#1F3773#1F3773

#1F3773 is a dark, moderate blue. Relative luminance 0.043; OKLCH L 35.4% C 0.108 H 265.0°. Best body text is #FFFFFF at 11.34:1 contrast (WCAG AA passes).

Color values

HEX	#1F3773
RGB	rgb(31, 55, 115)
HSL	hsl(223, 58%, 29%)
HSV	hsv(223, 73%, 45%)
CMYK	cmyk(73%, 52.2%, 0%, 54.9%)
CIE-LAB	lab(24.52, 13.02, -37.36)
CIE-LCH	lch(24.52, 39.56, 289.21°)
OKLab	oklab(35.39% -0.0094 -0.1072)
OKLCH	oklch(35.39% 0.108 265)
XYZ	xyz(5.0247, 4.2610, 16.7740)
Luminance	0.0426 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3773 #735B1F

analogous

#1F6173 #1F3773 #311F73

triadic

#1F3773 #731F37 #37731F

tetradic

#1F3773 #731F61 #735B1F #1F7331

square

#1F3773 #731F61 #735B1F #1F7331

split-complementary

#1F3773 #73311F #61731F

monochromatic

#060C18 #122043 #1F3773 #2C4EA3 #4168CC

Accessibility & contrast

On white

11.34

#1F3773 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#1F3773 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3773

11.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3773	#FFFFFF	#000000	##FFFFFF
##1F3773	1.00	11.34	1.85	11.34
#FFFFFF	11.34	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#143E75

Deuteranopia (green-blind)

#003772

Tritanopia (blue-blind)

#00454F

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f3773;
/* rgb */ color: rgb(31, 55, 115);
/* oklch */ color: oklch(35.4% 0.108 265.0);

Tailwind

colors: {
  custom: {
    50: '#666d9c',
    500: '#1f3773',
    950: '#000000',
  },
}

SCSS

$custom: #1f3773;
$custom-light: #666d9c;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3773",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 115
  },
  "hsl": {
    "h": 222.857,
    "s": 57.534,
    "l": 28.627
  },
  "oklch": {
    "l": 0.35386,
    "c": 0.10766,
    "h": 265
  },
  "luminance": 0.04261
}

Semantic roles & 50–950 ramp

primary

#1F3773

secondary

#A78B47

accent

#B547E1

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1F3773

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

Preview Lab → · Contrast checker → · Palette generator →