#666FA8#666FA8

#666FA8 is a mid, moderate blue. Relative luminance 0.170; OKLCH L 55.8% C 0.089 H 276.3°. Best body text is #FFFFFF at 4.77:1 contrast (WCAG AA passes).

Color values

HEX	#666FA8
RGB	rgb(102, 111, 168)
HSL	hsl(232, 28%, 53%)
HSV	hsv(232, 39%, 66%)
CMYK	cmyk(39.3%, 33.9%, 0%, 34.1%)
CIE-LAB	lab(48.29, 11.26, -31.64)
CIE-LCH	lch(48.29, 33.58, 289.58°)
OKLab	oklab(55.83% 0.0097 -0.0885)
OKLCH	oklch(55.83% 0.089 276.3)
XYZ	xyz(18.2297, 17.0200, 39.3629)
Luminance	0.1702 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FA8 #A89F66

analogous

#6690A8 #666FA8 #7E66A8

triadic

#666FA8 #A8666F #6FA866

tetradic

#666FA8 #A86690 #A89F66 #66A87E

square

#666FA8 #A86690 #A89F66 #66A87E

split-complementary

#666FA8 #A87E66 #90A866

monochromatic

#363B5E #4C5485 #666FA8 #8D94BE #B4B8D4

Accessibility & contrast

On white

4.77

#666FA8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.40

#666FA8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666FA8

4.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FA8	#FFFFFF	#000000	##FFFFFF
##666FA8	1.00	4.77	4.40	4.77
#FFFFFF	4.77	1.00	21.00	1.00
#000000	4.40	21.00	1.00	21.00
##FFFFFF	4.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C75AA

Deuteranopia (green-blind)

#5770A7

Tritanopia (blue-blind)

#527A84

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666fa8;
/* rgb */ color: rgb(102, 111, 168);
/* oklch */ color: oklch(55.8% 0.089 276.3);

Tailwind

colors: {
  custom: {
    50: '#9498c2',
    500: '#666fa8',
    950: '#000000',
  },
}

SCSS

$custom: #666fa8;
$custom-light: #9498c2;
$custom-dark: #000000;

JSON

{
  "hex": "#666fa8",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 168
  },
  "hsl": {
    "h": 231.818,
    "s": 27.5,
    "l": 52.941
  },
  "oklch": {
    "l": 0.55833,
    "c": 0.08907,
    "h": 276.3
  },
  "luminance": 0.17021
}

Semantic roles & 50–950 ramp

primary

#666FA8

secondary

#C3BFA7

accent

#B764C4

background

#F9F9FB

surface

#F2F2F7

border

#CCCCD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666FA8

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

Preview Lab → · Contrast checker → · Palette generator →