#1F379B#1F379B

#1F379B is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.9% C 0.165 H 267.3°. Best body text is #FFFFFF at 10.11:1 contrast (WCAG AA passes).

Color values

HEX	#1F379B
RGB	rgb(31, 55, 155)
HSL	hsl(228, 67%, 36%)
HSV	hsv(228, 80%, 61%)
CMYK	cmyk(80%, 64.5%, 0%, 39.2%)
CIE-LAB	lab(27.82, 28.84, -56.91)
CIE-LCH	lch(27.82, 63.80, 296.87°)
OKLab	oklab(38.89% -0.0076 -0.1647)
OKLCH	oklch(38.89% 0.165 267.3)
XYZ	xyz(7.8456, 5.3893, 31.6307)
Luminance	0.0539 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F379B #9B831F

analogous

#1F759B #1F379B #451F9B

triadic

#1F379B #9B1F37 #379B1F

tetradic

#1F379B #9B1F75 #9B831F #1F9B45

square

#1F379B #9B1F75 #9B831F #1F9B45

split-complementary

#1F379B #9B451F #759B1F

monochromatic

#0B1335 #152568 #1F379B #2949CE #5771DD

Accessibility & contrast

On white

10.11

#1F379B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#1F379B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F379B

10.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F379B	#FFFFFF	#000000	##FFFFFF
##1F379B	1.00	10.11	2.08	10.11
#FFFFFF	10.11	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00489E

Deuteranopia (green-blind)

#003C99

Tritanopia (blue-blind)

#005163

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1f379b;
/* rgb */ color: rgb(31, 55, 155);
/* oklch */ color: oklch(38.9% 0.165 267.3);

Tailwind

colors: {
  custom: {
    50: '#706db9',
    500: '#1f379b',
    950: '#000000',
  },
}

SCSS

$custom: #1f379b;
$custom-light: #706db9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f379b",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 155
  },
  "hsl": {
    "h": 228.387,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.38891,
    "c": 0.16486,
    "h": 267.3
  },
  "luminance": 0.0539
}

Semantic roles & 50–950 ramp

primary

#1F379B

secondary

#C1AC55

accent

#C83EEA

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F379B

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

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