#666FD3#666FD3

#666FD3 is a mid, vivid blue. Relative luminance 0.189; OKLCH L 58.3% C 0.151 H 276.8°. Best body text is #000000 at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#666FD3
RGB	rgb(102, 111, 211)
HSL	hsl(235, 55%, 61%)
HSV	hsv(235, 52%, 83%)
CMYK	cmyk(51.7%, 47.4%, 0%, 17.3%)
CIE-LAB	lab(50.56, 24.29, -52.82)
CIE-LCH	lch(50.56, 58.13, 294.70°)
OKLab	oklab(58.32% 0.0178 -0.1504)
OKLCH	oklch(58.32% 0.151 276.8)
XYZ	xyz(22.9181, 18.8954, 64.0549)
Luminance	0.1890 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FD3 #D3CA66

analogous

#66A6D3 #666FD3 #9466D3

triadic

#666FD3 #D3666F #6FD366

tetradic

#666FD3 #D366A6 #D3CA66 #66D394

square

#666FD3 #D366A6 #D3CA66 #66D394

split-complementary

#666FD3 #D39466 #A6D366

monochromatic

#2B3394 #3844C4 #666FD3 #969CE1 #C5C8EE

Accessibility & contrast

On white

4.39

#666FD3 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.78

#666FD3 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FD3

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FD3	#FFFFFF	#000000	##000000
##666FD3	1.00	4.39	4.78	4.78
#FFFFFF	4.39	1.00	21.00	21.00
#000000	4.78	21.00	1.00	1.00
##000000	4.78	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#427DD7

Deuteranopia (green-blind)

#3674D1

Tritanopia (blue-blind)

#378597

Achromatopsia (no color)

#787878

Design tokens & code

CSS

--color: #666fd3;
/* rgb */ color: rgb(102, 111, 211);
/* oklch */ color: oklch(58.3% 0.151 276.8);

Tailwind

colors: {
  custom: {
    50: '#9998e1',
    500: '#666fd3',
    950: '#000000',
  },
}

SCSS

$custom: #666fd3;
$custom-light: #9998e1;
$custom-dark: #000000;

JSON

{
  "hex": "#666fd3",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 211
  },
  "hsl": {
    "h": 235.046,
    "s": 55.33,
    "l": 61.373
  },
  "oklch": {
    "l": 0.58318,
    "c": 0.15141,
    "h": 276.8
  },
  "luminance": 0.18897
}

Semantic roles & 50–950 ramp

primary

#666FD3

secondary

#DFDBB6

accent

#B623C3

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666FD3

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

Preview Lab → · Contrast checker → · Palette generator →