#1D288F#1D288F

#1D288F is a dark, vivid blue. Relative luminance 0.038; OKLCH L 34.9% C 0.167 H 269.8°. Best body text is #FFFFFF at 11.98:1 contrast (WCAG AA passes).

Color values

HEX	#1D288F
RGB	rgb(29, 40, 143)
HSL	hsl(234, 66%, 34%)
HSV	hsv(234, 80%, 56%)
CMYK	cmyk(79.7%, 72%, 0%, 43.9%)
CIE-LAB	lab(22.87, 33.98, -57.67)
CIE-LCH	lch(22.87, 66.94, 300.51°)
OKLab	oklab(34.9% -0.0006 -0.167)
OKLCH	oklch(34.9% 0.167 269.8)
XYZ	xyz(6.2217, 3.7613, 26.3794)
Luminance	0.0376 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D288F #8F841D

analogous

#1D618F #1D288F #4B1D8F

triadic

#1D288F #8F1D28 #288F1D

tetradic

#1D288F #8F1D61 #8F841D #1D8F4B

square

#1D288F #8F1D61 #8F841D #1D8F4B

split-complementary

#1D288F #8F4B1D #618F1D

monochromatic

#080C29 #131A5C #1D288F #2736C2 #4C5ADB

Accessibility & contrast

On white

11.98

#1D288F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.75

#1D288F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D288F

11.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D288F	#FFFFFF	#000000	##FFFFFF
##1D288F	1.00	11.98	1.75	11.98
#FFFFFF	11.98	1.00	21.00	1.00
#000000	1.75	21.00	1.00	21.00
##FFFFFF	11.98	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: #1d288f;
/* rgb */ color: rgb(29, 40, 143);
/* oklch */ color: oklch(34.9% 0.167 269.8);

Tailwind

colors: {
  custom: {
    50: '#6e62b1',
    500: '#1d288f',
    950: '#000000',
  },
}

SCSS

$custom: #1d288f;
$custom-light: #6e62b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1d288f",
  "rgb": {
    "r": 29,
    "g": 40,
    "b": 143
  },
  "hsl": {
    "h": 234.211,
    "s": 66.279,
    "l": 33.725
  },
  "oklch": {
    "l": 0.34899,
    "c": 0.16701,
    "h": 269.8
  },
  "luminance": 0.03762
}

Semantic roles & 50–950 ramp

primary

#1D288F

secondary

#BDB24B

accent

#D93FE9

background

#F7F5FB

surface

#EDEAF6

border

#C8C6D0

text

#080511

muted

#7B7980

Preview Lab

Preview with #1D288F

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

Preview Lab → · Contrast checker → · Palette generator →