#666BB5#666BB5

#666BB5 is a mid, moderate blue. Relative luminance 0.167; OKLCH L 55.7% C 0.114 H 279.1°. Best body text is #FFFFFF at 4.84:1 contrast (WCAG AA passes).

Color values

HEX	#666BB5
RGB	rgb(102, 107, 181)
HSL	hsl(236, 35%, 55%)
HSV	hsv(236, 44%, 71%)
CMYK	cmyk(43.6%, 40.9%, 0%, 29%)
CIE-LAB	lab(47.85, 17.53, -39.90)
CIE-LCH	lch(47.85, 43.58, 293.72°)
OKLab	oklab(55.71% 0.018 -0.1126)
OKLCH	oklch(55.71% 0.114 279.1)
XYZ	xyz(19.0752, 16.6755, 45.9207)
Luminance	0.1668 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BB5 #B5B066

analogous

#6692B5 #666BB5 #8966B5

triadic

#666BB5 #B5666B #6BB566

tetradic

#666BB5 #B56692 #B5B066 #66B589

square

#666BB5 #B56692 #B5B066 #66B589

split-complementary

#666BB5 #B58966 #92B566

monochromatic

#34386C #484D95 #666BB5 #8F93C9 #B8BBDD

Accessibility & contrast

On white

4.84

#666BB5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.34

#666BB5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BB5

4.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BB5	#FFFFFF	#000000	##FFFFFF
##666BB5	1.00	4.84	4.34	4.84
#FFFFFF	4.84	1.00	21.00	1.00
#000000	4.34	21.00	1.00	21.00
##FFFFFF	4.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5075B8

Deuteranopia (green-blind)

#4B6FB3

Tritanopia (blue-blind)

#4C7A87

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #666bb5;
/* rgb */ color: rgb(102, 107, 181);
/* oklch */ color: oklch(55.7% 0.114 279.1);

Tailwind

colors: {
  custom: {
    50: '#9595cb',
    500: '#666bb5',
    950: '#000000',
  },
}

SCSS

$custom: #666bb5;
$custom-light: #9595cb;
$custom-dark: #000000;

JSON

{
  "hex": "#666bb5",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 181
  },
  "hsl": {
    "h": 236.203,
    "s": 34.802,
    "l": 55.49
  },
  "oklch": {
    "l": 0.55709,
    "c": 0.11399,
    "h": 279.1
  },
  "luminance": 0.16676
}

Semantic roles & 50–950 ramp

primary

#666BB5

secondary

#CCCAAB

accent

#C45DCB

background

#F9F9FC

surface

#F2F1F8

border

#CCCBD1

text

#0E0D13

muted

#7E7E82

Preview Lab

Preview with #666BB5

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

Preview Lab → · Contrast checker → · Palette generator →