#666FA5#666FA5

#666FA5 is a mid, moderate blue. Relative luminance 0.169; OKLCH L 55.7% C 0.085 H 276.1°. Best body text is #FFFFFF at 4.79:1 contrast (WCAG AA passes).

Color values

HEX	#666FA5
RGB	rgb(102, 111, 165)
HSL	hsl(231, 26%, 52%)
HSV	hsv(231, 38%, 65%)
CMYK	cmyk(38.2%, 32.7%, 0%, 35.3%)
CIE-LAB	lab(48.15, 10.39, -30.10)
CIE-LCH	lch(48.15, 31.85, 289.05°)
OKLab	oklab(55.68% 0.0089 -0.0841)
OKLCH	oklch(55.68% 0.085 276.1)
XYZ	xyz(17.9535, 16.9095, 37.9079)
Luminance	0.1691 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FA5 #A59C66

analogous

#668EA5 #666FA5 #7D66A5

triadic

#666FA5 #A5666F #6FA566

tetradic

#666FA5 #A5668E #A59C66 #66A57D

square

#666FA5 #A5668E #A59C66 #66A57D

split-complementary

#666FA5 #A57D66 #8EA566

monochromatic

#363B5B #4C5482 #666FA5 #8D93BC #B3B8D2

Accessibility & contrast

On white

4.79

#666FA5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.38

#666FA5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666FA5

4.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FA5	#FFFFFF	#000000	##FFFFFF
##666FA5	1.00	4.79	4.38	4.79
#FFFFFF	4.79	1.00	21.00	1.00
#000000	4.38	21.00	1.00	21.00
##FFFFFF	4.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5D75A7

Deuteranopia (green-blind)

#5970A4

Tritanopia (blue-blind)

#537A82

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666fa5;
/* rgb */ color: rgb(102, 111, 165);
/* oklch */ color: oklch(55.7% 0.085 276.1);

Tailwind

colors: {
  custom: {
    50: '#9498c0',
    500: '#666fa5',
    950: '#000000',
  },
}

SCSS

$custom: #666fa5;
$custom-light: #9498c0;
$custom-dark: #000000;

JSON

{
  "hex": "#666fa5",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 165
  },
  "hsl": {
    "h": 231.429,
    "s": 25.926,
    "l": 52.353
  },
  "oklch": {
    "l": 0.5568,
    "c": 0.08456,
    "h": 276.1
  },
  "luminance": 0.1691
}

Semantic roles & 50–950 ramp

primary

#666FA5

secondary

#C1BDA6

accent

#B565C2

background

#F9F9FB

surface

#F2F2F7

border

#CCCCD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666FA5

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

Preview Lab → · Contrast checker → · Palette generator →