#1F178A#1F178A

#1F178A is a dark, vivid blue. Relative luminance 0.027; OKLCH L 32.0% C 0.177 H 273.1°. Best body text is #FFFFFF at 13.57:1 contrast (WCAG AA passes).

Color values

HEX	#1F178A
RGB	rgb(31, 23, 138)
HSL	hsl(244, 71%, 32%)
HSV	hsv(244, 83%, 54%)
CMYK	cmyk(77.5%, 83.3%, 0%, 45.9%)
CIE-LAB	lab(18.96, 42.18, -61.00)
CIE-LCH	lch(18.96, 74.16, 304.67°)
OKLab	oklab(32% 0.0095 -0.1765)
OKLCH	oklch(32% 0.177 273.1)
XYZ	xyz(5.4574, 2.7385, 24.2808)
Luminance	0.0274 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F178A #828A17

analogous

#17498A #1F178A #59178A

triadic

#1F178A #8A1F17 #178A1F

tetradic

#1F178A #8A1749 #828A17 #178A59

square

#1F178A #8A1749 #828A17 #178A59

split-complementary

#1F178A #8A5917 #498A17

monochromatic

#070621 #130E56 #1F178A #2B20BE #483DDF

Accessibility & contrast

On white

13.57

#1F178A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.55

#1F178A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F178A

13.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F178A	#FFFFFF	#000000	##FFFFFF
##1F178A	1.00	13.57	1.55	13.57
#FFFFFF	13.57	1.00	21.00	1.00
#000000	1.55	21.00	1.00	21.00
##FFFFFF	13.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00338D

Deuteranopia (green-blind)

#002888

Tritanopia (blue-blind)

#003B51

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1f178a;
/* rgb */ color: rgb(31, 23, 138);
/* oklch */ color: oklch(32.0% 0.177 273.1);

Tailwind

colors: {
  custom: {
    50: '#6f58ad',
    500: '#1f178a',
    950: '#000000',
  },
}

SCSS

$custom: #1f178a;
$custom-light: #6f58ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f178a",
  "rgb": {
    "r": 31,
    "g": 23,
    "b": 138
  },
  "hsl": {
    "h": 244.174,
    "s": 71.429,
    "l": 31.569
  },
  "oklch": {
    "l": 0.32002,
    "c": 0.17672,
    "h": 273.1
  },
  "luminance": 0.02739
}

Semantic roles & 50–950 ramp

primary

#1F178A

secondary

#B5BE3F

accent

#EE3AE2

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#090310

muted

#7B787F

Preview Lab

Preview with #1F178A

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

Preview Lab → · Contrast checker → · Palette generator →