#1F337B#1F337B

#1F337B is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.2% C 0.125 H 267.7°. Best body text is #FFFFFF at 11.55:1 contrast (WCAG AA passes).

Color values

HEX	#1F337B
RGB	rgb(31, 51, 123)
HSL	hsl(227, 60%, 30%)
HSV	hsv(227, 75%, 48%)
CMYK	cmyk(74.8%, 58.5%, 0%, 51.8%)
CIE-LAB	lab(23.96, 19.05, -43.34)
CIE-LCH	lch(23.96, 47.34, 293.72°)
OKLab	oklab(35.16% -0.0051 -0.1249)
OKLCH	oklch(35.16% 0.125 267.7)
XYZ	xyz(5.3228, 4.0885, 19.2437)
Luminance	0.0409 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F337B #7B671F

analogous

#1F617B #1F337B #391F7B

triadic

#1F337B #7B1F33 #337B1F

tetradic

#1F337B #7B1F61 #7B671F #1F7B39

square

#1F337B #7B1F61 #7B671F #1F7B39

split-complementary

#1F337B #7B391F #617B1F

monochromatic

#060A19 #131F4A #1F337B #2B47AC #4463D0

Accessibility & contrast

On white

11.55

#1F337B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.82

#1F337B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F337B

11.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F337B	#FFFFFF	#000000	##FFFFFF
##1F337B	1.00	11.55	1.82	11.55
#FFFFFF	11.55	1.00	21.00	1.00
#000000	1.82	21.00	1.00	21.00
##FFFFFF	11.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D7D

Deuteranopia (green-blind)

#00357A

Tritanopia (blue-blind)

#004551

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1f337b;
/* rgb */ color: rgb(31, 51, 123);
/* oklch */ color: oklch(35.2% 0.125 267.7);

Tailwind

colors: {
  custom: {
    50: '#686aa2',
    500: '#1f337b',
    950: '#000000',
  },
}

SCSS

$custom: #1f337b;
$custom-light: #686aa2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f337b",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 123
  },
  "hsl": {
    "h": 226.957,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.35163,
    "c": 0.125,
    "h": 267.7
  },
  "luminance": 0.04089
}

Semantic roles & 50–950 ramp

primary

#1F337B

secondary

#AE9848

accent

#C145E3

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F337B

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

Preview Lab → · Contrast checker → · Palette generator →