#1F378F#1F378F

#1F378F is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.8% C 0.148 H 267.1°. Best body text is #FFFFFF at 10.49:1 contrast (WCAG AA passes).

Color values

HEX	#1F378F
RGB	rgb(31, 55, 143)
HSL	hsl(227, 64%, 34%)
HSV	hsv(227, 78%, 56%)
CMYK	cmyk(78.3%, 61.5%, 0%, 43.9%)
CIE-LAB	lab(26.75, 24.18, -51.29)
CIE-LCH	lch(26.75, 56.71, 295.24°)
OKLab	oklab(37.77% -0.0075 -0.1482)
OKLCH	oklch(37.77% 0.148 267.1)
XYZ	xyz(6.8875, 5.0061, 26.5846)
Luminance	0.0501 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F378F #8F771F

analogous

#1F6F8F #1F378F #3F1F8F

triadic

#1F378F #8F1F37 #378F1F

tetradic

#1F378F #8F1F6F #8F771F #1F8F3F

square

#1F378F #8F1F6F #8F771F #1F8F3F

split-complementary

#1F378F #8F3F1F #6F8F1F

monochromatic

#09102A #14245D #1F378F #2A4AC1 #4F6DD9

Accessibility & contrast

On white

10.49

#1F378F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1F378F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F378F

10.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F378F	#FFFFFF	#000000	##FFFFFF
##1F378F	1.00	10.49	2.00	10.49
#FFFFFF	10.49	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004592

Deuteranopia (green-blind)

#003A8D

Tritanopia (blue-blind)

#004D5D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1f378f;
/* rgb */ color: rgb(31, 55, 143);
/* oklch */ color: oklch(37.8% 0.148 267.1);

Tailwind

colors: {
  custom: {
    50: '#6d6db1',
    500: '#1f378f',
    950: '#000000',
  },
}

SCSS

$custom: #1f378f;
$custom-light: #6d6db1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f378f",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 143
  },
  "hsl": {
    "h": 227.143,
    "s": 64.368,
    "l": 34.118
  },
  "oklch": {
    "l": 0.37773,
    "c": 0.1484,
    "h": 267.1
  },
  "luminance": 0.05007
}

Semantic roles & 50–950 ramp

primary

#1F378F

secondary

#BCA44E

accent

#C440E7

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #1F378F

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

Preview Lab → · Contrast checker → · Palette generator →