#4039B9#4039B9

#4039B9 is a dark, vivid blue. Relative luminance 0.075; OKLCH L 44.0% C 0.193 H 277.3°. Best body text is #FFFFFF at 8.39:1 contrast (WCAG AA passes).

Color values

HEX	#4039B9
RGB	rgb(64, 57, 185)
HSL	hsl(243, 53%, 47%)
HSV	hsv(243, 69%, 73%)
CMYK	cmyk(65.4%, 69.2%, 0%, 27.5%)
CIE-LAB	lab(32.96, 42.10, -66.41)
CIE-LCH	lch(32.96, 78.63, 302.37°)
OKLab	oklab(43.99% 0.0246 -0.1917)
OKLCH	oklch(43.99% 0.193 277.3)
XYZ	xyz(12.3316, 7.5180, 46.6908)
Luminance	0.0752 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Ocean Blue

#4F42B5

ΔE00 3.00

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4039B9 #B2B939

analogous

#3972B9 #4039B9 #8039B9

triadic

#4039B9 #B94039 #39B940

tetradic

#4039B9 #B93972 #B2B939 #39B980

square

#4039B9 #B93972 #B2B939 #39B980

split-complementary

#4039B9 #B98039 #72B939

monochromatic

#201C5B #302B8A #4039B9 #6761CE #9490DD

Accessibility & contrast

On white

8.39

#4039B9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.50

#4039B9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #4039B9

8.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4039B9	#FFFFFF	#000000	##FFFFFF
##4039B9	1.00	8.39	2.50	8.39
#FFFFFF	8.39	1.00	21.00	1.00
#000000	2.50	21.00	1.00	21.00
##FFFFFF	8.39	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053BD

Deuteranopia (green-blind)

#0048B7

Tritanopia (blue-blind)

#005B74

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #4039b9;
/* rgb */ color: rgb(64, 57, 185);
/* oklch */ color: oklch(44.0% 0.193 277.3);

Tailwind

colors: {
  custom: {
    50: '#8471cf',
    500: '#4039b9',
    950: '#000000',
  },
}

SCSS

$custom: #4039b9;
$custom-light: #8471cf;
$custom-dark: #000000;

JSON

{
  "hex": "#4039b9",
  "rgb": {
    "r": 64,
    "g": 57,
    "b": 185
  },
  "hsl": {
    "h": 243.281,
    "s": 52.893,
    "l": 47.451
  },
  "oklch": {
    "l": 0.43985,
    "c": 0.19324,
    "h": 277.3
  },
  "luminance": 0.07519
}

Semantic roles & 50–950 ramp

primary

#4039B9

secondary

#C4C886

accent

#DC4BD4

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #4039B9

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

Preview Lab → · Contrast checker → · Palette generator →