#666BB1#666BB1

#666BB1 is a mid, moderate blue. Relative luminance 0.165; OKLCH L 55.5% C 0.108 H 279.1°. Best body text is #FFFFFF at 4.88:1 contrast (WCAG AA passes).

Color values

HEX	#666BB1
RGB	rgb(102, 107, 177)
HSL	hsl(236, 32%, 55%)
HSV	hsv(236, 42%, 69%)
CMYK	cmyk(42.4%, 39.5%, 0%, 30.6%)
CIE-LAB	lab(47.64, 16.34, -37.90)
CIE-LCH	lch(47.64, 41.27, 293.32°)
OKLab	oklab(55.48% 0.0172 -0.1067)
OKLCH	oklch(55.48% 0.108 279.1)
XYZ	xyz(18.6706, 16.5137, 43.7901)
Luminance	0.1651 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BB1 #B1AC66

analogous

#6691B1 #666BB1 #8766B1

triadic

#666BB1 #B1666B #6BB166

tetradic

#666BB1 #B16691 #B1AC66 #66B187

square

#666BB1 #B16691 #B1AC66 #66B187

split-complementary

#666BB1 #B18766 #91B166

monochromatic

#353868 #4A4E90 #666BB1 #8F92C6 #B7B9DA

Accessibility & contrast

On white

4.88

#666BB1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.30

#666BB1 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BB1

4.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BB1	#FFFFFF	#000000	##FFFFFF
##666BB1	1.00	4.88	4.30	4.88
#FFFFFF	4.88	1.00	21.00	1.00
#000000	4.30	21.00	1.00	21.00
##FFFFFF	4.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5274B4

Deuteranopia (green-blind)

#4D6EAF

Tritanopia (blue-blind)

#4E7985

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #666bb1;
/* rgb */ color: rgb(102, 107, 177);
/* oklch */ color: oklch(55.5% 0.108 279.1);

Tailwind

colors: {
  custom: {
    50: '#9595c8',
    500: '#666bb1',
    950: '#000000',
  },
}

SCSS

$custom: #666bb1;
$custom-light: #9595c8;
$custom-dark: #000000;

JSON

{
  "hex": "#666bb1",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 177
  },
  "hsl": {
    "h": 236,
    "s": 32.468,
    "l": 54.706
  },
  "oklch": {
    "l": 0.55483,
    "c": 0.1081,
    "h": 279.1
  },
  "luminance": 0.16514
}

Semantic roles & 50–950 ramp

primary

#666BB1

secondary

#C9C7AA

accent

#C25FC9

background

#F9F9FC

surface

#F2F1F8

border

#CCCBD1

text

#0D0D13

muted

#7E7E82

Preview Lab

Preview with #666BB1

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

Preview Lab → · Contrast checker → · Palette generator →