#1F337F#1F337F

#1F337F is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.5% C 0.131 H 267.9°. Best body text is #FFFFFF at 11.42:1 contrast (WCAG AA passes).

Color values

HEX	#1F337F
RGB	rgb(31, 51, 127)
HSL	hsl(228, 61%, 31%)
HSV	hsv(228, 76%, 50%)
CMYK	cmyk(75.6%, 59.8%, 0%, 50.2%)
CIE-LAB	lab(24.29, 20.64, -45.33)
CIE-LCH	lch(24.29, 49.80, 294.48°)
OKLab	oklab(35.51% -0.0049 -0.1307)
OKLCH	oklch(35.51% 0.131 267.9)
XYZ	xyz(5.5783, 4.1907, 20.5894)
Luminance	0.0419 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F337F #7F6B1F

analogous

#1F637F #1F337F #3B1F7F

triadic

#1F337F #7F1F33 #337F1F

tetradic

#1F337F #7F1F63 #7F6B1F #1F7F3B

square

#1F337F #7F1F63 #7F6B1F #1F7F3B

split-complementary

#1F337F #7F3B1F #637F1F

monochromatic

#070B1D #131F4E #1F337F #2B47B0 #4664D2

Accessibility & contrast

On white

11.42

#1F337F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#1F337F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F337F

11.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F337F	#FFFFFF	#000000	##FFFFFF
##1F337F	1.00	11.42	1.84	11.42
#FFFFFF	11.42	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E82

Deuteranopia (green-blind)

#00357E

Tritanopia (blue-blind)

#004653

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f337f;
/* rgb */ color: rgb(31, 51, 127);
/* oklch */ color: oklch(35.5% 0.131 267.9);

Tailwind

colors: {
  custom: {
    50: '#696aa5',
    500: '#1f337f',
    950: '#000000',
  },
}

SCSS

$custom: #1f337f;
$custom-light: #696aa5;
$custom-dark: #000000;

JSON

{
  "hex": "#1f337f",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 127
  },
  "hsl": {
    "h": 227.5,
    "s": 60.759,
    "l": 30.98
  },
  "oklch": {
    "l": 0.35514,
    "c": 0.13084,
    "h": 267.9
  },
  "luminance": 0.04191
}

Semantic roles & 50–950 ramp

primary

#1F337F

secondary

#B29C48

accent

#C344E4

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F337F

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

Preview Lab → · Contrast checker → · Palette generator →