#1F288C#1F288C

#1F288C is a dark, vivid blue. Relative luminance 0.037; OKLCH L 34.7% C 0.163 H 270.6°. Best body text is #FFFFFF at 12.07:1 contrast (WCAG AA passes).

Color values

HEX	#1F288C
RGB	rgb(31, 40, 140)
HSL	hsl(235, 64%, 34%)
HSV	hsv(235, 78%, 55%)
CMYK	cmyk(77.9%, 71.4%, 0%, 45.1%)
CIE-LAB	lab(22.66, 33.07, -56.14)
CIE-LCH	lch(22.66, 65.16, 300.50°)
OKLab	oklab(34.69% 0.0018 -0.1625)
OKLCH	oklch(34.69% 0.163 270.6)
XYZ	xyz(6.0559, 3.7017, 25.2012)
Luminance	0.0370 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F288C #8C831F

analogous

#1F5E8C #1F288C #4C1F8C

triadic

#1F288C #8C1F28 #288C1F

tetradic

#1F288C #8C1F5E #8C831F #1F8C4C

square

#1F288C #8C1F5E #8C831F #1F8C4C

split-complementary

#1F288C #8C4C1F #5E8C1F

monochromatic

#090B28 #141A5A #1F288C #2A36BE #4E59D8

Accessibility & contrast

On white

12.07

#1F288C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.74

#1F288C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F288C

12.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F288C	#FFFFFF	#000000	##FFFFFF
##1F288C	1.00	12.07	1.74	12.07
#FFFFFF	12.07	1.00	21.00	1.00
#000000	1.74	21.00	1.00	21.00
##FFFFFF	12.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B8F

Deuteranopia (green-blind)

#00318A

Tritanopia (blue-blind)

#004457

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1f288c;
/* rgb */ color: rgb(31, 40, 140);
/* oklch */ color: oklch(34.7% 0.163 270.6);

Tailwind

colors: {
  custom: {
    50: '#6e62af',
    500: '#1f288c',
    950: '#000000',
  },
}

SCSS

$custom: #1f288c;
$custom-light: #6e62af;
$custom-dark: #000000;

JSON

{
  "hex": "#1f288c",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 140
  },
  "hsl": {
    "h": 235.046,
    "s": 63.743,
    "l": 33.529
  },
  "oklch": {
    "l": 0.34685,
    "c": 0.16252,
    "h": 270.6
  },
  "luminance": 0.03702
}

Semantic roles & 50–950 ramp

primary

#1F288C

secondary

#BBB14C

accent

#D941E7

background

#F7F5FA

surface

#EDEAF5

border

#C8C6CF

text

#080510

muted

#7B797F

Preview Lab

Preview with #1F288C

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

Preview Lab → · Contrast checker → · Palette generator →