HEX	#666EA6
RGB	rgb(102, 110, 166)
HSL	hsl(233, 26%, 53%)
HSV	hsv(233, 39%, 65%)
CMYK	cmyk(38.6%, 33.7%, 0%, 34.9%)
CIE-LAB	lab(47.92, 11.29, -31.04)
CIE-LCH	lch(47.92, 33.03, 289.98°)
OKLab	oklab(55.52% 0.0106 -0.0868)
OKLCH	oklch(55.52% 0.087 276.9)
XYZ	xyz(17.9363, 16.7291, 38.3530)
Luminance	0.1673 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EA6 #A69E66

analogous

#668EA6 #666EA6 #7E66A6

triadic

#666EA6 #A6666E #6EA666

tetradic

#666EA6 #A6668E #A69E66 #66A67E

square

#666EA6 #A6668E #A69E66 #66A67E

split-complementary

#666EA6 #A67E66 #8EA666

monochromatic

#363A5C #4C5383 #666EA6 #8D93BD #B3B7D3

Accessibility & contrast

On white

4.83

#666EA6 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.35

#666EA6 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666EA6

4.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EA6	#FFFFFF	#000000	##FFFFFF
##666EA6	1.00	4.83	4.35	4.83
#FFFFFF	4.83	1.00	21.00	1.00
#000000	4.35	21.00	1.00	21.00
##FFFFFF	4.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C74A8

Deuteranopia (green-blind)

#576FA5

Tritanopia (blue-blind)

#537982

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666ea6;
/* rgb */ color: rgb(102, 110, 166);
/* oklch */ color: oklch(55.5% 0.087 276.9);

Tailwind

colors: {
  custom: {
    50: '#9497c0',
    500: '#666ea6',
    950: '#000000',
  },
}

SCSS

$custom: #666ea6;
$custom-light: #9497c0;
$custom-dark: #000000;

JSON

{
  "hex": "#666ea6",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 166
  },
  "hsl": {
    "h": 232.5,
    "s": 26.446,
    "l": 52.549
  },
  "oklch": {
    "l": 0.55518,
    "c": 0.08746,
    "h": 276.9
  },
  "luminance": 0.1673
}

Semantic roles & 50–950 ramp

primary

#666EA6

secondary

#C2BEA6

accent

#B765C3

background

#F9F9FB

surface

#F2F2F7

border

#CCCCD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666EA6

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

Preview Lab → · Contrast checker → · Palette generator →