#040A2F#040A2F

#040A2F is a very dark, moderate blue. Relative luminance 0.004; OKLCH L 17.0% C 0.074 H 268.0°. Best body text is #FFFFFF at 19.27:1 contrast (WCAG AA passes).

Color values

HEX	#040A2F
RGB	rgb(4, 10, 47)
HSL	hsl(232, 84%, 10%)
HSV	hsv(232, 91%, 18%)
CMYK	cmyk(91.5%, 78.7%, 0%, 81.6%)
CIE-LAB	lab(4.05, 10.06, -24.04)
CIE-LCH	lch(4.05, 26.06, 292.71°)
OKLab	oklab(17.02% -0.0026 -0.0742)
OKLCH	oklch(17.02% 0.074 268)
XYZ	xyz(0.6715, 0.4481, 2.7399)
Luminance	0.0045 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 3.83

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#040A2F #2F2904

analogous

#041F2F #040A2F #14042F

triadic

#040A2F #2F040A #0A2F04

tetradic

#040A2F #2F041F #2F2904 #042F14

square

#040A2F #2F041F #2F2904 #042F14

split-complementary

#040A2F #2F1404 #1F2F04

monochromatic

#02061C #02061C #040A2F #091667 #0E22A0

Accessibility & contrast

On white

19.27

#040A2F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.09

#040A2F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #040A2F

19.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##040A2F	#FFFFFF	#000000	##FFFFFF
##040A2F	1.00	19.27	1.09	19.27
#FFFFFF	19.27	1.00	21.00	1.00
#000000	1.09	21.00	1.00	21.00
##FFFFFF	19.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#001030

Deuteranopia (green-blind)

#000C2E

Tritanopia (blue-blind)

#00141B

Achromatopsia (no color)

#0E0E0E

Design tokens & code

CSS

--color: #040a2f;
/* rgb */ color: rgb(4, 10, 47);
/* oklch */ color: oklch(17.0% 0.074 268.0);

Tailwind

colors: {
  custom: {
    50: '#4a4b68',
    500: '#040a2f',
    950: '#000000',
  },
}

SCSS

$custom: #040a2f;
$custom-light: #4a4b68;
$custom-dark: #000000;

JSON

{
  "hex": "#040a2f",
  "rgb": {
    "r": 4,
    "g": 10,
    "b": 47
  },
  "hsl": {
    "h": 231.628,
    "s": 84.314,
    "l": 10
  },
  "oklch": {
    "l": 0.17017,
    "c": 0.07425,
    "h": 268
  },
  "luminance": 0.00448
}

Semantic roles & 50–950 ramp

primary

#040A2F

secondary

#72661D

accent

#DE2DFB

background

#F4F4F6

surface

#E7E7EB

border

#C3C3C6

text

#010106

muted

#77777A

Preview Lab

Preview with #040A2F

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

Preview Lab → · Contrast checker → · Palette generator →