#42478B#42478B

#42478B is a dark, moderate blue. Relative luminance 0.075; OKLCH L 42.9% C 0.111 H 277.5°. Best body text is #FFFFFF at 8.38:1 contrast (WCAG AA passes).

Color values

HEX	#42478B
RGB	rgb(66, 71, 139)
HSL	hsl(236, 36%, 40%)
HSV	hsv(236, 53%, 55%)
CMYK	cmyk(52.5%, 48.9%, 0%, 45.5%)
CIE-LAB	lab(32.98, 18.11, -38.66)
CIE-LCH	lch(32.98, 42.69, 295.10°)
OKLab	oklab(42.92% 0.0144 -0.11)
OKLCH	oklch(42.92% 0.111 277.5)
XYZ	xyz(9.1587, 7.5283, 25.3916)
Luminance	0.0753 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42478B #8B8642

analogous

#426C8B #42478B #61428B

triadic

#42478B #8B4247 #478B42

tetradic

#42478B #8B426C #8B8642 #428B61

square

#42478B #8B426C #8B8642 #428B61

split-complementary

#42478B #8B6142 #6C8B42

monochromatic

#1B1D38 #2E3262 #42478B #5A60B1 #8388C4

Accessibility & contrast

On white

8.38

#42478B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.51

#42478B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #42478B

8.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42478B	#FFFFFF	#000000	##FFFFFF
##42478B	1.00	8.38	2.51	8.38
#FFFFFF	8.38	1.00	21.00	1.00
#000000	2.51	21.00	1.00	21.00
##FFFFFF	8.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#29518D

Deuteranopia (green-blind)

#214B8A

Tritanopia (blue-blind)

#245662

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #42478b;
/* rgb */ color: rgb(66, 71, 139);
/* oklch */ color: oklch(42.9% 0.111 277.5);

Tailwind

colors: {
  custom: {
    50: '#7c7aad',
    500: '#42478b',
    950: '#000000',
  },
}

SCSS

$custom: #42478b;
$custom-light: #7c7aad;
$custom-dark: #000000;

JSON

{
  "hex": "#42478b",
  "rgb": {
    "r": 66,
    "g": 71,
    "b": 139
  },
  "hsl": {
    "h": 235.89,
    "s": 35.61,
    "l": 40.196
  },
  "oklch": {
    "l": 0.42924,
    "c": 0.11095,
    "h": 277.5
  },
  "luminance": 0.07529
}

Semantic roles & 50–950 ramp

primary

#42478B

secondary

#AFAB7A

accent

#C45CCC

background

#F7F7FA

surface

#EEEDF4

border

#C9C8CE

text

#0A0910

muted

#7C7B7F

Preview Lab

Preview with #42478B

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

Preview Lab → · Contrast checker → · Palette generator →