#1F3789#1F3789

#1F3789 is a dark, vivid blue. Relative luminance 0.048; OKLCH L 37.2% C 0.140 H 266.9°. Best body text is #FFFFFF at 10.68:1 contrast (WCAG AA passes).

Color values

HEX	#1F3789
RGB	rgb(31, 55, 137)
HSL	hsl(226, 63%, 33%)
HSV	hsv(226, 77%, 54%)
CMYK	cmyk(77.4%, 59.9%, 0%, 46.3%)
CIE-LAB	lab(26.24, 21.81, -48.41)
CIE-LCH	lch(26.24, 53.09, 294.26°)
OKLab	oklab(37.23% -0.0077 -0.1397)
OKLCH	oklch(37.23% 0.14 266.9)
XYZ	xyz(6.4450, 4.8291, 24.2545)
Luminance	0.0483 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3789 #89711F

analogous

#1F6C89 #1F3789 #3C1F89

triadic

#1F3789 #891F37 #37891F

tetradic

#1F3789 #891F6C #89711F #1F893C

square

#1F3789 #891F6C #89711F #1F893C

split-complementary

#1F3789 #893C1F #6C891F

monochromatic

#080F25 #142357 #1F3789 #2A4BBB #4C6BD6

Accessibility & contrast

On white

10.68

#1F3789 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.97

#1F3789 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3789

10.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3789	#FFFFFF	#000000	##FFFFFF
##1F3789	1.00	10.68	1.97	10.68
#FFFFFF	10.68	1.00	21.00	1.00
#000000	1.97	21.00	1.00	21.00
##FFFFFF	10.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00438C

Deuteranopia (green-blind)

#003987

Tritanopia (blue-blind)

#004C5A

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1f3789;
/* rgb */ color: rgb(31, 55, 137);
/* oklch */ color: oklch(37.2% 0.140 266.9);

Tailwind

colors: {
  custom: {
    50: '#6c6dac',
    500: '#1f3789',
    950: '#000000',
  },
}

SCSS

$custom: #1f3789;
$custom-light: #6c6dac;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3789",
  "rgb": {
    "r": 31,
    "g": 55,
    "b": 137
  },
  "hsl": {
    "h": 226.415,
    "s": 63.095,
    "l": 32.941
  },
  "oklch": {
    "l": 0.37234,
    "c": 0.13995,
    "h": 266.9
  },
  "luminance": 0.0483
}

Semantic roles & 50–950 ramp

primary

#1F3789

secondary

#B9A04B

accent

#C142E6

background

#F6F6FA

surface

#ECEBF4

border

#C7C6CE

text

#080710

muted

#7A7A7F

Preview Lab

Preview with #1F3789

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

Preview Lab → · Contrast checker → · Palette generator →