#1F337D#1F337D

#1F337D is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.3% C 0.128 H 267.8°. Best body text is #FFFFFF at 11.49:1 contrast (WCAG AA passes).

Color values

HEX	#1F337D
RGB	rgb(31, 51, 125)
HSL	hsl(227, 60%, 31%)
HSV	hsv(227, 75%, 49%)
CMYK	cmyk(75.2%, 59.2%, 0%, 51%)
CIE-LAB	lab(24.13, 19.84, -44.34)
CIE-LCH	lch(24.13, 48.57, 294.11°)
OKLab	oklab(35.34% -0.005 -0.1278)
OKLCH	oklch(35.34% 0.128 267.8)
XYZ	xyz(5.4493, 4.1391, 19.9098)
Luminance	0.0414 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F337D #7D691F

analogous

#1F627D #1F337D #3A1F7D

triadic

#1F337D #7D1F33 #337D1F

tetradic

#1F337D #7D1F62 #7D691F #1F7D3A

square

#1F337D #7D1F62 #7D691F #1F7D3A

split-complementary

#1F337D #7D3A1F #627D1F

monochromatic

#070B1B #131F4C #1F337D #2B47AE #4563D1

Accessibility & contrast

On white

11.49

#1F337D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#1F337D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F337D

11.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F337D	#FFFFFF	#000000	##FFFFFF
##1F337D	1.00	11.49	1.83	11.49
#FFFFFF	11.49	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E80

Deuteranopia (green-blind)

#00357C

Tritanopia (blue-blind)

#004552

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1f337d;
/* rgb */ color: rgb(31, 51, 125);
/* oklch */ color: oklch(35.3% 0.128 267.8);

Tailwind

colors: {
  custom: {
    50: '#696aa3',
    500: '#1f337d',
    950: '#000000',
  },
}

SCSS

$custom: #1f337d;
$custom-light: #696aa3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f337d",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 125
  },
  "hsl": {
    "h": 227.234,
    "s": 60.256,
    "l": 30.588
  },
  "oklch": {
    "l": 0.35337,
    "c": 0.12793,
    "h": 267.8
  },
  "luminance": 0.0414
}

Semantic roles & 50–950 ramp

primary

#1F337D

secondary

#B09A48

accent

#C244E3

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F337D

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

Preview Lab → · Contrast checker → · Palette generator →