#1B379F#1B379F

#1B379F is a dark, vivid blue. Relative luminance 0.055; OKLCH L 39.1% C 0.171 H 266.3°. Best body text is #FFFFFF at 10.03:1 contrast (WCAG AA passes).

Color values

HEX	#1B379F
RGB	rgb(27, 55, 159)
HSL	hsl(227, 71%, 36%)
HSV	hsv(227, 83%, 62%)
CMYK	cmyk(83%, 65.4%, 0%, 37.6%)
CIE-LAB	lab(28.03, 30.02, -59.01)
CIE-LCH	lch(28.03, 66.21, 296.97°)
OKLab	oklab(39.12% -0.011 -0.1709)
OKLCH	oklch(39.12% 0.171 266.3)
XYZ	xyz(8.0740, 5.4676, 33.4240)
Luminance	0.0547 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B379F #9F831B

analogous

#1B799F #1B379F #411B9F

triadic

#1B379F #9F1B37 #379F1B

tetradic

#1B379F #9F1B79 #9F831B #1B9F41

square

#1B379F #9F1B79 #9F831B #1B9F41

split-complementary

#1B379F #9F411B #799F1B

monochromatic

#091336 #12256B #1B379F #2449D3 #5371E2

Accessibility & contrast

On white

10.03

#1B379F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#1B379F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B379F

10.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B379F	#FFFFFF	#000000	##FFFFFF
##1B379F	1.00	10.03	2.09	10.03
#FFFFFF	10.03	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0048A2

Deuteranopia (green-blind)

#003C9D

Tritanopia (blue-blind)

#005366

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1b379f;
/* rgb */ color: rgb(27, 55, 159);
/* oklch */ color: oklch(39.1% 0.171 266.3);

Tailwind

colors: {
  custom: {
    50: '#706dbc',
    500: '#1b379f',
    950: '#000000',
  },
}

SCSS

$custom: #1b379f;
$custom-light: #706dbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b379f",
  "rgb": {
    "r": 27,
    "g": 55,
    "b": 159
  },
  "hsl": {
    "h": 227.273,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.39116,
    "c": 0.17122,
    "h": 266.3
  },
  "luminance": 0.05469
}

Semantic roles & 50–950 ramp

primary

#1B379F

secondary

#C5AC51

accent

#C83AEE

background

#F7F6FB

surface

#EDEBF7

border

#C8C6D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B379F

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

Preview Lab → · Contrast checker → · Palette generator →