#1F3A8A#1F3A8A

#1F3A8A is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.0% C 0.137 H 265.9°. Best body text is #FFFFFF at 10.34:1 contrast (WCAG AA passes).

Color values

HEX	#1F3A8A
RGB	rgb(31, 58, 138)
HSL	hsl(225, 63%, 33%)
HSV	hsv(225, 78%, 54%)
CMYK	cmyk(77.5%, 58%, 0%, 45.9%)
CIE-LAB	lab(27.16, 20.13, -47.53)
CIE-LCH	lch(27.16, 51.62, 292.95°)
OKLab	oklab(37.95% -0.0099 -0.1371)
OKLCH	oklch(37.95% 0.137 265.9)
XYZ	xyz(6.6640, 5.1517, 24.6830)
Luminance	0.0515 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3A8A #8A6F1F

analogous

#1F6F8A #1F3A8A #391F8A

triadic

#1F3A8A #8A1F3A #3A8A1F

tetradic

#1F3A8A #8A1F6F #8A6F1F #1F8A39

square

#1F3A8A #8A1F6F #8A6F1F #1F8A39

split-complementary

#1F3A8A #8A391F #6F8A1F

monochromatic

#091026 #142558 #1F3A8A #2A4FBC #4C6FD7

Accessibility & contrast

On white

10.34

#1F3A8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#1F3A8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3A8A

10.34:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3A8A	#FFFFFF	#000000	##FFFFFF
##1F3A8A	1.00	10.34	2.03	10.34
#FFFFFF	10.34	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.34	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458D

Deuteranopia (green-blind)

#003B88

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f3a8a;
/* rgb */ color: rgb(31, 58, 138);
/* oklch */ color: oklch(38.0% 0.137 265.9);

Tailwind

colors: {
  custom: {
    50: '#6c6fad',
    500: '#1f3a8a',
    950: '#000000',
  },
}

SCSS

$custom: #1f3a8a;
$custom-light: #6c6fad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3a8a",
  "rgb": {
    "r": 31,
    "g": 58,
    "b": 138
  },
  "hsl": {
    "h": 224.86,
    "s": 63.314,
    "l": 33.137
  },
  "oklch": {
    "l": 0.3795,
    "c": 0.13747,
    "h": 265.9
  },
  "luminance": 0.05152
}

Semantic roles & 50–950 ramp

primary

#1F3A8A

secondary

#BA9E4B

accent

#BD41E6

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1F3A8A

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

Preview Lab → · Contrast checker → · Palette generator →