#1B398C#1B398C

#1B398C is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.7% C 0.143 H 265.0°. Best body text is #FFFFFF at 10.44:1 contrast (WCAG AA passes).

Color values

HEX	#1B398C
RGB	rgb(27, 57, 140)
HSL	hsl(224, 68%, 33%)
HSV	hsv(224, 81%, 55%)
CMYK	cmyk(80.7%, 59.3%, 0%, 45.1%)
CIE-LAB	lab(26.88, 21.16, -49.23)
CIE-LCH	lch(26.88, 53.59, 293.26°)
OKLab	oklab(37.74% -0.0124 -0.1422)
OKLCH	oklch(37.74% 0.143 265)
XYZ	xyz(6.6471, 5.0519, 25.4307)
Luminance	0.0505 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B398C #8C6E1B

analogous

#1B718C #1B398C #361B8C

triadic

#1B398C #8C1B39 #398C1B

tetradic

#1B398C #8C1B71 #8C6E1B #1B8C36

square

#1B398C #8C1B71 #8C6E1B #1B8C36

split-complementary

#1B398C #8C361B #718C1B

monochromatic

#070F25 #112459 #1B398C #254EBF #466EDB

Accessibility & contrast

On white

10.44

#1B398C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#1B398C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B398C

10.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B398C	#FFFFFF	#000000	##FFFFFF
##1B398C	1.00	10.44	2.01	10.44
#FFFFFF	10.44	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458F

Deuteranopia (green-blind)

#003A8A

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b398c;
/* rgb */ color: rgb(27, 57, 140);
/* oklch */ color: oklch(37.7% 0.143 265.0);

Tailwind

colors: {
  custom: {
    50: '#6b6eae',
    500: '#1b398c',
    950: '#000000',
  },
}

SCSS

$custom: #1b398c;
$custom-light: #6b6eae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b398c",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 140
  },
  "hsl": {
    "h": 224.071,
    "s": 67.665,
    "l": 32.745
  },
  "oklch": {
    "l": 0.37745,
    "c": 0.14274,
    "h": 265
  },
  "luminance": 0.05053
}

Semantic roles & 50–950 ramp

primary

#1B398C

secondary

#BD9D46

accent

#BD3DEB

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B398C

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

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