#1F287D#1F287D

#1F287D is a dark, vivid blue. Relative luminance 0.033; OKLCH L 33.1% C 0.142 H 271.4°. Best body text is #FFFFFF at 12.67:1 contrast (WCAG AA passes).

Color values

HEX	#1F287D
RGB	rgb(31, 40, 125)
HSL	hsl(234, 60%, 31%)
HSV	hsv(234, 75%, 49%)
CMYK	cmyk(75.2%, 68%, 0%, 51%)
CIE-LAB	lab(21.17, 27.45, -49.17)
CIE-LCH	lch(21.17, 56.31, 299.18°)
OKLab	oklab(33.15% 0.0034 -0.1421)
OKLCH	oklch(33.15% 0.142 271.4)
XYZ	xyz(5.0243, 3.2890, 19.7681)
Luminance	0.0329 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F287D #7D741F

analogous

#1F577D #1F287D #451F7D

triadic

#1F287D #7D1F28 #287D1F

tetradic

#1F287D #7D1F57 #7D741F #1F7D45

square

#1F287D #7D1F57 #7D741F #1F7D45

split-complementary

#1F287D #7D451F #577D1F

monochromatic

#07091B #13184C #1F287D #2B38AE #4553D1

Accessibility & contrast

On white

12.67

#1F287D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.66

#1F287D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F287D

12.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F287D	#FFFFFF	#000000	##FFFFFF
##1F287D	1.00	12.67	1.66	12.67
#FFFFFF	12.67	1.00	21.00	1.00
#000000	1.66	21.00	1.00	21.00
##FFFFFF	12.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003780

Deuteranopia (green-blind)

#002E7B

Tritanopia (blue-blind)

#003F4E

Achromatopsia (no color)

#333333

Design tokens & code

CSS

--color: #1f287d;
/* rgb */ color: rgb(31, 40, 125);
/* oklch */ color: oklch(33.1% 0.142 271.4);

Tailwind

colors: {
  custom: {
    50: '#6a62a4',
    500: '#1f287d',
    950: '#000000',
  },
}

SCSS

$custom: #1f287d;
$custom-light: #6a62a4;
$custom-dark: #000000;

JSON

{
  "hex": "#1f287d",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 125
  },
  "hsl": {
    "h": 234.255,
    "s": 60.256,
    "l": 30.588
  },
  "oklch": {
    "l": 0.33147,
    "c": 0.14217,
    "h": 271.4
  },
  "luminance": 0.0329
}

Semantic roles & 50–950 ramp

primary

#1F287D

secondary

#B0A648

accent

#D444E3

background

#F6F5FA

surface

#ECEAF4

border

#C7C6CE

text

#07050F

muted

#7A797F

Preview Lab

Preview with #1F287D

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

Preview Lab → · Contrast checker → · Palette generator →