#1B283F#1B283F

#1B283F is a dark, muted blue. Relative luminance 0.021; OKLCH L 27.7% C 0.046 H 261.3°. Best body text is #FFFFFF at 14.77:1 contrast (WCAG AA passes).

Color values

HEX	#1B283F
RGB	rgb(27, 40, 63)
HSL	hsl(218, 40%, 18%)
HSV	hsv(218, 57%, 25%)
CMYK	cmyk(57.1%, 36.5%, 0%, 75.3%)
CIE-LAB	lab(16.05, 2.32, -16.35)
CIE-LCH	lch(16.05, 16.51, 278.09°)
OKLab	oklab(27.7% -0.007 -0.046)
OKLCH	oklch(27.7% 0.046 261.3)
XYZ	xyz(2.1077, 2.1093, 4.9977)
Luminance	0.0211 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B283F #3F321B

analogous

#1B3A3F #1B283F #201B3F

triadic

#1B283F #3F1B28 #283F1B

tetradic

#1B283F #3F1B3A #3F321B #1B3F20

square

#1B283F #3F1B3A #3F321B #1B3F20

split-complementary

#1B283F #3F201B #3A3F1B

monochromatic

#090E15 #090E15 #1B283F #2D436A #405E95

Accessibility & contrast

On white

14.77

#1B283F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.42

#1B283F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B283F

14.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B283F	#FFFFFF	#000000	##FFFFFF
##1B283F	1.00	14.77	1.42	14.77
#FFFFFF	14.77	1.00	21.00	1.00
#000000	1.42	21.00	1.00	21.00
##FFFFFF	14.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F2A40

Deuteranopia (green-blind)

#1B263F

Tritanopia (blue-blind)

#0B2D30

Achromatopsia (no color)

#282828

Design tokens & code

CSS

--color: #1b283f;
/* rgb */ color: rgb(27, 40, 63);
/* oklch */ color: oklch(27.7% 0.046 261.3);

Tailwind

colors: {
  custom: {
    50: '#5a6174',
    500: '#1b283f',
    950: '#000000',
  },
}

SCSS

$custom: #1b283f;
$custom-light: #5a6174;
$custom-dark: #000000;

JSON

{
  "hex": "#1b283f",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 63
  },
  "hsl": {
    "h": 218.333,
    "s": 40,
    "l": 17.647
  },
  "oklch": {
    "l": 0.27697,
    "c": 0.04649,
    "h": 261.3
  },
  "luminance": 0.02109
}

Semantic roles & 50–950 ramp

primary

#1B283F

secondary

#746241

accent

#A558D0

background

#F5F5F7

surface

#E9E9ED

border

#C5C5C8

text

#040508

muted

#79797B

Preview Lab

Preview with #1B283F

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

Preview Lab → · Contrast checker → · Palette generator →