#666EA4#666EA4

#666EA4 is a mid, moderate blue. Relative luminance 0.167; OKLCH L 55.4% C 0.084 H 276.8°. Best body text is #FFFFFF at 4.85:1 contrast (WCAG AA passes).

Color values

HEX	#666EA4
RGB	rgb(102, 110, 164)
HSL	hsl(232, 25%, 52%)
HSV	hsv(232, 38%, 64%)
CMYK	cmyk(37.8%, 32.9%, 0%, 35.7%)
CIE-LAB	lab(47.82, 10.72, -30.02)
CIE-LCH	lch(47.82, 31.87, 289.65°)
OKLab	oklab(55.42% 0.01 -0.0838)
OKLCH	oklch(55.42% 0.084 276.8)
XYZ	xyz(17.7543, 16.6563, 37.3943)
Luminance	0.1666 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EA4 #A49C66

analogous

#668DA4 #666EA4 #7D66A4

triadic

#666EA4 #A4666E #6EA466

tetradic

#666EA4 #A4668D #A49C66 #66A47D

square

#666EA4 #A4668D #A49C66 #66A47D

split-complementary

#666EA4 #A47D66 #8DA466

monochromatic

#363A5A #4C5380 #666EA4 #8C92BB #B3B7D2

Accessibility & contrast

On white

4.85

#666EA4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.33

#666EA4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666EA4

4.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EA4	#FFFFFF	#000000	##FFFFFF
##666EA4	1.00	4.85	4.33	4.85
#FFFFFF	4.85	1.00	21.00	1.00
#000000	4.33	21.00	1.00	21.00
##FFFFFF	4.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5D74A6

Deuteranopia (green-blind)

#586FA3

Tritanopia (blue-blind)

#547981

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #666ea4;
/* rgb */ color: rgb(102, 110, 164);
/* oklch */ color: oklch(55.4% 0.084 276.8);

Tailwind

colors: {
  custom: {
    50: '#9497bf',
    500: '#666ea4',
    950: '#000000',
  },
}

SCSS

$custom: #666ea4;
$custom-light: #9497bf;
$custom-dark: #000000;

JSON

{
  "hex": "#666ea4",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 164
  },
  "hsl": {
    "h": 232.258,
    "s": 25.41,
    "l": 52.157
  },
  "oklch": {
    "l": 0.55416,
    "c": 0.08445,
    "h": 276.8
  },
  "luminance": 0.16657
}

Semantic roles & 50–950 ramp

primary

#666EA4

secondary

#C0BDA5

accent

#B666C2

background

#F9F9FB

surface

#F2F2F7

border

#CCCCD0

text

#0D0D12

muted

#7E7E81

Preview Lab

Preview with #666EA4

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

Preview Lab → · Contrast checker → · Palette generator →