#666DBD#666DBD

#666DBD is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.6% C 0.123 H 277.9°. Best body text is #FFFFFF at 4.68:1 contrast (WCAG AA passes).

Color values

HEX	#666DBD
RGB	rgb(102, 109, 189)
HSL	hsl(235, 40%, 57%)
HSV	hsv(235, 46%, 74%)
CMYK	cmyk(46%, 42.3%, 0%, 25.9%)
CIE-LAB	lab(48.80, 18.71, -43.02)
CIE-LCH	lch(48.80, 46.91, 293.51°)
OKLab	oklab(56.58% 0.0169 -0.1217)
OKLCH	oklch(56.58% 0.123 277.9)
XYZ	xyz(20.1306, 17.4351, 50.4388)
Luminance	0.1744 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666DBD #BDB666

analogous

#6699BD #666DBD #8A66BD

triadic

#666DBD #BD666D #6DBD66

tetradic

#666DBD #BD6699 #BDB666 #66BD8A

square

#666DBD #BD6699 #BDB666 #66BD8A

split-complementary

#666DBD #BD8A66 #99BD66

monochromatic

#333876 #454DA1 #666DBD #9196CF #BCBFE2

Accessibility & contrast

On white

4.68

#666DBD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.49

#666DBD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666DBD

4.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666DBD	#FFFFFF	#000000	##FFFFFF
##666DBD	1.00	4.68	4.49	4.68
#FFFFFF	4.68	1.00	21.00	1.00
#000000	4.49	21.00	1.00	21.00
##FFFFFF	4.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E77C0

Deuteranopia (green-blind)

#4871BB

Tritanopia (blue-blind)

#487E8C

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666dbd;
/* rgb */ color: rgb(102, 109, 189);
/* oklch */ color: oklch(56.6% 0.123 277.9);

Tailwind

colors: {
  custom: {
    50: '#9696d1',
    500: '#666dbd',
    950: '#000000',
  },
}

SCSS

$custom: #666dbd;
$custom-light: #9696d1;
$custom-dark: #000000;

JSON

{
  "hex": "#666dbd",
  "rgb": {
    "r": 102,
    "g": 109,
    "b": 189
  },
  "hsl": {
    "h": 235.172,
    "s": 39.726,
    "l": 57.059
  },
  "oklch": {
    "l": 0.56577,
    "c": 0.12283,
    "h": 277.9
  },
  "luminance": 0.17436
}

Semantic roles & 50–950 ramp

primary

#666DBD

secondary

#D1CEAE

accent

#C658D0

background

#F9F9FC

surface

#F2F2F9

border

#CCCCD2

text

#0E0D14

muted

#7E7E82

Preview Lab

Preview with #666DBD

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

Preview Lab → · Contrast checker → · Palette generator →