#1B398F#1B398F

#1B398F is a dark, vivid blue. Relative luminance 0.051; OKLCH L 38.0% C 0.147 H 265.2°. Best body text is #FFFFFF at 10.35:1 contrast (WCAG AA passes).

Color values

HEX	#1B398F
RGB	rgb(27, 57, 143)
HSL	hsl(224, 68%, 33%)
HSV	hsv(224, 81%, 56%)
CMYK	cmyk(81.1%, 60.1%, 0%, 43.9%)
CIE-LAB	lab(27.13, 22.37, -50.68)
CIE-LCH	lch(27.13, 55.39, 293.82°)
OKLab	oklab(38.01% -0.0122 -0.1464)
OKLCH	oklch(38.01% 0.147 265.2)
XYZ	xyz(6.8713, 5.1416, 26.6116)
Luminance	0.0514 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B398F #8F711B

analogous

#1B738F #1B398F #371B8F

triadic

#1B398F #8F1B39 #398F1B

tetradic

#1B398F #8F1B73 #8F711B #1B8F37

square

#1B398F #8F1B73 #8F711B #1B8F37

split-complementary

#1B398F #8F371B #738F1B

monochromatic

#081028 #11245C #1B398F #254EC2 #486EDC

Accessibility & contrast

On white

10.35

#1B398F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#1B398F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B398F

10.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B398F	#FFFFFF	#000000	##FFFFFF
##1B398F	1.00	10.35	2.03	10.35
#FFFFFF	10.35	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004692

Deuteranopia (green-blind)

#003B8D

Tritanopia (blue-blind)

#004F5E

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1b398f;
/* rgb */ color: rgb(27, 57, 143);
/* oklch */ color: oklch(38.0% 0.147 265.2);

Tailwind

colors: {
  custom: {
    50: '#6c6eb1',
    500: '#1b398f',
    950: '#000000',
  },
}

SCSS

$custom: #1b398f;
$custom-light: #6c6eb1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b398f",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 143
  },
  "hsl": {
    "h": 224.483,
    "s": 68.235,
    "l": 33.333
  },
  "oklch": {
    "l": 0.38013,
    "c": 0.14695,
    "h": 265.2
  },
  "luminance": 0.05142
}

Semantic roles & 50–950 ramp

primary

#1B398F

secondary

#BEA048

accent

#BE3DEB

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1B398F

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

Preview Lab → · Contrast checker → · Palette generator →