#1F3371#1F3371

#1F3371 is a dark, moderate blue. Relative luminance 0.039; OKLCH L 34.3% C 0.110 H 267.0°. Best body text is #FFFFFF at 11.86:1 contrast (WCAG AA passes).

Color values

HEX	#1F3371
RGB	rgb(31, 51, 113)
HSL	hsl(225, 57%, 28%)
HSV	hsv(225, 73%, 44%)
CMYK	cmyk(72.6%, 54.9%, 0%, 55.7%)
CIE-LAB	lab(23.17, 15.05, -38.25)
CIE-LCH	lch(23.17, 41.11, 291.48°)
OKLab	oklab(34.32% -0.0058 -0.1099)
OKLCH	oklch(34.32% 0.11 267)
XYZ	xyz(4.7285, 3.8507, 16.1137)
Luminance	0.0385 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3371 #715D1F

analogous

#1F5C71 #1F3371 #341F71

triadic

#1F3371 #711F33 #33711F

tetradic

#1F3371 #711F5C #715D1F #1F7134

square

#1F3371 #711F5C #715D1F #1F7134

split-complementary

#1F3371 #71341F #5C711F

monochromatic

#070B18 #121D41 #1F3371 #2C49A1 #4062CB

Accessibility & contrast

On white

11.86

#1F3371 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.77

#1F3371 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3371

11.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3371	#FFFFFF	#000000	##FFFFFF
##1F3371	1.00	11.86	1.77	11.86
#FFFFFF	11.86	1.00	21.00	1.00
#000000	1.77	21.00	1.00	21.00
##FFFFFF	11.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A3B73

Deuteranopia (green-blind)

#003470

Tritanopia (blue-blind)

#00424C

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1f3371;
/* rgb */ color: rgb(31, 51, 113);
/* oklch */ color: oklch(34.3% 0.110 267.0);

Tailwind

colors: {
  custom: {
    50: '#666a9a',
    500: '#1f3371',
    950: '#000000',
  },
}

SCSS

$custom: #1f3371;
$custom-light: #666a9a;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3371",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 113
  },
  "hsl": {
    "h": 225.366,
    "s": 56.944,
    "l": 28.235
  },
  "oklch": {
    "l": 0.34317,
    "c": 0.11009,
    "h": 267
  },
  "luminance": 0.03851
}

Semantic roles & 50–950 ramp

primary

#1F3371

secondary

#A58E47

accent

#BB48E0

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060E

muted

#7A7A7E

Preview Lab

Preview with #1F3371

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

Preview Lab → · Contrast checker → · Palette generator →