#1F178F#1F178F

#1F178F is a dark, vivid blue. Relative luminance 0.029; OKLCH L 32.6% C 0.183 H 272.6°. Best body text is #FFFFFF at 13.31:1 contrast (WCAG AA passes).

Color values

HEX	#1F178F
RGB	rgb(31, 23, 143)
HSL	hsl(244, 72%, 33%)
HSV	hsv(244, 84%, 56%)
CMYK	cmyk(78.3%, 83.9%, 0%, 43.9%)
CIE-LAB	lab(19.58, 43.78, -63.10)
CIE-LCH	lch(19.58, 76.80, 304.76°)
OKLab	oklab(32.61% 0.0082 -0.1825)
OKLCH	oklch(32.61% 0.183 272.6)
XYZ	xyz(5.8277, 2.8866, 26.2313)
Luminance	0.0289 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F178F #878F17

analogous

#174B8F #1F178F #5B178F

triadic

#1F178F #8F1F17 #178F1F

tetradic

#1F178F #8F174B #878F17 #178F5B

square

#1F178F #8F174B #878F17 #178F5B

split-complementary

#1F178F #8F5B17 #4B8F17

monochromatic

#080626 #140F5A #1F178F #2A1FC4 #4B40E0

Accessibility & contrast

On white

13.31

#1F178F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.58

#1F178F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F178F

13.31:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F178F	#FFFFFF	#000000	##FFFFFF
##1F178F	1.00	13.31	1.58	13.31
#FFFFFF	13.31	1.00	21.00	1.00
#000000	1.58	21.00	1.00	21.00
##FFFFFF	13.31	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003592

Deuteranopia (green-blind)

#00298D

Tritanopia (blue-blind)

#003E54

Achromatopsia (no color)

#2F2F2F

Design tokens & code

CSS

--color: #1f178f;
/* rgb */ color: rgb(31, 23, 143);
/* oklch */ color: oklch(32.6% 0.183 272.6);

Tailwind

colors: {
  custom: {
    50: '#7058b1',
    500: '#1f178f',
    950: '#000000',
  },
}

SCSS

$custom: #1f178f;
$custom-light: #7058b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f178f",
  "rgb": {
    "r": 31,
    "g": 23,
    "b": 143
  },
  "hsl": {
    "h": 244,
    "s": 72.289,
    "l": 32.549
  },
  "oklch": {
    "l": 0.3261,
    "c": 0.18272,
    "h": 272.6
  },
  "luminance": 0.02887
}

Semantic roles & 50–950 ramp

primary

#1F178F

secondary

#B8C141

accent

#EF39E3

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090311

muted

#7B7880

Preview Lab

Preview with #1F178F

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

Preview Lab → · Contrast checker → · Palette generator →