#666FBF#666FBF

#666FBF is a mid, vivid blue. Relative luminance 0.180; OKLCH L 57.1% C 0.123 H 276.9°. Best body text is #000000 at 4.59:1 contrast (WCAG AA passes).

Color values

HEX	#666FBF
RGB	rgb(102, 111, 191)
HSL	hsl(234, 41%, 57%)
HSV	hsv(234, 47%, 75%)
CMYK	cmyk(46.6%, 41.9%, 0%, 25.1%)
CIE-LAB	lab(49.44, 18.10, -43.16)
CIE-LCH	lch(49.44, 46.80, 292.75°)
OKLab	oklab(57.1% 0.0148 -0.1221)
OKLCH	oklch(57.1% 0.123 276.9)
XYZ	xyz(20.5650, 17.9542, 51.6620)
Luminance	0.1795 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FBF #BFB666

analogous

#669BBF #666FBF #8A66BF

triadic

#666FBF #BF666F #6FBF66

tetradic

#666FBF #BF669B #BFB666 #66BF8A

square

#666FBF #BF669B #BFB666 #66BF8A

split-complementary

#666FBF #BF8A66 #9BBF66

monochromatic

#323978 #444EA3 #666FBF #9198D1 #BCC0E3

Accessibility & contrast

On white

4.57

#666FBF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.59

#666FBF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FBF

4.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FBF	#FFFFFF	#000000	##000000
##666FBF	1.00	4.57	4.59	4.59
#FFFFFF	4.57	1.00	21.00	21.00
#000000	4.59	21.00	1.00	1.00
##000000	4.59	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5079C2

Deuteranopia (green-blind)

#4972BD

Tritanopia (blue-blind)

#46808E

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #666fbf;
/* rgb */ color: rgb(102, 111, 191);
/* oklch */ color: oklch(57.1% 0.123 276.9);

Tailwind

colors: {
  custom: {
    50: '#9698d3',
    500: '#666fbf',
    950: '#000000',
  },
}

SCSS

$custom: #666fbf;
$custom-light: #9698d3;
$custom-dark: #000000;

JSON

{
  "hex": "#666fbf",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 191
  },
  "hsl": {
    "h": 233.933,
    "s": 41.014,
    "l": 57.451
  },
  "oklch": {
    "l": 0.57098,
    "c": 0.12296,
    "h": 276.9
  },
  "luminance": 0.17955
}

Semantic roles & 50–950 ramp

primary

#666FBF

secondary

#D2CFAE

accent

#C557D1

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666FBF

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

Preview Lab → · Contrast checker → · Palette generator →