#1F398A#1F398A

#1F398A is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.7% C 0.139 H 266.2°. Best body text is #FFFFFF at 10.44:1 contrast (WCAG AA passes).

Color values

HEX	#1F398A
RGB	rgb(31, 57, 138)
HSL	hsl(225, 63%, 33%)
HSV	hsv(225, 78%, 54%)
CMYK	cmyk(77.5%, 58.7%, 0%, 45.9%)
CIE-LAB	lab(26.88, 20.82, -47.99)
CIE-LCH	lch(26.88, 52.31, 293.46°)
OKLab	oklab(37.74% -0.0091 -0.1385)
OKLCH	oklch(37.74% 0.139 266.2)
XYZ	xyz(6.6140, 5.0518, 24.6663)
Luminance	0.0505 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F398A #8A701F

analogous

#1F6E8A #1F398A #3B1F8A

triadic

#1F398A #8A1F39 #398A1F

tetradic

#1F398A #8A1F6E #8A701F #1F8A3B

square

#1F398A #8A1F6E #8A701F #1F8A3B

split-complementary

#1F398A #8A3B1F #6E8A1F

monochromatic

#091026 #142458 #1F398A #2A4EBC #4C6ED7

Accessibility & contrast

On white

10.44

#1F398A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1F398A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F398A

10.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F398A	#FFFFFF	#000000	##FFFFFF
##1F398A	1.00	10.44	2.01	10.44
#FFFFFF	10.44	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458D

Deuteranopia (green-blind)

#003B88

Tritanopia (blue-blind)

#004D5B

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f398a;
/* rgb */ color: rgb(31, 57, 138);
/* oklch */ color: oklch(37.7% 0.139 266.2);

Tailwind

colors: {
  custom: {
    50: '#6c6fad',
    500: '#1f398a',
    950: '#000000',
  },
}

SCSS

$custom: #1f398a;
$custom-light: #6c6fad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f398a",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 138
  },
  "hsl": {
    "h": 225.421,
    "s": 63.314,
    "l": 33.137
  },
  "oklch": {
    "l": 0.37739,
    "c": 0.13877,
    "h": 266.2
  },
  "luminance": 0.05053
}

Semantic roles & 50–950 ramp

primary

#1F398A

secondary

#BA9F4B

accent

#BE41E6

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1F398A

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

Preview Lab → · Contrast checker → · Palette generator →