#1F3388#1F3388

#1F3388 is a dark, vivid blue. Relative luminance 0.044; OKLCH L 36.3% C 0.144 H 268.1°. Best body text is #FFFFFF at 11.13:1 contrast (WCAG AA passes).

Color values

HEX	#1F3388
RGB	rgb(31, 51, 136)
HSL	hsl(229, 63%, 33%)
HSV	hsv(229, 77%, 53%)
CMYK	cmyk(77.2%, 62.5%, 0%, 46.7%)
CIE-LAB	lab(25.06, 24.18, -49.71)
CIE-LCH	lch(25.06, 55.28, 295.94°)
OKLab	oklab(36.33% -0.0048 -0.1436)
OKLCH	oklch(36.33% 0.144 268.1)
XYZ	xyz(6.1913, 4.4359, 23.8177)
Luminance	0.0444 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3388 #88741F

analogous

#1F6888 #1F3388 #3F1F88

triadic

#1F3388 #881F33 #33881F

tetradic

#1F3388 #881F68 #88741F #1F883F

square

#1F3388 #881F68 #88741F #1F883F

split-complementary

#1F3388 #883F1F #68881F

monochromatic

#080E24 #142056 #1F3388 #2A46BA #4B66D6

Accessibility & contrast

On white

11.13

#1F3388 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#1F3388 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3388

11.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3388	#FFFFFF	#000000	##FFFFFF
##1F3388	1.00	11.13	1.89	11.13
#FFFFFF	11.13	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00408B

Deuteranopia (green-blind)

#003786

Tritanopia (blue-blind)

#004958

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1f3388;
/* rgb */ color: rgb(31, 51, 136);
/* oklch */ color: oklch(36.3% 0.144 268.1);

Tailwind

colors: {
  custom: {
    50: '#6c6aab',
    500: '#1f3388',
    950: '#000000',
  },
}

SCSS

$custom: #1f3388;
$custom-light: #6c6aab;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3388",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 136
  },
  "hsl": {
    "h": 228.571,
    "s": 62.874,
    "l": 32.745
  },
  "oklch": {
    "l": 0.36329,
    "c": 0.14369,
    "h": 268.1
  },
  "luminance": 0.04437
}

Semantic roles & 50–950 ramp

primary

#1F3388

secondary

#B9A44A

accent

#C742E6

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1F3388

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

Preview Lab → · Contrast checker → · Palette generator →