#666BC3#666BC3

#666BC3 is a mid, vivid blue. Relative luminance 0.173; OKLCH L 56.5% C 0.134 H 278.7°. Best body text is #FFFFFF at 4.71:1 contrast (WCAG AA passes).

Color values

HEX	#666BC3
RGB	rgb(102, 107, 195)
HSL	hsl(237, 44%, 58%)
HSV	hsv(237, 48%, 76%)
CMYK	cmyk(47.7%, 45.1%, 0%, 23.5%)
CIE-LAB	lab(48.61, 21.77, -46.79)
CIE-LCH	lch(48.61, 51.60, 294.96°)
OKLab	oklab(56.54% 0.0204 -0.1327)
OKLCH	oklch(56.54% 0.134 278.7)
XYZ	xyz(20.5845, 17.2792, 53.8698)
Luminance	0.1728 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666BC3 #C3BE66

analogous

#6699C3 #666BC3 #8F66C3

triadic

#666BC3 #C3666B #6BC366

tetradic

#666BC3 #C36699 #C3BE66 #66C38F

square

#666BC3 #C36699 #C3BE66 #66C38F

split-complementary

#666BC3 #C38F66 #99C366

monochromatic

#31357D #4248A9 #666BC3 #9296D4 #BEC0E5

Accessibility & contrast

On white

4.71

#666BC3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.46

#666BC3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #666BC3

4.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666BC3	#FFFFFF	#000000	##FFFFFF
##666BC3	1.00	4.71	4.46	4.71
#FFFFFF	4.71	1.00	21.00	1.00
#000000	4.46	21.00	1.00	21.00
##FFFFFF	4.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4777C6

Deuteranopia (green-blind)

#4070C1

Tritanopia (blue-blind)

#447E8D

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #666bc3;
/* rgb */ color: rgb(102, 107, 195);
/* oklch */ color: oklch(56.5% 0.134 278.7);

Tailwind

colors: {
  custom: {
    50: '#9795d5',
    500: '#666bc3',
    950: '#000000',
  },
}

SCSS

$custom: #666bc3;
$custom-light: #9795d5;
$custom-dark: #000000;

JSON

{
  "hex": "#666bc3",
  "rgb": {
    "r": 102,
    "g": 107,
    "b": 195
  },
  "hsl": {
    "h": 236.774,
    "s": 43.662,
    "l": 58.235
  },
  "oklch": {
    "l": 0.56537,
    "c": 0.13425,
    "h": 278.7
  },
  "luminance": 0.1728
}

Semantic roles & 50–950 ramp

primary

#666BC3

secondary

#D5D3B0

accent

#CD54D3

background

#F9F9FD

surface

#F2F1FA

border

#CCCBD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666BC3

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

Preview Lab → · Contrast checker → · Palette generator →