#1F3F8A#1F3F8A

#1F3F8A is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.0% C 0.131 H 263.9°. Best body text is #FFFFFF at 9.83:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F8A
RGB	rgb(31, 63, 138)
HSL	hsl(222, 63%, 33%)
HSV	hsv(222, 78%, 54%)
CMYK	cmyk(77.5%, 54.3%, 0%, 45.9%)
CIE-LAB	lab(28.59, 16.66, -45.21)
CIE-LCH	lch(28.59, 48.18, 290.23°)
OKLab	oklab(39.03% -0.0139 -0.1302)
OKLCH	oklch(39.03% 0.131 263.9)
XYZ	xyz(6.9284, 5.6805, 24.7711)
Luminance	0.0568 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F8A #8A6A1F

analogous

#1F748A #1F3F8A #341F8A

triadic

#1F3F8A #8A1F3F #3F8A1F

tetradic

#1F3F8A #8A1F74 #8A6A1F #1F8A34

square

#1F3F8A #8A1F74 #8A6A1F #1F8A34

split-complementary

#1F3F8A #8A341F #748A1F

monochromatic

#091126 #142858 #1F3F8A #2A56BC #4C76D7

Accessibility & contrast

On white

9.83

#1F3F8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#1F3F8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F8A

9.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F8A	#FFFFFF	#000000	##FFFFFF
##1F3F8A	1.00	9.83	2.14	9.83
#FFFFFF	9.83	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#08498D

Deuteranopia (green-blind)

#003F89

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1f3f8a;
/* rgb */ color: rgb(31, 63, 138);
/* oklch */ color: oklch(39.0% 0.131 263.9);

Tailwind

colors: {
  custom: {
    50: '#6b73ad',
    500: '#1f3f8a',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f8a;
$custom-light: #6b73ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f8a",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 138
  },
  "hsl": {
    "h": 222.056,
    "s": 63.314,
    "l": 33.137
  },
  "oklch": {
    "l": 0.39029,
    "c": 0.13094,
    "h": 263.9
  },
  "luminance": 0.05681
}

Semantic roles & 50–950 ramp

primary

#1F3F8A

secondary

#BA994B

accent

#B541E6

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1F3F8A

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

Preview Lab → · Contrast checker → · Palette generator →