#1B3370#1B3370

#1B3370 is a dark, moderate blue. Relative luminance 0.038; OKLCH L 34.0% C 0.110 H 264.9°. Best body text is #FFFFFF at 11.97:1 contrast (WCAG AA passes).

Color values

HEX	#1B3370
RGB	rgb(27, 51, 112)
HSL	hsl(223, 61%, 27%)
HSV	hsv(223, 76%, 44%)
CMYK	cmyk(75.9%, 54.5%, 0%, 56.1%)
CIE-LAB	lab(22.90, 14.02, -38.07)
CIE-LCH	lch(22.90, 40.57, 290.22°)
OKLab	oklab(34.03% -0.0097 -0.1095)
OKLCH	oklch(34.03% 0.11 264.9)
XYZ	xyz(4.5594, 3.7700, 15.8135)
Luminance	0.0377 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3370 #70581B

analogous

#1B5E70 #1B3370 #2E1B70

triadic

#1B3370 #701B33 #33701B

tetradic

#1B3370 #701B5E #70581B #1B702E

square

#1B3370 #701B5E #70581B #1B702E

split-complementary

#1B3370 #702E1B #5E701B

monochromatic

#060B19 #0F1D3F #1B3370 #2749A1 #3762CF

Accessibility & contrast

On white

11.97

#1B3370 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.75

#1B3370 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3370

11.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3370	#FFFFFF	#000000	##FFFFFF
##1B3370	1.00	11.97	1.75	11.97
#FFFFFF	11.97	1.00	21.00	1.00
#000000	1.75	21.00	1.00	21.00
##FFFFFF	11.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0B3B72

Deuteranopia (green-blind)

#00336F

Tritanopia (blue-blind)

#00424C

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1b3370;
/* rgb */ color: rgb(27, 51, 112);
/* oklch */ color: oklch(34.0% 0.110 264.9);

Tailwind

colors: {
  custom: {
    50: '#646a9a',
    500: '#1b3370',
    950: '#000000',
  },
}

SCSS

$custom: #1b3370;
$custom-light: #646a9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3370",
  "rgb": {
    "r": 27,
    "g": 51,
    "b": 112
  },
  "hsl": {
    "h": 223.059,
    "s": 61.151,
    "l": 27.255
  },
  "oklch": {
    "l": 0.3403,
    "c": 0.10991,
    "h": 264.9
  },
  "luminance": 0.03771
}

Semantic roles & 50–950 ramp

primary

#1B3370

secondary

#A58942

accent

#B744E4

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1B3370

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

Preview Lab → · Contrast checker → · Palette generator →