#1B3D73#1B3D73

#1B3D73 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.6% C 0.101 H 259.3°. Best body text is #FFFFFF at 10.71:1 contrast (WCAG AA passes).

Color values

HEX	#1B3D73
RGB	rgb(27, 61, 115)
HSL	hsl(217, 62%, 28%)
HSV	hsv(217, 77%, 45%)
CMYK	cmyk(76.5%, 47%, 0%, 54.9%)
CIE-LAB	lab(26.18, 8.17, -34.69)
CIE-LCH	lch(26.18, 35.64, 283.26°)
OKLab	oklab(36.61% -0.0187 -0.0994)
OKLCH	oklch(36.61% 0.101 259.3)
XYZ	xyz(5.2141, 4.8077, 16.8695)
Luminance	0.0481 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3D73 #73511B

analogous

#1B6973 #1B3D73 #251B73

triadic

#1B3D73 #731B3D #3D731B

tetradic

#1B3D73 #731B69 #73511B #1B7325

square

#1B3D73 #731B69 #73511B #1B7325

split-complementary

#1B3D73 #73251B #69731B

monochromatic

#060D19 #0F2341 #1B3D73 #2757A5 #3873D0

Accessibility & contrast

On white

10.71

#1B3D73 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#1B3D73 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3D73

10.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3D73	#FFFFFF	#000000	##FFFFFF
##1B3D73	1.00	10.71	1.96	10.71
#FFFFFF	10.71	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#224275

Deuteranopia (green-blind)

#103A72

Tritanopia (blue-blind)

#004A52

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1b3d73;
/* rgb */ color: rgb(27, 61, 115);
/* oklch */ color: oklch(36.6% 0.101 259.3);

Tailwind

colors: {
  custom: {
    50: '#64729c',
    500: '#1b3d73',
    950: '#000000',
  },
}

SCSS

$custom: #1b3d73;
$custom-light: #64729c;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3d73",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 115
  },
  "hsl": {
    "h": 216.818,
    "s": 61.972,
    "l": 27.843
  },
  "oklch": {
    "l": 0.36612,
    "c": 0.10111,
    "h": 259.3
  },
  "luminance": 0.04808
}

Semantic roles & 50–950 ramp

primary

#1B3D73

secondary

#A88042

accent

#A643E5

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1B3D73

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

Preview Lab → · Contrast checker → · Palette generator →