#1F337E#1F337E

#1F337E is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.4% C 0.129 H 267.8°. Best body text is #FFFFFF at 11.46:1 contrast (WCAG AA passes).

Color values

HEX	#1F337E
RGB	rgb(31, 51, 126)
HSL	hsl(227, 61%, 31%)
HSV	hsv(227, 75%, 49%)
CMYK	cmyk(75.4%, 59.5%, 0%, 50.6%)
CIE-LAB	lab(24.21, 20.24, -44.83)
CIE-LCH	lch(24.21, 49.19, 294.30°)
OKLab	oklab(35.43% -0.0049 -0.1293)
OKLCH	oklch(35.43% 0.129 267.8)
XYZ	xyz(5.5135, 4.1647, 20.2479)
Luminance	0.0416 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F337E #7E6A1F

analogous

#1F627E #1F337E #3A1F7E

triadic

#1F337E #7E1F33 #337E1F

tetradic

#1F337E #7E1F62 #7E6A1F #1F7E3A

square

#1F337E #7E1F62 #7E6A1F #1F7E3A

split-complementary

#1F337E #7E3A1F #627E1F

monochromatic

#070B1C #131F4D #1F337E #2B47AF #4663D1

Accessibility & contrast

On white

11.46

#1F337E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#1F337E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F337E

11.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F337E	#FFFFFF	#000000	##FFFFFF
##1F337E	1.00	11.46	1.83	11.46
#FFFFFF	11.46	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E81

Deuteranopia (green-blind)

#00357D

Tritanopia (blue-blind)

#004653

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f337e;
/* rgb */ color: rgb(31, 51, 126);
/* oklch */ color: oklch(35.4% 0.129 267.8);

Tailwind

colors: {
  custom: {
    50: '#696aa4',
    500: '#1f337e',
    950: '#000000',
  },
}

SCSS

$custom: #1f337e;
$custom-light: #696aa4;
$custom-dark: #000000;

JSON

{
  "hex": "#1f337e",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 126
  },
  "hsl": {
    "h": 227.368,
    "s": 60.51,
    "l": 30.784
  },
  "oklch": {
    "l": 0.35425,
    "c": 0.12938,
    "h": 267.8
  },
  "luminance": 0.04165
}

Semantic roles & 50–950 ramp

primary

#1F337E

secondary

#B19B48

accent

#C244E4

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F337E

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

Preview Lab → · Contrast checker → · Palette generator →