#1F3873#1F3873

#1F3873 is a dark, moderate blue. Relative luminance 0.044; OKLCH L 35.6% C 0.106 H 264.4°. Best body text is #FFFFFF at 11.22:1 contrast (WCAG AA passes).

Color values

HEX	#1F3873
RGB	rgb(31, 56, 115)
HSL	hsl(222, 58%, 29%)
HSV	hsv(222, 73%, 45%)
CMYK	cmyk(73%, 51.3%, 0%, 54.9%)
CIE-LAB	lab(24.82, 12.31, -36.87)
CIE-LCH	lch(24.82, 38.87, 288.46°)
OKLab	oklab(35.62% -0.0104 -0.1058)
OKLCH	oklch(35.62% 0.106 264.4)
XYZ	xyz(5.0727, 4.3569, 16.7900)
Luminance	0.0436 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3873 #735A1F

analogous

#1F6273 #1F3873 #301F73

triadic

#1F3873 #731F38 #38731F

tetradic

#1F3873 #731F62 #735A1F #1F7330

square

#1F3873 #731F62 #735A1F #1F7330

split-complementary

#1F3873 #73301F #62731F

monochromatic

#060C18 #122143 #1F3873 #2C4FA3 #416ACC

Accessibility & contrast

On white

11.22

#1F3873 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#1F3873 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3873

11.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3873	#FFFFFF	#000000	##FFFFFF
##1F3873	1.00	11.22	1.87	11.22
#FFFFFF	11.22	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#173F75

Deuteranopia (green-blind)

#003772

Tritanopia (blue-blind)

#004650

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1f3873;
/* rgb */ color: rgb(31, 56, 115);
/* oklch */ color: oklch(35.6% 0.106 264.4);

Tailwind

colors: {
  custom: {
    50: '#666e9c',
    500: '#1f3873',
    950: '#000000',
  },
}

SCSS

$custom: #1f3873;
$custom-light: #666e9c;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3873",
  "rgb": {
    "r": 31,
    "g": 56,
    "b": 115
  },
  "hsl": {
    "h": 222.143,
    "s": 57.534,
    "l": 28.627
  },
  "oklch": {
    "l": 0.35616,
    "c": 0.10631,
    "h": 264.4
  },
  "luminance": 0.04357
}

Semantic roles & 50–950 ramp

primary

#1F3873

secondary

#A78A47

accent

#B347E1

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1F3873

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

Preview Lab → · Contrast checker → · Palette generator →