#1F337A#1F337A

#1F337A is a dark, vivid blue. Relative luminance 0.041; OKLCH L 35.1% C 0.124 H 267.6°. Best body text is #FFFFFF at 11.58:1 contrast (WCAG AA passes).

Color values

HEX	#1F337A
RGB	rgb(31, 51, 122)
HSL	hsl(227, 59%, 30%)
HSV	hsv(227, 75%, 48%)
CMYK	cmyk(74.6%, 58.2%, 0%, 52.2%)
CIE-LAB	lab(23.88, 18.65, -42.84)
CIE-LCH	lch(23.88, 46.72, 293.52°)
OKLab	oklab(35.08% -0.0051 -0.1234)
OKLCH	oklch(35.08% 0.124 267.6)
XYZ	xyz(5.2605, 4.0636, 18.9157)
Luminance	0.0406 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F337A #7A661F

analogous

#1F617A #1F337A #381F7A

triadic

#1F337A #7A1F33 #337A1F

tetradic

#1F337A #7A1F61 #7A661F #1F7A38

square

#1F337A #7A1F61 #7A661F #1F7A38

split-complementary

#1F337A #7A381F #617A1F

monochromatic

#060A18 #131F49 #1F337A #2B47AB #4463CF

Accessibility & contrast

On white

11.58

#1F337A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#1F337A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F337A

11.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F337A	#FFFFFF	#000000	##FFFFFF
##1F337A	1.00	11.58	1.81	11.58
#FFFFFF	11.58	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003D7C

Deuteranopia (green-blind)

#003579

Tritanopia (blue-blind)

#004451

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1f337a;
/* rgb */ color: rgb(31, 51, 122);
/* oklch */ color: oklch(35.1% 0.124 267.6);

Tailwind

colors: {
  custom: {
    50: '#686aa1',
    500: '#1f337a',
    950: '#000000',
  },
}

SCSS

$custom: #1f337a;
$custom-light: #686aa1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f337a",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 122
  },
  "hsl": {
    "h": 226.813,
    "s": 59.477,
    "l": 30
  },
  "oklch": {
    "l": 0.35076,
    "c": 0.12354,
    "h": 267.6
  },
  "luminance": 0.04064
}

Semantic roles & 50–950 ramp

primary

#1F337A

secondary

#AD9747

accent

#C045E3

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1F337A

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

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