#1B238F#1B238F

#1B238F is a dark, vivid blue. Relative luminance 0.034; OKLCH L 34.0% C 0.173 H 269.8°. Best body text is #FFFFFF at 12.47:1 contrast (WCAG AA passes).

Color values

HEX	#1B238F
RGB	rgb(27, 35, 143)
HSL	hsl(236, 68%, 33%)
HSV	hsv(236, 81%, 56%)
CMYK	cmyk(81.1%, 75.5%, 0%, 43.9%)
CIE-LAB	lab(21.64, 36.93, -59.69)
CIE-LCH	lch(21.64, 70.19, 301.74°)
OKLab	oklab(34% -0.0005 -0.1729)
OKLCH	oklch(34% 0.173 269.8)
XYZ	xyz(6.0093, 3.4176, 26.3242)
Luminance	0.0342 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B238F #8F871B

analogous

#1B5D8F #1B238F #4D1B8F

triadic

#1B238F #8F1B23 #238F1B

tetradic

#1B238F #8F1B5D #8F871B #1B8F4D

square

#1B238F #8F1B5D #8F871B #1B8F4D

split-complementary

#1B238F #8F4D1B #5D8F1B

monochromatic

#080A28 #11165C #1B238F #2530C2 #4852DC

Accessibility & contrast

On white

12.47

#1B238F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.68

#1B238F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B238F

12.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B238F	#FFFFFF	#000000	##FFFFFF
##1B238F	1.00	12.47	1.68	12.47
#FFFFFF	12.47	1.00	21.00	1.00
#000000	1.68	21.00	1.00	21.00
##FFFFFF	12.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003A92

Deuteranopia (green-blind)

#002E8D

Tritanopia (blue-blind)

#004357

Achromatopsia (no color)

#343434

Design tokens & code

CSS

--color: #1b238f;
/* rgb */ color: rgb(27, 35, 143);
/* oklch */ color: oklch(34.0% 0.173 269.8);

Tailwind

colors: {
  custom: {
    50: '#6e5fb1',
    500: '#1b238f',
    950: '#000000',
  },
}

SCSS

$custom: #1b238f;
$custom-light: #6e5fb1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b238f",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 143
  },
  "hsl": {
    "h": 235.862,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.33996,
    "c": 0.1729,
    "h": 269.8
  },
  "luminance": 0.03418
}

Semantic roles & 50–950 ramp

primary

#1B238F

secondary

#BEB648

accent

#DF3DEB

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090411

muted

#7B7980

Preview Lab

Preview with #1B238F

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

Preview Lab → · Contrast checker → · Palette generator →