#42378F#42378F

#42378F is a dark, vivid blue. Relative luminance 0.059; OKLCH L 40.1% C 0.140 H 283.8°. Best body text is #FFFFFF at 9.66:1 contrast (WCAG AA passes).

Color values

HEX	#42378F
RGB	rgb(66, 55, 143)
HSL	hsl(248, 44%, 39%)
HSV	hsv(248, 62%, 56%)
CMYK	cmyk(53.8%, 61.5%, 0%, 43.9%)
CIE-LAB	lab(29.09, 29.85, -47.38)
CIE-LCH	lch(29.09, 56.00, 302.21°)
OKLab	oklab(40.11% 0.0334 -0.1358)
OKLCH	oklch(40.11% 0.14 283.8)
XYZ	xyz(8.5694, 5.8733, 26.6634)
Luminance	0.0587 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42378F #848F37

analogous

#37588F #42378F #6E378F

triadic

#42378F #8F4237 #378F42

tetradic

#42378F #8F3758 #848F37 #378F6E

square

#42378F #8F3758 #848F37 #378F6E

split-complementary

#42378F #8F6E37 #588F37

monochromatic

#191537 #2E2663 #42378F #584AB9 #8176CA

Accessibility & contrast

On white

9.66

#42378F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.17

#42378F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #42378F

9.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42378F	#FFFFFF	#000000	##FFFFFF
##42378F	1.00	9.66	2.17	9.66
#FFFFFF	9.66	1.00	21.00	1.00
#000000	2.17	21.00	1.00	21.00
##FFFFFF	9.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004792

Deuteranopia (green-blind)

#00428D

Tritanopia (blue-blind)

#224C5D

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #42378f;
/* rgb */ color: rgb(66, 55, 143);
/* oklch */ color: oklch(40.1% 0.140 283.8);

Tailwind

colors: {
  custom: {
    50: '#7d6eb0',
    500: '#42378f',
    950: '#000000',
  },
}

SCSS

$custom: #42378f;
$custom-light: #7d6eb0;
$custom-dark: #000000;

JSON

{
  "hex": "#42378f",
  "rgb": {
    "r": 66,
    "g": 55,
    "b": 143
  },
  "hsl": {
    "h": 247.5,
    "s": 44.444,
    "l": 38.824
  },
  "oklch": {
    "l": 0.40111,
    "c": 0.13983,
    "h": 283.8
  },
  "luminance": 0.05874
}

Semantic roles & 50–950 ramp

primary

#42378F

secondary

#ABB36F

accent

#D454C4

background

#F8F6FA

surface

#EFECF5

border

#CAC7CF

text

#0A0711

muted

#7C7A80

Preview Lab

Preview with #42378F

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

Preview Lab → · Contrast checker → · Palette generator →