#1F3387#1F3387

#1F3387 is a dark, vivid blue. Relative luminance 0.044; OKLCH L 36.2% C 0.142 H 268.1°. Best body text is #FFFFFF at 11.16:1 contrast (WCAG AA passes).

Color values

HEX	#1F3387
RGB	rgb(31, 51, 135)
HSL	hsl(228, 63%, 33%)
HSV	hsv(228, 77%, 53%)
CMYK	cmyk(77%, 62.2%, 0%, 47.1%)
CIE-LAB	lab(24.98, 23.79, -49.23)
CIE-LCH	lch(24.98, 54.68, 295.80°)
OKLab	oklab(36.24% -0.0048 -0.1422)
OKLCH	oklch(36.24% 0.142 268.1)
XYZ	xyz(6.1206, 4.4076, 23.4451)
Luminance	0.0441 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3387 #87731F

analogous

#1F6787 #1F3387 #3F1F87

triadic

#1F3387 #871F33 #33871F

tetradic

#1F3387 #871F67 #87731F #1F873F

square

#1F3387 #871F67 #87731F #1F873F

split-complementary

#1F3387 #873F1F #67871F

monochromatic

#080D23 #142055 #1F3387 #2A46B9 #4B65D6

Accessibility & contrast

On white

11.16

#1F3387 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#1F3387 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3387

11.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3387	#FFFFFF	#000000	##FFFFFF
##1F3387	1.00	11.16	1.88	11.16
#FFFFFF	11.16	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00408A

Deuteranopia (green-blind)

#003785

Tritanopia (blue-blind)

#004858

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1f3387;
/* rgb */ color: rgb(31, 51, 135);
/* oklch */ color: oklch(36.2% 0.142 268.1);

Tailwind

colors: {
  custom: {
    50: '#6c6aab',
    500: '#1f3387',
    950: '#000000',
  },
}

SCSS

$custom: #1f3387;
$custom-light: #6c6aab;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3387",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 135
  },
  "hsl": {
    "h": 228.462,
    "s": 62.651,
    "l": 32.549
  },
  "oklch": {
    "l": 0.36237,
    "c": 0.14228,
    "h": 268.1
  },
  "luminance": 0.04408
}

Semantic roles & 50–950 ramp

primary

#1F3387

secondary

#B8A34A

accent

#C642E6

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080610

muted

#7A7A7F

Preview Lab

Preview with #1F3387

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

Preview Lab → · Contrast checker → · Palette generator →