#666BB3#666BB3

#666BB3 is a mid, moderate blue. Relative luminance 0.166; OKLCH L 55.6% C 0.111 H 279.1°. Best body text is #FFFFFF at 4.86:1 contrast (WCAG AA passes).

Color values

HEX	#666BB3
RGB	rgb(102, 107, 179)
HSL	hsl(236, 34%, 55%)
HSV	hsv(236, 43%, 70%)
CMYK	cmyk(43%, 40.2%, 0%, 29.8%)
CIE-LAB	lab(47.74, 16.93, -38.90)
CIE-LCH	lch(47.74, 42.43, 293.52°)
OKLab	oklab(55.6% 0.0176 -0.1096)
OKLCH	oklch(55.6% 0.111 279.1)
XYZ	xyz(18.8714, 16.5940, 44.8477)
Luminance	0.1659 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BB3 #B3AE66

analogous

#6691B3 #666BB3 #8866B3

triadic

#666BB3 #B3666B #6BB366

tetradic

#666BB3 #B36691 #B3AE66 #66B388

square

#666BB3 #B36691 #B3AE66 #66B388

split-complementary

#666BB3 #B38866 #91B366

monochromatic

#35386A #494E93 #666BB3 #8F93C7 #B8BADC

Accessibility & contrast

On white

4.86

#666BB3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.32

#666BB3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BB3

4.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BB3	#FFFFFF	#000000	##FFFFFF
##666BB3	1.00	4.86	4.32	4.86
#FFFFFF	4.86	1.00	21.00	1.00
#000000	4.32	21.00	1.00	21.00
##FFFFFF	4.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5174B6

Deuteranopia (green-blind)

#4C6FB1

Tritanopia (blue-blind)

#4D7A86

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #666bb3;
/* rgb */ color: rgb(102, 107, 179);
/* oklch */ color: oklch(55.6% 0.111 279.1);

Tailwind

colors: {
  custom: {
    50: '#9595ca',
    500: '#666bb3',
    950: '#000000',
  },
}

SCSS

$custom: #666bb3;
$custom-light: #9595ca;
$custom-dark: #000000;

JSON

{
  "hex": "#666bb3",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 179
  },
  "hsl": {
    "h": 236.104,
    "s": 33.624,
    "l": 55.098
  },
  "oklch": {
    "l": 0.55595,
    "c": 0.11105,
    "h": 279.1
  },
  "luminance": 0.16595
}

Semantic roles & 50–950 ramp

primary

#666BB3

secondary

#CBC8AA

accent

#C35ECA

background

#F9F9FC

surface

#F2F1F8

border

#CCCBD1

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666BB3

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

Preview Lab → · Contrast checker → · Palette generator →