#666FD4#666FD4

#666FD4 is a mid, vivid blue. Relative luminance 0.189; OKLCH L 58.4% C 0.153 H 276.7°. Best body text is #000000 at 4.79:1 contrast (WCAG AA passes).

Color values

HEX	#666FD4
RGB	rgb(102, 111, 212)
HSL	hsl(235, 56%, 62%)
HSV	hsv(235, 52%, 83%)
CMYK	cmyk(51.9%, 47.6%, 0%, 16.9%)
CIE-LAB	lab(50.62, 24.60, -53.29)
CIE-LCH	lch(50.62, 58.70, 294.78°)
OKLab	oklab(58.38% 0.0179 -0.1518)
OKLCH	oklch(58.38% 0.153 276.7)
XYZ	xyz(23.0438, 18.9457, 64.7172)
Luminance	0.1895 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FD4 #D4CB66

analogous

#66A6D4 #666FD4 #9466D4

triadic

#666FD4 #D4666F #6FD466

tetradic

#666FD4 #D466A6 #D4CB66 #66D494

square

#666FD4 #D466A6 #D4CB66 #66D494

split-complementary

#666FD4 #D49466 #A6D466

monochromatic

#2A3396 #3743C5 #666FD4 #969CE1 #C6C9EF

Accessibility & contrast

On white

4.38

#666FD4 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.79

#666FD4 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FD4

4.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FD4	#FFFFFF	#000000	##000000
##666FD4	1.00	4.38	4.79	4.79
#FFFFFF	4.38	1.00	21.00	21.00
#000000	4.79	21.00	1.00	1.00
##000000	4.79	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#417DD8

Deuteranopia (green-blind)

#3574D2

Tritanopia (blue-blind)

#368597

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666fd4;
/* rgb */ color: rgb(102, 111, 212);
/* oklch */ color: oklch(58.4% 0.153 276.7);

Tailwind

colors: {
  custom: {
    50: '#9998e2',
    500: '#666fd4',
    950: '#000000',
  },
}

SCSS

$custom: #666fd4;
$custom-light: #9998e2;
$custom-dark: #000000;

JSON

{
  "hex": "#666fd4",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 212
  },
  "hsl": {
    "h": 235.091,
    "s": 56.122,
    "l": 61.569
  },
  "oklch": {
    "l": 0.58381,
    "c": 0.15281,
    "h": 276.7
  },
  "luminance": 0.18947
}

Semantic roles & 50–950 ramp

primary

#666FD4

secondary

#DFDCB6

accent

#B622C4

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666FD4

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

Preview Lab → · Contrast checker → · Palette generator →