#1F178C#1F178C

#1F178C is a dark, vivid blue. Relative luminance 0.028; OKLCH L 32.2% C 0.179 H 272.9°. Best body text is #FFFFFF at 13.46:1 contrast (WCAG AA passes).

Color values

HEX	#1F178C
RGB	rgb(31, 23, 140)
HSL	hsl(244, 72%, 32%)
HSV	hsv(244, 84%, 55%)
CMYK	cmyk(77.9%, 83.6%, 0%, 45.1%)
CIE-LAB	lab(19.21, 42.83, -61.84)
CIE-LCH	lch(19.21, 75.22, 304.70°)
OKLab	oklab(32.25% 0.009 -0.1789)
OKLCH	oklch(32.25% 0.179 272.9)
XYZ	xyz(5.6035, 2.7970, 25.0504)
Luminance	0.0280 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F178C #848C17

analogous

#17498C #1F178C #5A178C

triadic

#1F178C #8C1F17 #178C1F

tetradic

#1F178C #8C1749 #848C17 #178C5A

square

#1F178C #8C1749 #848C17 #178C5A

split-complementary

#1F178C #8C5A17 #498C17

monochromatic

#080623 #130E57 #1F178C #2B20C1 #493EDF

Accessibility & contrast

On white

13.46

#1F178C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.56

#1F178C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F178C

13.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F178C	#FFFFFF	#000000	##FFFFFF
##1F178C	1.00	13.46	1.56	13.46
#FFFFFF	13.46	1.00	21.00	1.00
#000000	1.56	21.00	1.00	21.00
##FFFFFF	13.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00348F

Deuteranopia (green-blind)

#00298A

Tritanopia (blue-blind)

#003C53

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1f178c;
/* rgb */ color: rgb(31, 23, 140);
/* oklch */ color: oklch(32.2% 0.179 272.9);

Tailwind

colors: {
  custom: {
    50: '#7058af',
    500: '#1f178c',
    950: '#000000',
  },
}

SCSS

$custom: #1f178c;
$custom-light: #7058af;
$custom-dark: #000000;

JSON

{
  "hex": "#1f178c",
  "rgb": {
    "r": 31,
    "g": 23,
    "b": 140
  },
  "hsl": {
    "h": 244.103,
    "s": 71.779,
    "l": 31.961
  },
  "oklch": {
    "l": 0.32245,
    "c": 0.17913,
    "h": 272.9
  },
  "luminance": 0.02798
}

Semantic roles & 50–950 ramp

primary

#1F178C

secondary

#B7BF3F

accent

#EF39E2

background

#F7F5FA

surface

#EDE9F5

border

#C8C5CF

text

#090311

muted

#7B7880

Preview Lab

Preview with #1F178C

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

Preview Lab → · Contrast checker → · Palette generator →