#1F3D8A#1F3D8A

#1F3D8A is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.6% C 0.134 H 264.7°. Best body text is #FFFFFF at 10.03:1 contrast (WCAG AA passes).

Color values

HEX	#1F3D8A
RGB	rgb(31, 61, 138)
HSL	hsl(223, 63%, 33%)
HSV	hsv(223, 78%, 54%)
CMYK	cmyk(77.5%, 55.8%, 0%, 45.9%)
CIE-LAB	lab(28.02, 18.05, -46.15)
CIE-LCH	lch(28.02, 49.55, 291.36°)
OKLab	oklab(38.59% -0.0123 -0.133)
OKLCH	oklch(38.59% 0.134 264.7)
XYZ	xyz(6.8196, 5.4630, 24.7349)
Luminance	0.0546 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3D8A #8A6C1F

analogous

#1F728A #1F3D8A #371F8A

triadic

#1F3D8A #8A1F3D #3D8A1F

tetradic

#1F3D8A #8A1F72 #8A6C1F #1F8A37

square

#1F3D8A #8A1F72 #8A6C1F #1F8A37

split-complementary

#1F3D8A #8A371F #728A1F

monochromatic

#091126 #142758 #1F3D8A #2A53BC #4C73D7

Accessibility & contrast

On white

10.03

#1F3D8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#1F3D8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3D8A

10.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3D8A	#FFFFFF	#000000	##FFFFFF
##1F3D8A	1.00	10.03	2.09	10.03
#FFFFFF	10.03	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478D

Deuteranopia (green-blind)

#003D88

Tritanopia (blue-blind)

#00505D

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1f3d8a;
/* rgb */ color: rgb(31, 61, 138);
/* oklch */ color: oklch(38.6% 0.134 264.7);

Tailwind

colors: {
  custom: {
    50: '#6c72ad',
    500: '#1f3d8a',
    950: '#000000',
  },
}

SCSS

$custom: #1f3d8a;
$custom-light: #6c72ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3d8a",
  "rgb": {
    "r": 31,
    "g": 61,
    "b": 138
  },
  "hsl": {
    "h": 223.178,
    "s": 63.314,
    "l": 33.137
  },
  "oklch": {
    "l": 0.38593,
    "c": 0.13355,
    "h": 264.7
  },
  "luminance": 0.05464
}

Semantic roles & 50–950 ramp

primary

#1F3D8A

secondary

#BA9B4B

accent

#B841E6

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1F3D8A

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

Preview Lab → · Contrast checker → · Palette generator →