#1B3563#1B3563

#1B3563 is a dark, moderate blue. Relative luminance 0.037; OKLCH L 33.5% C 0.087 H 260.9°. Best body text is #FFFFFF at 12.10:1 contrast (WCAG AA passes).

Color values

HEX	#1B3563
RGB	rgb(27, 53, 99)
HSL	hsl(218, 57%, 25%)
HSV	hsv(218, 73%, 39%)
CMYK	cmyk(72.7%, 46.5%, 0%, 61.2%)
CIE-LAB	lab(22.58, 7.27, -30.17)
CIE-LCH	lch(22.58, 31.03, 283.55°)
OKLab	oklab(33.49% -0.0138 -0.0862)
OKLCH	oklch(33.49% 0.087 260.9)
XYZ	xyz(3.9764, 3.6797, 12.3026)
Luminance	0.0368 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3563 #63491B

analogous

#1B5963 #1B3563 #251B63

triadic

#1B3563 #631B35 #35631B

tetradic

#1B3563 #631B59 #63491B #1B6325

square

#1B3563 #631B59 #63491B #1B6325

split-complementary

#1B3563 #63251B #59631B

monochromatic

#070D18 #0E1B33 #1B3563 #284F93 #3568C3

Accessibility & contrast

On white

12.10

#1B3563 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.74

#1B3563 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3563

12.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3563	#FFFFFF	#000000	##FFFFFF
##1B3563	1.00	12.10	1.74	12.10
#FFFFFF	12.10	1.00	21.00	1.00
#000000	1.74	21.00	1.00	21.00
##FFFFFF	12.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F3A65

Deuteranopia (green-blind)

#123362

Tritanopia (blue-blind)

#004047

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b3563;
/* rgb */ color: rgb(27, 53, 99);
/* oklch */ color: oklch(33.5% 0.087 260.9);

Tailwind

colors: {
  custom: {
    50: '#616b90',
    500: '#1b3563',
    950: '#000000',
  },
}

SCSS

$custom: #1b3563;
$custom-light: #616b90;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3563",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 99
  },
  "hsl": {
    "h": 218.333,
    "s": 57.143,
    "l": 24.706
  },
  "oklch": {
    "l": 0.33491,
    "c": 0.08731,
    "h": 260.9
  },
  "luminance": 0.0368
}

Semantic roles & 50–950 ramp

primary

#1B3563

secondary

#987941

accent

#A947E0

background

#F6F6F8

surface

#EBEBF0

border

#C6C6CB

text

#05060C

muted

#7A7A7D

Preview Lab

Preview with #1B3563

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

Preview Lab → · Contrast checker → · Palette generator →