#1F287C#1F287C

#1F287C is a dark, vivid blue. Relative luminance 0.033; OKLCH L 33.0% C 0.141 H 271.4°. Best body text is #FFFFFF at 12.71:1 contrast (WCAG AA passes).

Color values

HEX	#1F287C
RGB	rgb(31, 40, 124)
HSL	hsl(234, 60%, 30%)
HSV	hsv(234, 75%, 49%)
CMYK	cmyk(75%, 67.7%, 0%, 51.4%)
CIE-LAB	lab(21.07, 27.07, -48.69)
CIE-LCH	lch(21.07, 55.71, 299.07°)
OKLab	oklab(33.05% 0.0034 -0.1407)
OKLCH	oklch(33.05% 0.141 271.4)
XYZ	xyz(4.9607, 3.2636, 19.4334)
Luminance	0.0326 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F287C #7C731F

analogous

#1F567C #1F287C #451F7C

triadic

#1F287C #7C1F28 #287C1F

tetradic

#1F287C #7C1F56 #7C731F #1F7C45

square

#1F287C #7C1F56 #7C731F #1F7C45

split-complementary

#1F287C #7C451F #567C1F

monochromatic

#07081A #13184B #1F287C #2B38AD #4552D0

Accessibility & contrast

On white

12.71

#1F287C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.65

#1F287C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F287C

12.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F287C	#FFFFFF	#000000	##FFFFFF
##1F287C	1.00	12.71	1.65	12.71
#FFFFFF	12.71	1.00	21.00	1.00
#000000	1.65	21.00	1.00	21.00
##FFFFFF	12.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00377F

Deuteranopia (green-blind)

#002E7A

Tritanopia (blue-blind)

#003E4E

Achromatopsia (no color)

#333333

Design tokens & code

CSS

--color: #1f287c;
/* rgb */ color: rgb(31, 40, 124);
/* oklch */ color: oklch(33.0% 0.141 271.4);

Tailwind

colors: {
  custom: {
    50: '#6a62a3',
    500: '#1f287c',
    950: '#000000',
  },
}

SCSS

$custom: #1f287c;
$custom-light: #6a62a3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f287c",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 124
  },
  "hsl": {
    "h": 234.194,
    "s": 60,
    "l": 30.392
  },
  "oklch": {
    "l": 0.33048,
    "c": 0.14078,
    "h": 271.4
  },
  "luminance": 0.03264
}

Semantic roles & 50–950 ramp

primary

#1F287C

secondary

#AFA548

accent

#D445E3

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1F287C

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

Preview Lab → · Contrast checker → · Palette generator →