#1F317D#1F317D

#1F317D is a dark, vivid blue. Relative luminance 0.040; OKLCH L 34.9% C 0.131 H 268.5°. Best body text is #FFFFFF at 11.71:1 contrast (WCAG AA passes).

Color values

HEX	#1F317D
RGB	rgb(31, 49, 125)
HSL	hsl(229, 60%, 31%)
HSV	hsv(229, 75%, 49%)
CMYK	cmyk(75.2%, 60.8%, 0%, 51%)
CIE-LAB	lab(23.57, 21.24, -45.25)
CIE-LCH	lch(23.57, 49.99, 295.15°)
OKLab	oklab(34.92% -0.0033 -0.1305)
OKLCH	oklch(34.92% 0.131 268.5)
XYZ	xyz(5.3638, 3.9680, 19.8813)
Luminance	0.0397 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F317D #7D6B1F

analogous

#1F607D #1F317D #3C1F7D

triadic

#1F317D #7D1F31 #317D1F

tetradic

#1F317D #7D1F60 #7D6B1F #1F7D3C

square

#1F317D #7D1F60 #7D6B1F #1F7D3C

split-complementary

#1F317D #7D3C1F #607D1F

monochromatic

#070B1B #131E4C #1F317D #2B44AE #4560D1

Accessibility & contrast

On white

11.71

#1F317D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#1F317D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F317D

11.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F317D	#FFFFFF	#000000	##FFFFFF
##1F317D	1.00	11.71	1.79	11.71
#FFFFFF	11.71	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D80

Deuteranopia (green-blind)

#00347C

Tritanopia (blue-blind)

#004452

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1f317d;
/* rgb */ color: rgb(31, 49, 125);
/* oklch */ color: oklch(34.9% 0.131 268.5);

Tailwind

colors: {
  custom: {
    50: '#6968a3',
    500: '#1f317d',
    950: '#000000',
  },
}

SCSS

$custom: #1f317d;
$custom-light: #6968a3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f317d",
  "rgb": {
    "r": 31,
    "g": 49,
    "b": 125
  },
  "hsl": {
    "h": 228.511,
    "s": 60.256,
    "l": 30.588
  },
  "oklch": {
    "l": 0.34919,
    "c": 0.13058,
    "h": 268.5
  },
  "luminance": 0.03969
}

Semantic roles & 50–950 ramp

primary

#1F317D

secondary

#B09C48

accent

#C544E3

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F317D

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

Preview Lab → · Contrast checker → · Palette generator →