#666DA5#666DA5

#666DA5 is a mid, moderate blue. Relative luminance 0.165; OKLCH L 55.3% C 0.087 H 277.7°. Best body text is #FFFFFF at 4.89:1 contrast (WCAG AA passes).

Color values

HEX	#666DA5
RGB	rgb(102, 109, 165)
HSL	hsl(233, 26%, 52%)
HSV	hsv(233, 38%, 65%)
CMYK	cmyk(38.2%, 33.9%, 0%, 35.3%)
CIE-LAB	lab(47.60, 11.61, -30.96)
CIE-LCH	lch(47.60, 33.07, 290.56°)
OKLab	oklab(55.26% 0.0117 -0.0866)
OKLCH	oklch(55.26% 0.087 277.7)
XYZ	xyz(17.7377, 16.4780, 37.8360)
Luminance	0.1648 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DA5 #A59E66

analogous

#668DA5 #666DA5 #7E66A5

triadic

#666DA5 #A5666D #6DA566

tetradic

#666DA5 #A5668D #A59E66 #66A57E

square

#666DA5 #A5668D #A59E66 #66A57E

split-complementary

#666DA5 #A57E66 #8DA566

monochromatic

#363A5B #4C5282 #666DA5 #8D92BC #B3B7D2

Accessibility & contrast

On white

4.89

#666DA5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.30

#666DA5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666DA5

4.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DA5	#FFFFFF	#000000	##FFFFFF
##666DA5	1.00	4.89	4.30	4.89
#FFFFFF	4.89	1.00	21.00	1.00
#000000	4.30	21.00	1.00	21.00
##FFFFFF	4.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5B73A7

Deuteranopia (green-blind)

#576FA4

Tritanopia (blue-blind)

#547881

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #666da5;
/* rgb */ color: rgb(102, 109, 165);
/* oklch */ color: oklch(55.3% 0.087 277.7);

Tailwind

colors: {
  custom: {
    50: '#9496c0',
    500: '#666da5',
    950: '#000000',
  },
}

SCSS

$custom: #666da5;
$custom-light: #9496c0;
$custom-dark: #000000;

JSON

{
  "hex": "#666da5",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 165
  },
  "hsl": {
    "h": 233.333,
    "s": 25.926,
    "l": 52.353
  },
  "oklch": {
    "l": 0.55255,
    "c": 0.08736,
    "h": 277.7
  },
  "luminance": 0.16479
}

Semantic roles & 50–950 ramp

primary

#666DA5

secondary

#C1BEA6

accent

#B865C2

background

#F9F9FB

surface

#F2F2F7

border

#CCCCD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666DA5

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

Preview Lab → · Contrast checker → · Palette generator →