#151D4B#151D4B

#151D4B is a dark, moderate blue. Relative luminance 0.015; OKLCH L 25.4% C 0.085 H 271.5°. Best body text is #FFFFFF at 16.04:1 contrast (WCAG AA passes).

Color values

HEX	#151D4B
RGB	rgb(21, 29, 75)
HSL	hsl(231, 56%, 19%)
HSV	hsv(231, 72%, 29%)
CMYK	cmyk(72%, 61.3%, 0%, 70.6%)
CIE-LAB	lab(12.90, 13.90, -29.71)
CIE-LCH	lch(12.90, 32.80, 295.07°)
OKLab	oklab(25.45% 0.0023 -0.0854)
OKLCH	oklch(25.45% 0.085 271.5)
XYZ	xyz(2.0182, 1.5460, 6.8473)
Luminance	0.0155 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

#020035

ΔE00 6.60

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#151D4B #4B4315

analogous

#15384B #151D4B #28154B

triadic

#151D4B #4B151D #1D4B15

tetradic

#151D4B #4B1538 #4B4315 #154B28

square

#151D4B #4B1538 #4B4315 #154B28

split-complementary

#151D4B #4B2815 #384B15

monochromatic

#070918 #080B1B #151D4B #222F7B #3042AB

Accessibility & contrast

On white

16.04

#151D4B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.31

#151D4B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #151D4B

16.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##151D4B	#FFFFFF	#000000	##FFFFFF
##151D4B	1.00	16.04	1.31	16.04
#FFFFFF	16.04	1.00	21.00	1.00
#000000	1.31	21.00	1.00	21.00
##FFFFFF	16.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00244D

Deuteranopia (green-blind)

#001F4A

Tritanopia (blue-blind)

#002830

Achromatopsia (no color)

#212121

Design tokens & code

CSS

--color: #151d4b;
/* rgb */ color: rgb(21, 29, 75);
/* oklch */ color: oklch(25.4% 0.085 271.5);

Tailwind

colors: {
  custom: {
    50: '#5a587e',
    500: '#151d4b',
    950: '#000000',
  },
}

SCSS

$custom: #151d4b;
$custom-light: #5a587e;
$custom-dark: #000000;

JSON

{
  "hex": "#151d4b",
  "rgb": {
    "r": 21,
    "g": 29,
    "b": 75
  },
  "hsl": {
    "h": 231.111,
    "s": 56.25,
    "l": 18.824
  },
  "oklch": {
    "l": 0.25446,
    "c": 0.08544,
    "h": 271.5
  },
  "luminance": 0.01546
}

Semantic roles & 50–950 ramp

primary

#151D4B

secondary

#837839

accent

#C948E0

background

#F5F5F7

surface

#E9E9EE

border

#C5C5C9

text

#04030A

muted

#79787C

Preview Lab

Preview with #151D4B

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

Preview Lab → · Contrast checker → · Palette generator →