#1F3779#1F3779

#1F3779 is a dark, moderate blue. Relative luminance 0.044; OKLCH L 35.9% C 0.117 H 265.7°. Best body text is #FFFFFF at 11.17:1 contrast (WCAG AA passes).

Color values

HEX	#1F3779
RGB	rgb(31, 55, 121)
HSL	hsl(224, 59%, 30%)
HSV	hsv(224, 74%, 47%)
CMYK	cmyk(74.4%, 54.5%, 0%, 52.5%)
CIE-LAB	lab(24.96, 15.43, -40.45)
CIE-LCH	lch(24.96, 43.29, 290.88°)
OKLab	oklab(35.87% -0.0087 -0.1163)
OKLCH	oklch(35.87% 0.117 265.7)
XYZ	xyz(5.3812, 4.4036, 18.6518)
Luminance	0.0440 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3779 #79611F

analogous

#1F6479 #1F3779 #341F79

triadic

#1F3779 #791F37 #37791F

tetradic

#1F3779 #791F64 #79611F #1F7934

square

#1F3779 #791F64 #79611F #1F7934

split-complementary

#1F3779 #79341F #64791F

monochromatic

#060B18 #132148 #1F3779 #2B4DAA #4369CF

Accessibility & contrast

On white

11.17

#1F3779 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#1F3779 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3779

11.17:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3779	#FFFFFF	#000000	##FFFFFF
##1F3779	1.00	11.17	1.88	11.17
#FFFFFF	11.17	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.17	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A407B

Deuteranopia (green-blind)

#003778

Tritanopia (blue-blind)

#004752

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1f3779;
/* rgb */ color: rgb(31, 55, 121);
/* oklch */ color: oklch(35.9% 0.117 265.7);

Tailwind

colors: {
  custom: {
    50: '#686da0',
    500: '#1f3779',
    950: '#000000',
  },
}

SCSS

$custom: #1f3779;
$custom-light: #686da0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3779",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 121
  },
  "hsl": {
    "h": 224,
    "s": 59.211,
    "l": 29.804
  },
  "oklch": {
    "l": 0.35868,
    "c": 0.11667,
    "h": 265.7
  },
  "luminance": 0.04404
}

Semantic roles & 50–950 ramp

primary

#1F3779

secondary

#AC9147

accent

#B945E2

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#07070F

muted

#7A7A7E

Preview Lab

Preview with #1F3779

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

Preview Lab → · Contrast checker → · Palette generator →