#1B3151#1B3151

#1B3151 is a dark, moderate blue. Relative luminance 0.030; OKLCH L 31.2% C 0.064 H 257.7°. Best body text is #FFFFFF at 13.09:1 contrast (WCAG AA passes).

Color values

HEX	#1B3151
RGB	rgb(27, 49, 81)
HSL	hsl(216, 50%, 21%)
HSV	hsv(216, 67%, 32%)
CMYK	cmyk(66.7%, 39.5%, 0%, 68.2%)
CIE-LAB	lab(20.14, 2.86, -22.18)
CIE-LCH	lch(20.14, 22.36, 277.35°)
OKLab	oklab(31.22% -0.0136 -0.0628)
OKLCH	oklch(31.22% 0.064 257.7)
XYZ	xyz(3.0350, 3.0234, 8.2066)
Luminance	0.0302 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3151 #513B1B

analogous

#1B4C51 #1B3151 #201B51

triadic

#1B3151 #511B31 #31511B

tetradic

#1B3151 #511B4C #513B1B #1B5120

square

#1B3151 #511B4C #513B1B #1B5120

split-complementary

#1B3151 #51201B #4C511B

monochromatic

#080E17 #0C1523 #1B3151 #2A4D7F #3A69AD

Accessibility & contrast

On white

13.09

#1B3151 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.60

#1B3151 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3151

13.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3151	#FFFFFF	#000000	##FFFFFF
##1B3151	1.00	13.09	1.60	13.09
#FFFFFF	13.09	1.00	21.00	1.00
#000000	1.60	21.00	1.00	21.00
##FFFFFF	13.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#233352

Deuteranopia (green-blind)

#1C2E50

Tritanopia (blue-blind)

#00383D

Achromatopsia (no color)

#313131

Design tokens & code

CSS

--color: #1b3151;
/* rgb */ color: rgb(27, 49, 81);
/* oklch */ color: oklch(31.2% 0.064 257.7);

Tailwind

colors: {
  custom: {
    50: '#5d6882',
    500: '#1b3151',
    950: '#000000',
  },
}

SCSS

$custom: #1b3151;
$custom-light: #5d6882;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3151",
  "rgb": {
    "r": 27,
    "g": 49,
    "b": 81
  },
  "hsl": {
    "h": 215.556,
    "s": 50,
    "l": 21.176
  },
  "oklch": {
    "l": 0.31224,
    "c": 0.06432,
    "h": 257.7
  },
  "luminance": 0.03024
}

Semantic roles & 50–950 ramp

primary

#1B3151

secondary

#876A41

accent

#A14EDA

background

#F5F6F7

surface

#E9EBEE

border

#C5C6C9

text

#04060A

muted

#797A7C

Preview Lab

Preview with #1B3151

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

Preview Lab → · Contrast checker → · Palette generator →