#1B399D#1B399D

#1B399D is a dark, vivid blue. Relative luminance 0.056; OKLCH L 39.3% C 0.166 H 265.8°. Best body text is #FFFFFF at 9.91:1 contrast (WCAG AA passes).

Color values

HEX	#1B399D
RGB	rgb(27, 57, 157)
HSL	hsl(226, 71%, 36%)
HSV	hsv(226, 83%, 62%)
CMYK	cmyk(82.8%, 63.7%, 0%, 38.4%)
CIE-LAB	lab(28.36, 27.90, -57.25)
CIE-LCH	lch(28.36, 63.68, 295.99°)
OKLab	oklab(39.31% -0.012 -0.1657)
OKLCH	oklch(39.31% 0.166 265.8)
XYZ	xyz(7.9988, 5.5926, 32.5497)
Luminance	0.0559 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B399D #9D7F1B

analogous

#1B7A9D #1B399D #3E1B9D

triadic

#1B399D #9D1B39 #399D1B

tetradic

#1B399D #9D1B7A #9D7F1B #1B9D3E

square

#1B399D #9D1B7A #9D7F1B #1B9D3E

split-complementary

#1B399D #9D3E1B #7A9D1B

monochromatic

#091335 #122669 #1B399D #244CD1 #5172E1

Accessibility & contrast

On white

9.91

#1B399D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#1B399D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B399D

9.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B399D	#FFFFFF	#000000	##FFFFFF
##1B399D	1.00	9.91	2.12	9.91
#FFFFFF	9.91	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0049A0

Deuteranopia (green-blind)

#003D9B

Tritanopia (blue-blind)

#005365

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1b399d;
/* rgb */ color: rgb(27, 57, 157);
/* oklch */ color: oklch(39.3% 0.166 265.8);

Tailwind

colors: {
  custom: {
    50: '#706fbb',
    500: '#1b399d',
    950: '#000000',
  },
}

SCSS

$custom: #1b399d;
$custom-light: #706fbb;
$custom-dark: #000000;

JSON

{
  "hex": "#1b399d",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 157
  },
  "hsl": {
    "h": 226.154,
    "s": 70.652,
    "l": 36.078
  },
  "oklch": {
    "l": 0.39305,
    "c": 0.16614,
    "h": 265.8
  },
  "luminance": 0.05594
}

Semantic roles & 50–950 ramp

primary

#1B399D

secondary

#C4A950

accent

#C43AED

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B399D

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

Preview Lab → · Contrast checker → · Palette generator →