#1B288F#1B288F

#1B288F is a dark, vivid blue. Relative luminance 0.037; OKLCH L 34.8% C 0.168 H 269.1°. Best body text is #FFFFFF at 12.02:1 contrast (WCAG AA passes).

Color values

HEX	#1B288F
RGB	rgb(27, 40, 143)
HSL	hsl(233, 68%, 33%)
HSV	hsv(233, 81%, 56%)
CMYK	cmyk(81.1%, 72%, 0%, 43.9%)
CIE-LAB	lab(22.77, 33.81, -57.83)
CIE-LCH	lch(22.77, 66.99, 300.31°)
OKLab	oklab(34.8% -0.0026 -0.1675)
OKLCH	oklch(34.8% 0.168 269.1)
XYZ	xyz(6.1670, 3.7331, 26.3768)
Luminance	0.0373 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B288F #8F821B

analogous

#1B628F #1B288F #481B8F

triadic

#1B288F #8F1B28 #288F1B

tetradic

#1B288F #8F1B62 #8F821B #1B8F48

square

#1B288F #8F1B62 #8F821B #1B8F48

split-complementary

#1B288F #8F481B #628F1B

monochromatic

#080B28 #111A5C #1B288F #2536C2 #4859DC

Accessibility & contrast

On white

12.02

#1B288F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.75

#1B288F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B288F

12.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B288F	#FFFFFF	#000000	##FFFFFF
##1B288F	1.00	12.02	1.75	12.02
#FFFFFF	12.02	1.00	21.00	1.00
#000000	1.75	21.00	1.00	21.00
##FFFFFF	12.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C92

Deuteranopia (green-blind)

#00318D

Tritanopia (blue-blind)

#004558

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b288f;
/* rgb */ color: rgb(27, 40, 143);
/* oklch */ color: oklch(34.8% 0.168 269.1);

Tailwind

colors: {
  custom: {
    50: '#6d62b1',
    500: '#1b288f',
    950: '#000000',
  },
}

SCSS

$custom: #1b288f;
$custom-light: #6d62b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b288f",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 143
  },
  "hsl": {
    "h": 233.276,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.34802,
    "c": 0.16754,
    "h": 269.1
  },
  "luminance": 0.03734
}

Semantic roles & 50–950 ramp

primary

#1B288F

secondary

#BEB148

accent

#D83DEB

background

#F7F5FB

surface

#EDEAF6

border

#C8C6D0

text

#080511

muted

#7B7980

Preview Lab

Preview with #1B288F

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

Preview Lab → · Contrast checker → · Palette generator →