#1F378C#1F378C

#1F378C is a dark, vivid blue. Relative luminance 0.049; OKLCH L 37.5% C 0.144 H 267.0°. Best body text is #FFFFFF at 10.59:1 contrast (WCAG AA passes).

Color values

HEX	#1F378C
RGB	rgb(31, 55, 140)
HSL	hsl(227, 64%, 34%)
HSV	hsv(227, 78%, 55%)
CMYK	cmyk(77.9%, 60.7%, 0%, 45.1%)
CIE-LAB	lab(26.50, 23.00, -49.86)
CIE-LCH	lch(26.50, 54.90, 294.76°)
OKLab	oklab(37.5% -0.0076 -0.144)
OKLCH	oklch(37.5% 0.144 267)
XYZ	xyz(6.6632, 4.9164, 25.4036)
Luminance	0.0492 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F378C #8C741F

analogous

#1F6D8C #1F378C #3D1F8C

triadic

#1F378C #8C1F37 #378C1F

tetradic

#1F378C #8C1F6D #8C741F #1F8C3D

square

#1F378C #8C1F6D #8C741F #1F8C3D

split-complementary

#1F378C #8C3D1F #6D8C1F

monochromatic

#091028 #14235A #1F378C #2A4BBE #4E6CD8

Accessibility & contrast

On white

10.59

#1F378C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.98

#1F378C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F378C

10.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F378C	#FFFFFF	#000000	##FFFFFF
##1F378C	1.00	10.59	1.98	10.59
#FFFFFF	10.59	1.00	21.00	1.00
#000000	1.98	21.00	1.00	21.00
##FFFFFF	10.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448F

Deuteranopia (green-blind)

#003A8A

Tritanopia (blue-blind)

#004C5C

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1f378c;
/* rgb */ color: rgb(31, 55, 140);
/* oklch */ color: oklch(37.5% 0.144 267.0);

Tailwind

colors: {
  custom: {
    50: '#6c6dae',
    500: '#1f378c',
    950: '#000000',
  },
}

SCSS

$custom: #1f378c;
$custom-light: #6c6dae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f378c",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 140
  },
  "hsl": {
    "h": 226.789,
    "s": 63.743,
    "l": 33.529
  },
  "oklch": {
    "l": 0.37502,
    "c": 0.14419,
    "h": 267
  },
  "luminance": 0.04917
}

Semantic roles & 50–950 ramp

primary

#1F378C

secondary

#BBA24C

accent

#C241E7

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1F378C

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

Preview Lab → · Contrast checker → · Palette generator →