#42579B#42579B

#42579B is a mid, moderate blue. Relative luminance 0.103; OKLCH L 47.4% C 0.113 H 268.9°. Best body text is #FFFFFF at 6.84:1 contrast (WCAG AA passes).

Color values

HEX	#42579B
RGB	rgb(66, 87, 155)
HSL	hsl(226, 40%, 43%)
HSV	hsv(226, 57%, 61%)
CMYK	cmyk(57.4%, 43.9%, 0%, 39.2%)
CIE-LAB	lab(38.45, 13.11, -39.64)
CIE-LCH	lch(38.45, 41.75, 288.31°)
OKLab	oklab(47.41% -0.0022 -0.1127)
OKLCH	oklch(47.41% 0.113 268.9)
XYZ	xyz(11.5694, 10.3403, 32.3902)
Luminance	0.1034 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42579B #9B8642

analogous

#42839B #42579B #5A429B

triadic

#42579B #9B4257 #579B42

tetradic

#42579B #9B4283 #9B8642 #429B5A

square

#42579B #9B4283 #9B8642 #429B5A

split-complementary

#42579B #9B5A42 #839B42

monochromatic

#1D2745 #303F70 #42579B #5F75BB #8A9ACD

Accessibility & contrast

On white

6.84

#42579B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.07

#42579B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #42579B

6.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42579B	#FFFFFF	#000000	##FFFFFF
##42579B	1.00	6.84	3.07	6.84
#FFFFFF	6.84	1.00	21.00	1.00
#000000	3.07	21.00	1.00	21.00
##FFFFFF	6.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#395F9E

Deuteranopia (green-blind)

#2E579A

Tritanopia (blue-blind)

#086671

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #42579b;
/* rgb */ color: rgb(66, 87, 155);
/* oklch */ color: oklch(47.4% 0.113 268.9);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#42579b",
  "rgb": {
    "r": 66,
    "g": 87,
    "b": 155
  },
  "hsl": {
    "h": 225.843,
    "s": 40.271,
    "l": 43.333
  },
  "oklch": {
    "l": 0.47406,
    "c": 0.11276,
    "h": 268.9
  },
  "luminance": 0.10341
}

Semantic roles & 50–950 ramp

primary

#42579B

secondary

#B8AB81

accent

#B458D0

background

#F8F8FB

surface

#EFEFF6

border

#CACAD0

text

#0A0B11

muted

#7C7C80

Preview Lab

Preview with #42579B

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

Preview Lab → · Contrast checker → · Palette generator →