#1F178E#1F178E

#1F178E is a dark, vivid blue. Relative luminance 0.029; OKLCH L 32.5% C 0.182 H 272.7°. Best body text is #FFFFFF at 13.36:1 contrast (WCAG AA passes).

Color values

HEX	#1F178E
RGB	rgb(31, 23, 142)
HSL	hsl(244, 72%, 32%)
HSV	hsv(244, 84%, 56%)
CMYK	cmyk(78.2%, 83.8%, 0%, 44.3%)
CIE-LAB	lab(19.46, 43.46, -62.68)
CIE-LCH	lch(19.46, 76.27, 304.74°)
OKLab	oklab(32.49% 0.0084 -0.1813)
OKLCH	oklch(32.49% 0.182 272.7)
XYZ	xyz(5.7523, 2.8565, 25.8341)
Luminance	0.0286 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F178E #868E17

analogous

#174A8E #1F178E #5B178E

triadic

#1F178E #8E1F17 #178E1F

tetradic

#1F178E #8E174A #868E17 #178E5B

square

#1F178E #8E174A #868E17 #178E5B

split-complementary

#1F178E #8E5B17 #4A8E17

monochromatic

#080625 #140E59 #1F178E #2A20C3 #4A3FE0

Accessibility & contrast

On white

13.36

#1F178E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.57

#1F178E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F178E

13.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F178E	#FFFFFF	#000000	##FFFFFF
##1F178E	1.00	13.36	1.57	13.36
#FFFFFF	13.36	1.00	21.00	1.00
#000000	1.57	21.00	1.00	21.00
##FFFFFF	13.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003591

Deuteranopia (green-blind)

#00298C

Tritanopia (blue-blind)

#003D54

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1f178e;
/* rgb */ color: rgb(31, 23, 142);
/* oklch */ color: oklch(32.5% 0.182 272.7);

Tailwind

colors: {
  custom: {
    50: '#7058b0',
    500: '#1f178e',
    950: '#000000',
  },
}

SCSS

$custom: #1f178e;
$custom-light: #7058b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f178e",
  "rgb": {
    "r": 31,
    "g": 23,
    "b": 142
  },
  "hsl": {
    "h": 244.034,
    "s": 72.121,
    "l": 32.353
  },
  "oklch": {
    "l": 0.32488,
    "c": 0.18153,
    "h": 272.7
  },
  "luminance": 0.02857
}

Semantic roles & 50–950 ramp

primary

#1F178E

secondary

#B8C040

accent

#EF39E3

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1F178E

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

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