#1F3F79#1F3F79

#1F3F79 is a dark, moderate blue. Relative luminance 0.052; OKLCH L 37.7% C 0.106 H 261.2°. Best body text is #FFFFFF at 10.27:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F79
RGB	rgb(31, 63, 121)
HSL	hsl(219, 59%, 30%)
HSV	hsv(219, 74%, 47%)
CMYK	cmyk(74.4%, 47.9%, 0%, 52.5%)
CIE-LAB	lab(27.37, 9.83, -36.57)
CIE-LCH	lch(27.37, 37.87, 285.04°)
OKLab	oklab(37.71% -0.0163 -0.1048)
OKLCH	oklch(37.71% 0.106 261.2)
XYZ	xyz(5.7925, 5.2262, 18.7889)
Luminance	0.0523 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F79 #79591F

analogous

#1F6C79 #1F3F79 #2C1F79

triadic

#1F3F79 #791F3F #3F791F

tetradic

#1F3F79 #791F6C #79591F #1F792C

square

#1F3F79 #791F6C #79591F #1F792C

split-complementary

#1F3F79 #792C1F #6C791F

monochromatic

#060D18 #132648 #1F3F79 #2B58AA #4375CF

Accessibility & contrast

On white

10.27

#1F3F79 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.05

#1F3F79 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F79

10.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F79	#FFFFFF	#000000	##FFFFFF
##1F3F79	1.00	10.27	2.05	10.27
#FFFFFF	10.27	1.00	21.00	1.00
#000000	2.05	21.00	1.00	21.00
##FFFFFF	10.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#21457B

Deuteranopia (green-blind)

#0E3D78

Tritanopia (blue-blind)

#004D56

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1f3f79;
/* rgb */ color: rgb(31, 63, 121);
/* oklch */ color: oklch(37.7% 0.106 261.2);

Tailwind

colors: {
  custom: {
    50: '#6773a0',
    500: '#1f3f79',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f79;
$custom-light: #6773a0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f79",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 121
  },
  "hsl": {
    "h": 218.667,
    "s": 59.211,
    "l": 29.804
  },
  "oklch": {
    "l": 0.37706,
    "c": 0.10603,
    "h": 261.2
  },
  "luminance": 0.05227
}

Semantic roles & 50–950 ramp

primary

#1F3F79

secondary

#AC8847

accent

#AB45E2

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#07080F

muted

#7A7B7E

Preview Lab

Preview with #1F3F79

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

Preview Lab → · Contrast checker → · Palette generator →