#1F3383#1F3383

#1F3383 is a dark, vivid blue. Relative luminance 0.043; OKLCH L 35.9% C 0.137 H 268.0°. Best body text is #FFFFFF at 11.29:1 contrast (WCAG AA passes).

Color values

HEX	#1F3383
RGB	rgb(31, 51, 131)
HSL	hsl(228, 62%, 32%)
HSV	hsv(228, 76%, 51%)
CMYK	cmyk(76.3%, 61.1%, 0%, 48.6%)
CIE-LAB	lab(24.63, 22.22, -47.29)
CIE-LCH	lch(24.63, 52.25, 295.17°)
OKLab	oklab(35.87% -0.0048 -0.1365)
OKLCH	oklch(35.87% 0.137 268)
XYZ	xyz(5.8442, 4.2970, 21.9897)
Luminance	0.0430 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3383 #836F1F

analogous

#1F6583 #1F3383 #3D1F83

triadic

#1F3383 #831F33 #33831F

tetradic

#1F3383 #831F65 #836F1F #1F833D

square

#1F3383 #831F65 #836F1F #1F833D

split-complementary

#1F3383 #833D1F #65831F

monochromatic

#080C20 #132052 #1F3383 #2B46B4 #4964D4

Accessibility & contrast

On white

11.29

#1F3383 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#1F3383 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3383

11.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3383	#FFFFFF	#000000	##FFFFFF
##1F3383	1.00	11.29	1.86	11.29
#FFFFFF	11.29	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F86

Deuteranopia (green-blind)

#003681

Tritanopia (blue-blind)

#004755

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f3383;
/* rgb */ color: rgb(31, 51, 131);
/* oklch */ color: oklch(35.9% 0.137 268.0);

Tailwind

colors: {
  custom: {
    50: '#6a6aa8',
    500: '#1f3383',
    950: '#000000',
  },
}

SCSS

$custom: #1f3383;
$custom-light: #6a6aa8;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3383",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 131
  },
  "hsl": {
    "h": 228,
    "s": 61.728,
    "l": 31.765
  },
  "oklch": {
    "l": 0.35872,
    "c": 0.13659,
    "h": 268
  },
  "luminance": 0.04298
}

Semantic roles & 50–950 ramp

primary

#1F3383

secondary

#B6A048

accent

#C443E5

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#070610

muted

#7A7A7F

Preview Lab

Preview with #1F3383

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

Preview Lab → · Contrast checker → · Palette generator →