#1F3F78#1F3F78

#1F3F78 is a dark, moderate blue. Relative luminance 0.052; OKLCH L 37.6% C 0.105 H 261.0°. Best body text is #FFFFFF at 10.29:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F78
RGB	rgb(31, 63, 120)
HSL	hsl(218, 59%, 30%)
HSV	hsv(218, 74%, 47%)
CMYK	cmyk(74.2%, 47.5%, 0%, 52.9%)
CIE-LAB	lab(27.30, 9.42, -36.05)
CIE-LCH	lch(27.30, 37.26, 284.65°)
OKLab	oklab(37.63% -0.0164 -0.1032)
OKLCH	oklch(37.63% 0.105 261)
XYZ	xyz(5.7315, 5.2018, 18.4676)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F78 #78581F

analogous

#1F6C78 #1F3F78 #2C1F78

triadic

#1F3F78 #781F3F #3F781F

tetradic

#1F3F78 #781F6C #78581F #1F782C

square

#1F3F78 #781F6C #78581F #1F782C

split-complementary

#1F3F78 #782C1F #6C781F

monochromatic

#060D18 #122547 #1F3F78 #2C59A9 #4375CE

Accessibility & contrast

On white

10.29

#1F3F78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#1F3F78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F78

10.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F78	#FFFFFF	#000000	##FFFFFF
##1F3F78	1.00	10.29	2.04	10.29
#FFFFFF	10.29	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#22457A

Deuteranopia (green-blind)

#103D77

Tritanopia (blue-blind)

#004C55

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f3f78;
/* rgb */ color: rgb(31, 63, 120);
/* oklch */ color: oklch(37.6% 0.105 261.0);

Tailwind

colors: {
  custom: {
    50: '#67739f',
    500: '#1f3f78',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f78;
$custom-light: #67739f;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f78",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 120
  },
  "hsl": {
    "h": 218.427,
    "s": 58.94,
    "l": 29.608
  },
  "oklch": {
    "l": 0.37632,
    "c": 0.10455,
    "h": 261
  },
  "luminance": 0.05202
}

Semantic roles & 50–950 ramp

primary

#1F3F78

secondary

#AB8747

accent

#AA46E2

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#07080E

muted

#7A7B7E

Preview Lab

Preview with #1F3F78

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

Preview Lab → · Contrast checker → · Palette generator →