#1F288F#1F288F

#1F288F is a dark, vivid blue. Relative luminance 0.038; OKLCH L 35.0% C 0.166 H 270.5°. Best body text is #FFFFFF at 11.94:1 contrast (WCAG AA passes).

Color values

HEX	#1F288F
RGB	rgb(31, 40, 143)
HSL	hsl(235, 64%, 34%)
HSV	hsv(235, 78%, 56%)
CMYK	cmyk(78.3%, 72%, 0%, 43.9%)
CIE-LAB	lab(22.97, 34.17, -57.50)
CIE-LCH	lch(22.97, 66.88, 300.72°)
OKLab	oklab(35% 0.0015 -0.1665)
OKLCH	oklch(35% 0.166 270.5)
XYZ	xyz(6.2801, 3.7914, 26.3821)
Luminance	0.0379 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F288F #8F861F

analogous

#1F608F #1F288F #4E1F8F

triadic

#1F288F #8F1F28 #288F1F

tetradic

#1F288F #8F1F60 #8F861F #1F8F4E

square

#1F288F #8F1F60 #8F861F #1F8F4E

split-complementary

#1F288F #8F4E1F #608F1F

monochromatic

#090C2A #141A5D #1F288F #2A36C1 #4F5BD9

Accessibility & contrast

On white

11.94

#1F288F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.76

#1F288F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F288F

11.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F288F	#FFFFFF	#000000	##FFFFFF
##1F288F	1.00	11.94	1.76	11.94
#FFFFFF	11.94	1.00	21.00	1.00
#000000	1.76	21.00	1.00	21.00
##FFFFFF	11.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C92

Deuteranopia (green-blind)

#00318D

Tritanopia (blue-blind)

#004558

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1f288f;
/* rgb */ color: rgb(31, 40, 143);
/* oklch */ color: oklch(35.0% 0.166 270.5);

Tailwind

colors: {
  custom: {
    50: '#6f62b1',
    500: '#1f288f',
    950: '#000000',
  },
}

SCSS

$custom: #1f288f;
$custom-light: #6f62b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f288f",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 143
  },
  "hsl": {
    "h": 235.179,
    "s": 64.368,
    "l": 34.118
  },
  "oklch": {
    "l": 0.35002,
    "c": 0.16647,
    "h": 270.5
  },
  "luminance": 0.03792
}

Semantic roles & 50–950 ramp

primary

#1F288F

secondary

#BCB34E

accent

#DA40E7

background

#F7F5FB

surface

#EDEAF6

border

#C8C6D0

text

#090511

muted

#7B7980

Preview Lab

Preview with #1F288F

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

Preview Lab → · Contrast checker → · Palette generator →