#666BB4#666BB4

#666BB4 is a mid, moderate blue. Relative luminance 0.166; OKLCH L 55.7% C 0.113 H 279.1°. Best body text is #FFFFFF at 4.85:1 contrast (WCAG AA passes).

Color values

HEX	#666BB4
RGB	rgb(102, 107, 180)
HSL	hsl(236, 34%, 55%)
HSV	hsv(236, 43%, 71%)
CMYK	cmyk(43.3%, 40.6%, 0%, 29.4%)
CIE-LAB	lab(47.80, 17.23, -39.40)
CIE-LCH	lch(47.80, 43.01, 293.62°)
OKLab	oklab(55.65% 0.0178 -0.1111)
OKLCH	oklch(55.65% 0.113 279.1)
XYZ	xyz(18.9729, 16.6346, 45.3823)
Luminance	0.1663 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BB4 #B4AF66

analogous

#6692B4 #666BB4 #8866B4

triadic

#666BB4 #B4666B #6BB466

tetradic

#666BB4 #B46692 #B4AF66 #66B488

square

#666BB4 #B46692 #B4AF66 #66B488

split-complementary

#666BB4 #B48866 #92B466

monochromatic

#34386B #494D94 #666BB4 #8F93C8 #B8BADC

Accessibility & contrast

On white

4.85

#666BB4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.33

#666BB4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BB4

4.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BB4	#FFFFFF	#000000	##FFFFFF
##666BB4	1.00	4.85	4.33	4.85
#FFFFFF	4.85	1.00	21.00	1.00
#000000	4.33	21.00	1.00	21.00
##FFFFFF	4.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5174B7

Deuteranopia (green-blind)

#4B6FB2

Tritanopia (blue-blind)

#4D7A87

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #666bb4;
/* rgb */ color: rgb(102, 107, 180);
/* oklch */ color: oklch(55.7% 0.113 279.1);

Tailwind

colors: {
  custom: {
    50: '#9595cb',
    500: '#666bb4',
    950: '#000000',
  },
}

SCSS

$custom: #666bb4;
$custom-light: #9595cb;
$custom-dark: #000000;

JSON

{
  "hex": "#666bb4",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 180
  },
  "hsl": {
    "h": 236.154,
    "s": 34.211,
    "l": 55.294
  },
  "oklch": {
    "l": 0.55652,
    "c": 0.11253,
    "h": 279.1
  },
  "luminance": 0.16635
}

Semantic roles & 50–950 ramp

primary

#666BB4

secondary

#CBC9AB

accent

#C35ECA

background

#F9F9FC

surface

#F2F1F8

border

#CCCBD1

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666BB4

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

Preview Lab → · Contrast checker → · Palette generator →