#666FA3#666FA3

#666FA3 is a mid, moderate blue. Relative luminance 0.168; OKLCH L 55.6% C 0.082 H 275.9°. Best body text is #FFFFFF at 4.81:1 contrast (WCAG AA passes).

Color values

HEX	#666FA3
RGB	rgb(102, 111, 163)
HSL	hsl(231, 25%, 52%)
HSV	hsv(231, 37%, 64%)
CMYK	cmyk(37.4%, 31.9%, 0%, 36.1%)
CIE-LAB	lab(48.05, 9.82, -29.07)
CIE-LCH	lch(48.05, 30.69, 288.67°)
OKLab	oklab(55.58% 0.0084 -0.0811)
OKLCH	oklch(55.58% 0.082 275.9)
XYZ	xyz(17.7729, 16.8373, 36.9567)
Luminance	0.1684 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FA3 #A39A66

analogous

#668EA3 #666FA3 #7C66A3

triadic

#666FA3 #A3666F #6FA366

tetradic

#666FA3 #A3668E #A39A66 #66A37C

square

#666FA3 #A3668E #A39A66 #66A37C

split-complementary

#666FA3 #A37C66 #8EA366

monochromatic

#363B59 #4D547F #666FA3 #8C93BA #B2B7D1

Accessibility & contrast

On white

4.81

#666FA3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.37

#666FA3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666FA3

4.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FA3	#FFFFFF	#000000	##FFFFFF
##666FA3	1.00	4.81	4.37	4.81
#FFFFFF	4.81	1.00	21.00	1.00
#000000	4.37	21.00	1.00	21.00
##FFFFFF	4.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5E75A5

Deuteranopia (green-blind)

#5A70A2

Tritanopia (blue-blind)

#547982

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666fa3;
/* rgb */ color: rgb(102, 111, 163);
/* oklch */ color: oklch(55.6% 0.082 275.9);

Tailwind

colors: {
  custom: {
    50: '#9498be',
    500: '#666fa3',
    950: '#000000',
  },
}

SCSS

$custom: #666fa3;
$custom-light: #9498be;
$custom-dark: #000000;

JSON

{
  "hex": "#666fa3",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 163
  },
  "hsl": {
    "h": 231.148,
    "s": 24.898,
    "l": 51.961
  },
  "oklch": {
    "l": 0.55579,
    "c": 0.08155,
    "h": 275.9
  },
  "luminance": 0.16838
}

Semantic roles & 50–950 ramp

primary

#666FA3

secondary

#C0BCA5

accent

#B466C1

background

#F9F9FB

surface

#F1F2F7

border

#CBCCD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666FA3

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

Preview Lab → · Contrast checker → · Palette generator →