#1F288A#1F288A

#1F288A is a dark, vivid blue. Relative luminance 0.036; OKLCH L 34.5% C 0.160 H 270.7°. Best body text is #FFFFFF at 12.15:1 contrast (WCAG AA passes).

Color values

HEX	#1F288A
RGB	rgb(31, 40, 138)
HSL	hsl(235, 63%, 33%)
HSV	hsv(235, 78%, 54%)
CMYK	cmyk(77.5%, 71%, 0%, 45.9%)
CIE-LAB	lab(22.45, 32.33, -55.23)
CIE-LCH	lch(22.45, 64.00, 300.34°)
OKLab	oklab(34.48% 0.0021 -0.1598)
OKLCH	oklch(34.48% 0.16 270.7)
XYZ	xyz(5.9097, 3.6432, 24.4316)
Luminance	0.0364 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F288A #8A811F

analogous

#1F5D8A #1F288A #4B1F8A

triadic

#1F288A #8A1F28 #288A1F

tetradic

#1F288A #8A1F5D #8A811F #1F8A4B

square

#1F288A #8A1F5D #8A811F #1F8A4B

split-complementary

#1F288A #8A4B1F #5D8A1F

monochromatic

#090B26 #141A58 #1F288A #2A36BC #4C58D7

Accessibility & contrast

On white

12.15

#1F288A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.73

#1F288A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F288A

12.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F288A	#FFFFFF	#000000	##FFFFFF
##1F288A	1.00	12.15	1.73	12.15
#FFFFFF	12.15	1.00	21.00	1.00
#000000	1.73	21.00	1.00	21.00
##FFFFFF	12.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B8D

Deuteranopia (green-blind)

#003188

Tritanopia (blue-blind)

#004356

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1f288a;
/* rgb */ color: rgb(31, 40, 138);
/* oklch */ color: oklch(34.5% 0.160 270.7);

Tailwind

colors: {
  custom: {
    50: '#6d62ad',
    500: '#1f288a',
    950: '#000000',
  },
}

SCSS

$custom: #1f288a;
$custom-light: #6d62ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f288a",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 138
  },
  "hsl": {
    "h": 234.953,
    "s": 63.314,
    "l": 33.137
  },
  "oklch": {
    "l": 0.34476,
    "c": 0.15986,
    "h": 270.7
  },
  "luminance": 0.03644
}

Semantic roles & 50–950 ramp

primary

#1F288A

secondary

#BAB04B

accent

#D841E6

background

#F7F5FA

surface

#EDEAF4

border

#C8C6CE

text

#080510

muted

#7B797F

Preview Lab

Preview with #1F288A

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

Preview Lab → · Contrast checker → · Palette generator →