#1B398B#1B398B

#1B398B is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.7% C 0.141 H 265.0°. Best body text is #FFFFFF at 10.48:1 contrast (WCAG AA passes).

Color values

HEX	#1B398B
RGB	rgb(27, 57, 139)
HSL	hsl(224, 67%, 33%)
HSV	hsv(224, 81%, 55%)
CMYK	cmyk(80.6%, 59%, 0%, 45.5%)
CIE-LAB	lab(26.80, 20.76, -48.75)
CIE-LCH	lch(26.80, 52.99, 293.07°)
OKLab	oklab(37.66% -0.0124 -0.1408)
OKLCH	oklch(37.66% 0.141 265)
XYZ	xyz(6.5737, 5.0226, 25.0441)
Luminance	0.0502 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B398B #8B6D1B

analogous

#1B718B #1B398B #351B8B

triadic

#1B398B #8B1B39 #398B1B

tetradic

#1B398B #8B1B71 #8B6D1B #1B8B35

square

#1B398B #8B1B71 #8B6D1B #1B8B35

split-complementary

#1B398B #8B351B #718B1B

monochromatic

#070F25 #112458 #1B398B #254EBE #456DDB

Accessibility & contrast

On white

10.48

#1B398B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1B398B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B398B

10.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B398B	#FFFFFF	#000000	##FFFFFF
##1B398B	1.00	10.48	2.00	10.48
#FFFFFF	10.48	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458E

Deuteranopia (green-blind)

#003A89

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b398b;
/* rgb */ color: rgb(27, 57, 139);
/* oklch */ color: oklch(37.7% 0.141 265.0);

Tailwind

colors: {
  custom: {
    50: '#6b6eae',
    500: '#1b398b',
    950: '#000000',
  },
}

SCSS

$custom: #1b398b;
$custom-light: #6b6eae;
$custom-dark: #000000;

JSON

{
  "hex": "#1b398b",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 139
  },
  "hsl": {
    "h": 223.929,
    "s": 67.47,
    "l": 32.549
  },
  "oklch": {
    "l": 0.37657,
    "c": 0.14133,
    "h": 265
  },
  "luminance": 0.05023
}

Semantic roles & 50–950 ramp

primary

#1B398B

secondary

#BC9D45

accent

#BC3DEA

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1B398B

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

Preview Lab → · Contrast checker → · Palette generator →