#1F178D#1F178D

#1F178D is a dark, vivid blue. Relative luminance 0.028; OKLCH L 32.4% C 0.180 H 272.8°. Best body text is #FFFFFF at 13.42:1 contrast (WCAG AA passes).

Color values

HEX	#1F178D
RGB	rgb(31, 23, 141)
HSL	hsl(244, 72%, 32%)
HSV	hsv(244, 84%, 55%)
CMYK	cmyk(78%, 83.7%, 0%, 44.7%)
CIE-LAB	lab(19.34, 43.15, -62.26)
CIE-LCH	lch(19.34, 75.75, 304.72°)
OKLab	oklab(32.37% 0.0087 -0.1801)
OKLCH	oklch(32.37% 0.18 272.8)
XYZ	xyz(5.6776, 2.8266, 25.4405)
Luminance	0.0283 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F178D #858D17

analogous

#174A8D #1F178D #5A178D

triadic

#1F178D #8D1F17 #178D1F

tetradic

#1F178D #8D174A #858D17 #178D5A

square

#1F178D #8D174A #858D17 #178D5A

split-complementary

#1F178D #8D5A17 #4A8D17

monochromatic

#080624 #130E58 #1F178D #2B20C2 #4A3FE0

Accessibility & contrast

On white

13.42

#1F178D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1F178D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F178D

13.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F178D	#FFFFFF	#000000	##FFFFFF
##1F178D	1.00	13.42	1.57	13.42
#FFFFFF	13.42	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003490

Deuteranopia (green-blind)

#00298B

Tritanopia (blue-blind)

#003D53

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1f178d;
/* rgb */ color: rgb(31, 23, 141);
/* oklch */ color: oklch(32.4% 0.180 272.8);

Tailwind

colors: {
  custom: {
    50: '#7058b0',
    500: '#1f178d',
    950: '#000000',
  },
}

SCSS

$custom: #1f178d;
$custom-light: #7058b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f178d",
  "rgb": {
    "r": 31,
    "g": 23,
    "b": 141
  },
  "hsl": {
    "h": 244.068,
    "s": 71.951,
    "l": 32.157
  },
  "oklch": {
    "l": 0.32366,
    "c": 0.18033,
    "h": 272.8
  },
  "luminance": 0.02827
}

Semantic roles & 50–950 ramp

primary

#1F178D

secondary

#B7C040

accent

#EF39E2

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1F178D

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

Preview Lab → · Contrast checker → · Palette generator →