#4039BB#4039BB

#4039BB is a dark, vivid blue. Relative luminance 0.076; OKLCH L 44.2% C 0.196 H 277.1°. Best body text is #FFFFFF at 8.33:1 contrast (WCAG AA passes).

Color values

HEX	#4039BB
RGB	rgb(64, 57, 187)
HSL	hsl(243, 53%, 48%)
HSV	hsv(243, 70%, 73%)
CMYK	cmyk(65.8%, 69.5%, 0%, 26.7%)
CIE-LAB	lab(33.14, 42.75, -67.29)
CIE-LCH	lch(33.14, 79.72, 302.43°)
OKLab	oklab(44.17% 0.0243 -0.1942)
OKLCH	oklch(44.17% 0.196 277.1)
XYZ	xyz(12.5442, 7.6030, 47.8105)
Luminance	0.0760 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Ocean Blue

#4F42B5

ΔE00 3.04

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4039BB #B4BB39

analogous

#3973BB #4039BB #8139BB

triadic

#4039BB #BB4039 #39BB40

tetradic

#4039BB #BB3973 #B4BB39 #39BB81

square

#4039BB #BB3973 #B4BB39 #39BB81

split-complementary

#4039BB #BB8139 #73BB39

monochromatic

#201C5D #302B8C #4039BB #6862CF #9591DD

Accessibility & contrast

On white

8.33

#4039BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.52

#4039BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #4039BB

8.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4039BB	#FFFFFF	#000000	##FFFFFF
##4039BB	1.00	8.33	2.52	8.33
#FFFFFF	8.33	1.00	21.00	1.00
#000000	2.52	21.00	1.00	21.00
##FFFFFF	8.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053BF

Deuteranopia (green-blind)

#0048B9

Tritanopia (blue-blind)

#005C76

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #4039bb;
/* rgb */ color: rgb(64, 57, 187);
/* oklch */ color: oklch(44.2% 0.196 277.1);

Tailwind

colors: {
  custom: {
    50: '#8471d1',
    500: '#4039bb',
    950: '#000000',
  },
}

SCSS

$custom: #4039bb;
$custom-light: #8471d1;
$custom-dark: #000000;

JSON

{
  "hex": "#4039bb",
  "rgb": {
    "r": 64,
    "g": 57,
    "b": 187
  },
  "hsl": {
    "h": 243.231,
    "s": 53.279,
    "l": 47.843
  },
  "oklch": {
    "l": 0.44174,
    "c": 0.19575,
    "h": 277.1
  },
  "luminance": 0.07604
}

Semantic roles & 50–950 ramp

primary

#4039BB

secondary

#C5C887

accent

#DD4BD5

background

#F8F6FD

surface

#F0ECFA

border

#CBC7D3

text

#0C0814

muted

#7D7B83

Preview Lab

Preview with #4039BB

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

Preview Lab → · Contrast checker → · Palette generator →