#1F287B#1F287B

#1F287B is a dark, vivid blue. Relative luminance 0.032; OKLCH L 32.9% C 0.139 H 271.4°. Best body text is #FFFFFF at 12.74:1 contrast (WCAG AA passes).

Color values

HEX	#1F287B
RGB	rgb(31, 40, 123)
HSL	hsl(234, 60%, 30%)
HSV	hsv(234, 75%, 48%)
CMYK	cmyk(74.8%, 67.5%, 0%, 51.8%)
CIE-LAB	lab(20.97, 26.69, -48.21)
CIE-LCH	lch(20.97, 55.11, 298.97°)
OKLab	oklab(32.95% 0.0035 -0.1393)
OKLCH	oklch(32.95% 0.139 271.4)
XYZ	xyz(4.8978, 3.2385, 19.1020)
Luminance	0.0324 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F287B #7B721F

analogous

#1F567B #1F287B #441F7B

triadic

#1F287B #7B1F28 #287B1F

tetradic

#1F287B #7B1F56 #7B721F #1F7B44

square

#1F287B #7B1F56 #7B721F #1F7B44

split-complementary

#1F287B #7B441F #567B1F

monochromatic

#060819 #13184A #1F287B #2B38AC #4452D0

Accessibility & contrast

On white

12.74

#1F287B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.65

#1F287B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F287B

12.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F287B	#FFFFFF	#000000	##FFFFFF
##1F287B	1.00	12.74	1.65	12.74
#FFFFFF	12.74	1.00	21.00	1.00
#000000	1.65	21.00	1.00	21.00
##FFFFFF	12.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00377E

Deuteranopia (green-blind)

#002E79

Tritanopia (blue-blind)

#003E4D

Achromatopsia (no color)

#323232

Design tokens & code

CSS

--color: #1f287b;
/* rgb */ color: rgb(31, 40, 123);
/* oklch */ color: oklch(32.9% 0.139 271.4);

Tailwind

colors: {
  custom: {
    50: '#6962a2',
    500: '#1f287b',
    950: '#000000',
  },
}

SCSS

$custom: #1f287b;
$custom-light: #6962a2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f287b",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 123
  },
  "hsl": {
    "h": 234.13,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.32949,
    "c": 0.13937,
    "h": 271.4
  },
  "luminance": 0.03239
}

Semantic roles & 50–950 ramp

primary

#1F287B

secondary

#AEA448

accent

#D345E3

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1F287B

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

Preview Lab → · Contrast checker → · Palette generator →