#1F3973#1F3973

#1F3973 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.8% C 0.105 H 263.8°. Best body text is #FFFFFF at 11.11:1 contrast (WCAG AA passes).

Color values

HEX	#1F3973
RGB	rgb(31, 57, 115)
HSL	hsl(221, 58%, 29%)
HSV	hsv(221, 73%, 45%)
CMYK	cmyk(73%, 50.4%, 0%, 54.9%)
CIE-LAB	lab(25.12, 11.61, -36.38)
CIE-LCH	lch(25.12, 38.19, 287.69°)
OKLab	oklab(35.85% -0.0114 -0.1043)
OKLCH	oklch(35.85% 0.105 263.8)
XYZ	xyz(5.1216, 4.4548, 16.8063)
Luminance	0.0445 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3973 #73591F

analogous

#1F6373 #1F3973 #2F1F73

triadic

#1F3973 #731F39 #39731F

tetradic

#1F3973 #731F63 #73591F #1F732F

square

#1F3973 #731F63 #73591F #1F732F

split-complementary

#1F3973 #732F1F #63731F

monochromatic

#060C18 #122143 #1F3973 #2C51A3 #416CCC

Accessibility & contrast

On white

11.11

#1F3973 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1F3973 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3973

11.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3973	#FFFFFF	#000000	##FFFFFF
##1F3973	1.00	11.11	1.89	11.11
#FFFFFF	11.11	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A4075

Deuteranopia (green-blind)

#043872

Tritanopia (blue-blind)

#004750

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1f3973;
/* rgb */ color: rgb(31, 57, 115);
/* oklch */ color: oklch(35.8% 0.105 263.8);

Tailwind

colors: {
  custom: {
    50: '#666e9c',
    500: '#1f3973',
    950: '#000000',
  },
}

SCSS

$custom: #1f3973;
$custom-light: #666e9c;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3973",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 115
  },
  "hsl": {
    "h": 221.429,
    "s": 57.534,
    "l": 28.627
  },
  "oklch": {
    "l": 0.35848,
    "c": 0.10496,
    "h": 263.8
  },
  "luminance": 0.04455
}

Semantic roles & 50–950 ramp

primary

#1F3973

secondary

#A78947

accent

#B147E1

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1F3973

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

Preview Lab → · Contrast checker → · Palette generator →