#666CA5#666CA5

#666CA5 is a mid, moderate blue. Relative luminance 0.163; OKLCH L 55.0% C 0.089 H 278.5°. Best body text is #FFFFFF at 4.94:1 contrast (WCAG AA passes).

Color values

HEX	#666CA5
RGB	rgb(102, 108, 165)
HSL	hsl(234, 26%, 52%)
HSV	hsv(234, 38%, 65%)
CMYK	cmyk(38.2%, 34.5%, 0%, 35.3%)
CIE-LAB	lab(47.32, 12.22, -31.39)
CIE-LCH	lch(47.32, 33.69, 291.28°)
OKLab	oklab(55.04% 0.0131 -0.0878)
OKLCH	oklch(55.04% 0.089 278.5)
XYZ	xyz(17.6316, 16.2658, 37.8006)
Luminance	0.1627 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666CA5 #A59F66

analogous

#668BA5 #666CA5 #8066A5

triadic

#666CA5 #A5666C #6CA566

tetradic

#666CA5 #A5668B #A59F66 #66A580

square

#666CA5 #A5668B #A59F66 #66A580

split-complementary

#666CA5 #A58066 #8BA566

monochromatic

#36395B #4C5182 #666CA5 #8D91BC #B3B6D2

Accessibility & contrast

On white

4.94

#666CA5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.25

#666CA5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666CA5

4.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666CA5	#FFFFFF	#000000	##FFFFFF
##666CA5	1.00	4.94	4.25	4.94
#FFFFFF	4.94	1.00	21.00	1.00
#000000	4.25	21.00	1.00	21.00
##FFFFFF	4.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5973A7

Deuteranopia (green-blind)

#566EA4

Tritanopia (blue-blind)

#547781

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #666ca5;
/* rgb */ color: rgb(102, 108, 165);
/* oklch */ color: oklch(55.0% 0.089 278.5);

Tailwind

colors: {
  custom: {
    50: '#9496c0',
    500: '#666ca5',
    950: '#000000',
  },
}

SCSS

$custom: #666ca5;
$custom-light: #9496c0;
$custom-dark: #000000;

JSON

{
  "hex": "#666ca5",
  "rgb": {
    "r": 102,
    "g": 108,
    "b": 165
  },
  "hsl": {
    "h": 234.286,
    "s": 25.926,
    "l": 52.353
  },
  "oklch": {
    "l": 0.55043,
    "c": 0.08879,
    "h": 278.5
  },
  "luminance": 0.16267
}

Semantic roles & 50–950 ramp

primary

#666CA5

secondary

#C1BFA6

accent

#B965C2

background

#F9F9FB

surface

#F2F1F7

border

#CCCBD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666CA5

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

Preview Lab → · Contrast checker → · Palette generator →