#1F288D#1F288D

#1F288D is a dark, vivid blue. Relative luminance 0.037; OKLCH L 34.8% C 0.164 H 270.6°. Best body text is #FFFFFF at 12.02:1 contrast (WCAG AA passes).

Color values

HEX	#1F288D
RGB	rgb(31, 40, 141)
HSL	hsl(235, 64%, 34%)
HSV	hsv(235, 78%, 55%)
CMYK	cmyk(78%, 71.6%, 0%, 44.7%)
CIE-LAB	lab(22.76, 33.43, -56.59)
CIE-LCH	lch(22.76, 65.73, 300.57°)
OKLab	oklab(34.79% 0.0017 -0.1638)
OKLCH	oklch(34.79% 0.164 270.6)
XYZ	xyz(6.1299, 3.7313, 25.5913)
Luminance	0.0373 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F288D #8D841F

analogous

#1F5F8D #1F288D #4D1F8D

triadic

#1F288D #8D1F28 #288D1F

tetradic

#1F288D #8D1F5F #8D841F #1F8D4D

square

#1F288D #8D1F5F #8D841F #1F8D4D

split-complementary

#1F288D #8D4D1F #5F8D1F

monochromatic

#090C29 #141A5B #1F288D #2A36BF #4E5AD8

Accessibility & contrast

On white

12.02

#1F288D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.75

#1F288D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F288D

12.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F288D	#FFFFFF	#000000	##FFFFFF
##1F288D	1.00	12.02	1.75	12.02
#FFFFFF	12.02	1.00	21.00	1.00
#000000	1.75	21.00	1.00	21.00
##FFFFFF	12.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C90

Deuteranopia (green-blind)

#00318B

Tritanopia (blue-blind)

#004457

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1f288d;
/* rgb */ color: rgb(31, 40, 141);
/* oklch */ color: oklch(34.8% 0.164 270.6);

Tailwind

colors: {
  custom: {
    50: '#6e62af',
    500: '#1f288d',
    950: '#000000',
  },
}

SCSS

$custom: #1f288d;
$custom-light: #6e62af;
$custom-dark: #000000;

JSON

{
  "hex": "#1f288d",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 141
  },
  "hsl": {
    "h": 235.091,
    "s": 63.953,
    "l": 33.725
  },
  "oklch": {
    "l": 0.3479,
    "c": 0.16384,
    "h": 270.6
  },
  "luminance": 0.03732
}

Semantic roles & 50–950 ramp

primary

#1F288D

secondary

#BBB24D

accent

#D941E7

background

#F7F5FA

surface

#EDEAF5

border

#C8C6CF

text

#080511

muted

#7B7980

Preview Lab

Preview with #1F288D

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

Preview Lab → · Contrast checker → · Palette generator →