#666EB7#666EB7

#666EB7 is a mid, moderate blue. Relative luminance 0.174; OKLCH L 56.4% C 0.113 H 277.4°. Best body text is #FFFFFF at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#666EB7
RGB	rgb(102, 110, 183)
HSL	hsl(234, 36%, 56%)
HSV	hsv(234, 44%, 72%)
CMYK	cmyk(44.3%, 39.9%, 0%, 28.2%)
CIE-LAB	lab(48.75, 16.29, -39.63)
CIE-LCH	lch(48.75, 42.85, 292.35°)
OKLab	oklab(56.44% 0.0145 -0.1118)
OKLCH	oklch(56.44% 0.113 277.4)
XYZ	xyz(19.6001, 17.3946, 47.1153)
Luminance	0.1740 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EB7 #B7AF66

analogous

#6696B7 #666EB7 #8666B7

triadic

#666EB7 #B7666E #6EB766

tetradic

#666EB7 #B76696 #B7AF66 #66B786

square

#666EB7 #B76696 #B7AF66 #66B786

split-complementary

#666EB7 #B78666 #96B766

monochromatic

#343A6F #485098 #666EB7 #9095CB #B9BDDE

Accessibility & contrast

On white

4.69

#666EB7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.48

#666EB7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666EB7

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EB7	#FFFFFF	#000000	##FFFFFF
##666EB7	1.00	4.69	4.48	4.69
#FFFFFF	4.69	1.00	21.00	1.00
#000000	4.48	21.00	1.00	21.00
##FFFFFF	4.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5377BA

Deuteranopia (green-blind)

#4D71B5

Tritanopia (blue-blind)

#4B7D8A

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #666eb7;
/* rgb */ color: rgb(102, 110, 183);
/* oklch */ color: oklch(56.4% 0.113 277.4);

Tailwind

colors: {
  custom: {
    50: '#9597cd',
    500: '#666eb7',
    950: '#000000',
  },
}

SCSS

$custom: #666eb7;
$custom-light: #9597cd;
$custom-dark: #000000;

JSON

{
  "hex": "#666eb7",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 183
  },
  "hsl": {
    "h": 234.074,
    "s": 36,
    "l": 55.882
  },
  "oklch": {
    "l": 0.56435,
    "c": 0.1127,
    "h": 277.4
  },
  "luminance": 0.17396
}

Semantic roles & 50–950 ramp

primary

#666EB7

secondary

#CDCAAC

accent

#C15CCC

background

#F9F9FC

surface

#F2F2F9

border

#CCCCD2

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666EB7

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

Preview Lab → · Contrast checker → · Palette generator →