#1F379C#1F379C

#1F379C is a dark, vivid blue. Relative luminance 0.054; OKLCH L 39.0% C 0.166 H 267.4°. Best body text is #FFFFFF at 10.07:1 contrast (WCAG AA passes).

Color values

HEX	#1F379C
RGB	rgb(31, 55, 156)
HSL	hsl(228, 67%, 37%)
HSV	hsv(228, 80%, 61%)
CMYK	cmyk(80.1%, 64.7%, 0%, 38.8%)
CIE-LAB	lab(27.91, 29.22, -57.37)
CIE-LCH	lch(27.91, 64.39, 296.99°)
OKLab	oklab(38.99% -0.0077 -0.166)
OKLCH	oklch(38.99% 0.166 267.4)
XYZ	xyz(7.9299, 5.4231, 32.0749)
Luminance	0.0542 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F379C #9C841F

analogous

#1F769C #1F379C #461F9C

triadic

#1F379C #9C1F37 #379C1F

tetradic

#1F379C #9C1F76 #9C841F #1F9C46

square

#1F379C #9C1F76 #9C841F #1F9C46

split-complementary

#1F379C #9C461F #769C1F

monochromatic

#0B1336 #152569 #1F379C #2949CF #5871DE

Accessibility & contrast

On white

10.07

#1F379C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#1F379C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F379C

10.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F379C	#FFFFFF	#000000	##FFFFFF
##1F379C	1.00	10.07	2.08	10.07
#FFFFFF	10.07	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00489F

Deuteranopia (green-blind)

#003C9A

Tritanopia (blue-blind)

#005264

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1f379c;
/* rgb */ color: rgb(31, 55, 156);
/* oklch */ color: oklch(39.0% 0.166 267.4);

Tailwind

colors: {
  custom: {
    50: '#716dba',
    500: '#1f379c',
    950: '#000000',
  },
}

SCSS

$custom: #1f379c;
$custom-light: #716dba;
$custom-dark: #000000;

JSON

{
  "hex": "#1f379c",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 156
  },
  "hsl": {
    "h": 228.48,
    "s": 66.845,
    "l": 36.667
  },
  "oklch": {
    "l": 0.38986,
    "c": 0.1662,
    "h": 267.4
  },
  "luminance": 0.05424
}

Semantic roles & 50–950 ramp

primary

#1F379C

secondary

#C1AD55

accent

#C93EEA

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F379C

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

Preview Lab → · Contrast checker → · Palette generator →