#666FC3#666FC3

#666FC3 is a mid, vivid blue. Relative luminance 0.181; OKLCH L 57.3% C 0.129 H 276.9°. Best body text is #000000 at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#666FC3
RGB	rgb(102, 111, 195)
HSL	hsl(234, 44%, 58%)
HSV	hsv(234, 48%, 76%)
CMYK	cmyk(47.7%, 43.1%, 0%, 23.5%)
CIE-LAB	lab(49.66, 19.32, -45.12)
CIE-LCH	lch(49.66, 49.08, 293.18°)
OKLab	oklab(57.33% 0.0155 -0.1278)
OKLCH	oklch(57.33% 0.129 276.9)
XYZ	xyz(21.0112, 18.1326, 54.0120)
Luminance	0.1813 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FC3 #C3BA66

analogous

#669DC3 #666FC3 #8B66C3

triadic

#666FC3 #C3666F #6FC366

tetradic

#666FC3 #C3669D #C3BA66 #66C38B

square

#666FC3 #C3669D #C3BA66 #66C38B

split-complementary

#666FC3 #C38B66 #9DC366

monochromatic

#31397D #424CA9 #666FC3 #9298D4 #BEC2E5

Accessibility & contrast

On white

4.54

#666FC3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.63

#666FC3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FC3

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FC3	#FFFFFF	#000000	##000000
##666FC3	1.00	4.54	4.63	4.63
#FFFFFF	4.54	1.00	21.00	21.00
#000000	4.63	21.00	1.00	1.00
##000000	4.63	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E7AC6

Deuteranopia (green-blind)

#4673C1

Tritanopia (blue-blind)

#44818F

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #666fc3;
/* rgb */ color: rgb(102, 111, 195);
/* oklch */ color: oklch(57.3% 0.129 276.9);

Tailwind

colors: {
  custom: {
    50: '#9798d5',
    500: '#666fc3',
    950: '#000000',
  },
}

SCSS

$custom: #666fc3;
$custom-light: #9798d5;
$custom-dark: #000000;

JSON

{
  "hex": "#666fc3",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 195
  },
  "hsl": {
    "h": 234.194,
    "s": 43.662,
    "l": 58.235
  },
  "oklch": {
    "l": 0.57333,
    "c": 0.12874,
    "h": 276.9
  },
  "luminance": 0.18134
}

Semantic roles & 50–950 ramp

primary

#666FC3

secondary

#D5D1B0

accent

#C754D3

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0D14

muted

#7E7E83

Preview Lab

Preview with #666FC3

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

Preview Lab → · Contrast checker → · Palette generator →