#666EC8#666EC8

#666EC8 is a mid, vivid blue. Relative luminance 0.181; OKLCH L 57.4% C 0.137 H 277.3°. Best body text is #000000 at 4.63:1 contrast (WCAG AA passes).

Color values

HEX	#666EC8
RGB	rgb(102, 110, 200)
HSL	hsl(235, 47%, 59%)
HSV	hsv(235, 49%, 78%)
CMYK	cmyk(49%, 45%, 0%, 21.6%)
CIE-LAB	lab(49.67, 21.48, -47.96)
CIE-LCH	lch(49.67, 52.55, 294.12°)
OKLab	oklab(57.44% 0.0175 -0.1361)
OKLCH	oklch(57.44% 0.137 277.3)
XYZ	xyz(21.4775, 18.1456, 57.0031)
Luminance	0.1815 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666EC8 #C8C066

analogous

#669FC8 #666EC8 #8F66C8

triadic

#666EC8 #C8666E #6EC866

tetradic

#666EC8 #C8669F #C8C066 #66C88F

square

#666EC8 #C8669F #C8C066 #66C88F

split-complementary

#666EC8 #C88F66 #9FC866

monochromatic

#2F3684 #4049B1 #666EC8 #9399D8 #C0C3E8

Accessibility & contrast

On white

4.54

#666EC8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.63

#666EC8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666EC8

4.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666EC8	#FFFFFF	#000000	##000000
##666EC8	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)

#497ACB

Deuteranopia (green-blind)

#4072C6

Tritanopia (blue-blind)

#408191

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #666ec8;
/* rgb */ color: rgb(102, 110, 200);
/* oklch */ color: oklch(57.4% 0.137 277.3);

Tailwind

colors: {
  custom: {
    50: '#9797d9',
    500: '#666ec8',
    950: '#000000',
  },
}

SCSS

$custom: #666ec8;
$custom-light: #9797d9;
$custom-dark: #000000;

JSON

{
  "hex": "#666ec8",
  "rgb": {
    "r": 102,
    "g": 110,
    "b": 200
  },
  "hsl": {
    "h": 235.102,
    "s": 47.115,
    "l": 59.216
  },
  "oklch": {
    "l": 0.57435,
    "c": 0.13725,
    "h": 277.3
  },
  "luminance": 0.18147
}

Semantic roles & 50–950 ramp

primary

#666EC8

secondary

#D8D5B2

accent

#CC51D7

background

#F9F9FD

surface

#F2F2FA

border

#CCCCD3

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666EC8

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

Preview Lab → · Contrast checker → · Palette generator →