#42579C#42579C

#42579C is a mid, moderate blue. Relative luminance 0.104; OKLCH L 47.5% C 0.114 H 269.0°. Best body text is #FFFFFF at 6.83:1 contrast (WCAG AA passes).

Color values

HEX	#42579C
RGB	rgb(66, 87, 156)
HSL	hsl(226, 41%, 44%)
HSV	hsv(226, 58%, 61%)
CMYK	cmyk(57.7%, 44.2%, 0%, 38.8%)
CIE-LAB	lab(38.51, 13.46, -40.14)
CIE-LCH	lch(38.51, 42.34, 288.53°)
OKLab	oklab(47.47% -0.002 -0.1142)
OKLCH	oklch(47.47% 0.114 269)
XYZ	xyz(11.6537, 10.3741, 32.8343)
Luminance	0.1037 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42579C #9C8742

analogous

#42849C #42579C #5A429C

triadic

#42579C #9C4257 #579C42

tetradic

#42579C #9C4284 #9C8742 #429C5A

square

#42579C #9C4284 #9C8742 #429C5A

split-complementary

#42579C #9C5A42 #849C42

monochromatic

#1E2746 #303F71 #42579C #6075BC #8B9ACE

Accessibility & contrast

On white

6.83

#42579C on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#42579C on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #42579C

6.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42579C	#FFFFFF	#000000	##FFFFFF
##42579C	1.00	6.83	3.08	6.83
#FFFFFF	6.83	1.00	21.00	1.00
#000000	3.08	21.00	1.00	21.00
##FFFFFF	6.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#395F9F

Deuteranopia (green-blind)

#2D579B

Tritanopia (blue-blind)

#056672

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #42579c;
/* rgb */ color: rgb(66, 87, 156);
/* oklch */ color: oklch(47.5% 0.114 269.0);

Tailwind

colors: {
  custom: {
    50: '#7e86b9',
    500: '#42579c',
    950: '#000000',
  },
}

SCSS

$custom: #42579c;
$custom-light: #7e86b9;
$custom-dark: #000000;

JSON

{
  "hex": "#42579c",
  "rgb": {
    "r": 66,
    "g": 87,
    "b": 156
  },
  "hsl": {
    "h": 226,
    "s": 40.541,
    "l": 43.529
  },
  "oklch": {
    "l": 0.4747,
    "c": 0.11424,
    "h": 269
  },
  "luminance": 0.10375
}

Semantic roles & 50–950 ramp

primary

#42579C

secondary

#B9AC81

accent

#B457D0

background

#F8F8FB

surface

#EFEFF6

border

#CACAD0

text

#0A0B11

muted

#7C7C80

Preview Lab

Preview with #42579C

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

Preview Lab → · Contrast checker → · Palette generator →