#666F8A#666F8A

#666F8A is a mid, muted blue. Relative luminance 0.160; OKLCH L 54.4% C 0.044 H 270.5°. Best body text is #FFFFFF at 4.99:1 contrast (WCAG AA passes).

Color values

HEX	#666F8A
RGB	rgb(102, 111, 138)
HSL	hsl(225, 15%, 47%)
HSV	hsv(225, 26%, 54%)
CMYK	cmyk(26.1%, 19.6%, 0%, 45.9%)
CIE-LAB	lab(47.01, 3.03, -15.92)
CIE-LCH	lch(47.01, 16.21, 280.78°)
OKLab	oklab(54.42% 0.0004 -0.0436)
OKLCH	oklch(54.42% 0.044 270.5)
XYZ	xyz(15.7502, 16.0282, 26.3037)
Luminance	0.1603 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666F8A #8A8166

analogous

#66818A #666F8A #6F668A

triadic

#666F8A #8A666F #6F8A66

tetradic

#666F8A #8A6681 #8A8166 #668A6F

square

#666F8A #8A6681 #8A8166 #668A6F

split-complementary

#666F8A #8A6F66 #818A66

monochromatic

#323644 #4C5367 #666F8A #878FA6 #AAB0C0

Accessibility & contrast

On white

4.99

#666F8A on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.21

#666F8A on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666F8A

4.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666F8A	#FFFFFF	#000000	##FFFFFF
##666F8A	1.00	4.99	4.21	4.99
#FFFFFF	4.99	1.00	21.00	1.00
#000000	4.21	21.00	1.00	21.00
##FFFFFF	4.99	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#67718B

Deuteranopia (green-blind)

#646E89

Tritanopia (blue-blind)

#5D7478

Achromatopsia (no color)

#6F6F6F

Design tokens & code

CSS

--color: #666f8a;
/* rgb */ color: rgb(102, 111, 138);
/* oklch */ color: oklch(54.4% 0.044 270.5);

Tailwind

colors: {
  custom: {
    50: '#9298ac',
    500: '#666f8a',
    950: '#000000',
  },
}

SCSS

$custom: #666f8a;
$custom-light: #9298ac;
$custom-dark: #000000;

JSON

{
  "hex": "#666f8a",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 138
  },
  "hsl": {
    "h": 225,
    "s": 15,
    "l": 47.059
  },
  "oklch": {
    "l": 0.54424,
    "c": 0.04365,
    "h": 270.5
  },
  "luminance": 0.16029
}

Semantic roles & 50–950 ramp

primary

#666F8A

secondary

#AFAB9D

accent

#A670B8

background

#F9F9FA

surface

#F1F2F4

border

#CBCCCE

text

#0D0D10

muted

#7E7E7F

Preview Lab

Preview with #666F8A

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

Preview Lab → · Contrast checker → · Palette generator →