#1B3F72#1B3F72

#1B3F72 is a dark, moderate blue. Relative luminance 0.050; OKLCH L 37.0% C 0.097 H 257.6°. Best body text is #FFFFFF at 10.50:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F72
RGB	rgb(27, 63, 114)
HSL	hsl(215, 62%, 28%)
HSV	hsv(215, 76%, 45%)
CMYK	cmyk(76.3%, 44.7%, 0%, 55.3%)
CIE-LAB	lab(26.74, 6.38, -33.16)
CIE-LCH	lch(26.74, 33.77, 280.89°)
OKLab	oklab(37.03% -0.0209 -0.0948)
OKLCH	oklch(37.03% 0.097 257.6)
XYZ	xyz(5.2657, 5.0024, 16.6044)
Luminance	0.0500 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F72 #724E1B

analogous

#1B6B72 #1B3F72 #221B72

triadic

#1B3F72 #721B3F #3F721B

tetradic

#1B3F72 #721B6B #724E1B #1B7222

square

#1B3F72 #721B6B #724E1B #1B7222

split-complementary

#1B3F72 #72221B #6B721B

monochromatic

#060E19 #0F2441 #1B3F72 #275AA3 #3877D0

Accessibility & contrast

On white

10.50

#1B3F72 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1B3F72 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F72

10.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F72	#FFFFFF	#000000	##FFFFFF
##1B3F72	1.00	10.50	2.00	10.50
#FFFFFF	10.50	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#264474

Deuteranopia (green-blind)

#173C71

Tritanopia (blue-blind)

#004B53

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b3f72;
/* rgb */ color: rgb(27, 63, 114);
/* oklch */ color: oklch(37.0% 0.097 257.6);

Tailwind

colors: {
  custom: {
    50: '#64739b',
    500: '#1b3f72',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f72;
$custom-light: #64739b;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f72",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 114
  },
  "hsl": {
    "h": 215.172,
    "s": 61.702,
    "l": 27.647
  },
  "oklch": {
    "l": 0.37025,
    "c": 0.09709,
    "h": 257.6
  },
  "luminance": 0.05003
}

Semantic roles & 50–950 ramp

primary

#1B3F72

secondary

#A77D42

accent

#A243E5

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080E

muted

#7A7B7E

Preview Lab

Preview with #1B3F72

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

Preview Lab → · Contrast checker → · Palette generator →