#151B4B#151B4B

#151B4B is a very dark, moderate blue. Relative luminance 0.015; OKLCH L 25.0% C 0.088 H 272.8°. Best body text is #FFFFFF at 16.28:1 contrast (WCAG AA passes).

Color values

HEX	#151B4B
RGB	rgb(21, 27, 75)
HSL	hsl(233, 56%, 19%)
HSV	hsv(233, 72%, 29%)
CMYK	cmyk(72%, 64%, 0%, 70.6%)
CIE-LAB	lab(12.29, 15.41, -30.69)
CIE-LCH	lch(12.29, 34.34, 296.66°)
OKLab	oklab(25% 0.0044 -0.0883)
OKLCH	oklch(25% 0.088 272.8)
XYZ	xyz(1.9708, 1.4511, 6.8315)
Luminance	0.0145 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Midnight Blue (survey)

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#151B4B #4B4515

analogous

#15364B #151B4B #2A154B

triadic

#151B4B #4B151B #1B4B15

tetradic

#151B4B #4B1536 #4B4515 #154B2A

square

#151B4B #4B1536 #4B4515 #154B2A

split-complementary

#151B4B #4B2A15 #364B15

monochromatic

#070918 #080A1B #151B4B #222C7B #303DAB

Accessibility & contrast

On white

16.28

#151B4B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.29

#151B4B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #151B4B

16.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##151B4B	#FFFFFF	#000000	##FFFFFF
##151B4B	1.00	16.28	1.29	16.28
#FFFFFF	16.28	1.00	21.00	1.00
#000000	1.29	21.00	1.00	21.00
##FFFFFF	16.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00234D

Deuteranopia (green-blind)

#001E4A

Tritanopia (blue-blind)

#002730

Achromatopsia (no color)

#202020

Design tokens & code

CSS

--color: #151b4b;
/* rgb */ color: rgb(21, 27, 75);
/* oklch */ color: oklch(25.0% 0.088 272.8);

Tailwind

colors: {
  custom: {
    50: '#5a577e',
    500: '#151b4b',
    950: '#000000',
  },
}

SCSS

$custom: #151b4b;
$custom-light: #5a577e;
$custom-dark: #000000;

JSON

{
  "hex": "#151b4b",
  "rgb": {
    "r": 21,
    "g": 27,
    "b": 75
  },
  "hsl": {
    "h": 233.333,
    "s": 56.25,
    "l": 18.824
  },
  "oklch": {
    "l": 0.24995,
    "c": 0.08842,
    "h": 272.8
  },
  "luminance": 0.01451
}

Semantic roles & 50–950 ramp

primary

#151B4B

secondary

#837B39

accent

#CF48E0

background

#F5F5F7

surface

#E9E9EE

border

#C5C5C9

text

#04030A

muted

#79787C

Preview Lab

Preview with #151B4B

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

Preview Lab → · Contrast checker → · Palette generator →