#1F378E#1F378E

#1F378E is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.7% C 0.147 H 267.1°. Best body text is #FFFFFF at 10.52:1 contrast (WCAG AA passes).

Color values

HEX	#1F378E
RGB	rgb(31, 55, 142)
HSL	hsl(227, 64%, 34%)
HSV	hsv(227, 78%, 56%)
CMYK	cmyk(78.2%, 61.3%, 0%, 44.3%)
CIE-LAB	lab(26.67, 23.78, -50.82)
CIE-LCH	lch(26.67, 56.11, 295.08°)
OKLab	oklab(37.68% -0.0076 -0.1468)
OKLCH	oklch(37.68% 0.147 267.1)
XYZ	xyz(6.8120, 4.9759, 26.1874)
Luminance	0.0498 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F378E #8E761F

analogous

#1F6F8E #1F378E #3F1F8E

triadic

#1F378E #8E1F37 #378E1F

tetradic

#1F378E #8E1F6F #8E761F #1F8E3F

square

#1F378E #8E1F6F #8E761F #1F8E3F

split-complementary

#1F378E #8E3F1F #6F8E1F

monochromatic

#09102A #14245C #1F378E #2A4AC0 #4F6DD9

Accessibility & contrast

On white

10.52

#1F378E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1F378E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F378E

10.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F378E	#FFFFFF	#000000	##FFFFFF
##1F378E	1.00	10.52	2.00	10.52
#FFFFFF	10.52	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004491

Deuteranopia (green-blind)

#003A8C

Tritanopia (blue-blind)

#004D5D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1f378e;
/* rgb */ color: rgb(31, 55, 142);
/* oklch */ color: oklch(37.7% 0.147 267.1);

Tailwind

colors: {
  custom: {
    50: '#6d6db0',
    500: '#1f378e',
    950: '#000000',
  },
}

SCSS

$custom: #1f378e;
$custom-light: #6d6db0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f378e",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 142
  },
  "hsl": {
    "h": 227.027,
    "s": 64.162,
    "l": 33.922
  },
  "oklch": {
    "l": 0.37683,
    "c": 0.147,
    "h": 267.1
  },
  "luminance": 0.04977
}

Semantic roles & 50–950 ramp

primary

#1F378E

secondary

#BBA44D

accent

#C341E7

background

#F7F6FA

surface

#EDEBF5

border

#C8C6CF

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1F378E

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

Preview Lab → · Contrast checker → · Palette generator →