#1B288C#1B288C

#1B288C is a dark, vivid blue. Relative luminance 0.036; OKLCH L 34.5% C 0.164 H 269.2°. Best body text is #FFFFFF at 12.15:1 contrast (WCAG AA passes).

Color values

HEX	#1B288C
RGB	rgb(27, 40, 140)
HSL	hsl(233, 68%, 33%)
HSV	hsv(233, 81%, 55%)
CMYK	cmyk(80.7%, 71.4%, 0%, 45.1%)
CIE-LAB	lab(22.46, 32.69, -56.48)
CIE-LCH	lch(22.46, 65.26, 300.06°)
OKLab	oklab(34.48% -0.0023 -0.1636)
OKLCH	oklch(34.48% 0.164 269.2)
XYZ	xyz(5.9428, 3.6434, 25.1959)
Luminance	0.0364 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B288C #8C7F1B

analogous

#1B618C #1B288C #461B8C

triadic

#1B288C #8C1B28 #288C1B

tetradic

#1B288C #8C1B61 #8C7F1B #1B8C46

square

#1B288C #8C1B61 #8C7F1B #1B8C46

split-complementary

#1B288C #8C461B #618C1B

monochromatic

#070B25 #111959 #1B288C #2537BF #4657DB

Accessibility & contrast

On white

12.15

#1B288C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.73

#1B288C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B288C

12.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B288C	#FFFFFF	#000000	##FFFFFF
##1B288C	1.00	12.15	1.73	12.15
#FFFFFF	12.15	1.00	21.00	1.00
#000000	1.73	21.00	1.00	21.00
##FFFFFF	12.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B8F

Deuteranopia (green-blind)

#00308A

Tritanopia (blue-blind)

#004457

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1b288c;
/* rgb */ color: rgb(27, 40, 140);
/* oklch */ color: oklch(34.5% 0.164 269.2);

Tailwind

colors: {
  custom: {
    50: '#6d62af',
    500: '#1b288c',
    950: '#000000',
  },
}

SCSS

$custom: #1b288c;
$custom-light: #6d62af;
$custom-dark: #000000;

JSON

{
  "hex": "#1b288c",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 140
  },
  "hsl": {
    "h": 233.097,
    "s": 67.665,
    "l": 32.745
  },
  "oklch": {
    "l": 0.34482,
    "c": 0.16361,
    "h": 269.2
  },
  "luminance": 0.03644
}

Semantic roles & 50–950 ramp

primary

#1B288C

secondary

#BDAF46

accent

#D73DEB

background

#F7F5FA

surface

#EDEAF5

border

#C8C6CF

text

#080510

muted

#7B797F

Preview Lab

Preview with #1B288C

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

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