#1F3D8B#1F3D8B

#1F3D8B is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.7% C 0.135 H 264.8°. Best body text is #FFFFFF at 10.01:1 contrast (WCAG AA passes).

Color values

HEX	#1F3D8B
RGB	rgb(31, 61, 139)
HSL	hsl(223, 64%, 33%)
HSV	hsv(223, 78%, 55%)
CMYK	cmyk(77.7%, 56.1%, 0%, 45.5%)
CIE-LAB	lab(28.09, 18.45, -46.64)
CIE-LCH	lch(28.09, 50.15, 291.58°)
OKLab	oklab(38.68% -0.0122 -0.1344)
OKLCH	oklch(38.68% 0.135 264.8)
XYZ	xyz(6.8924, 5.4921, 25.1179)
Luminance	0.0549 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3D8B #8B6D1F

analogous

#1F738B #1F3D8B #371F8B

triadic

#1F3D8B #8B1F3D #3D8B1F

tetradic

#1F3D8B #8B1F73 #8B6D1F #1F8B37

square

#1F3D8B #8B1F73 #8B6D1F #1F8B37

split-complementary

#1F3D8B #8B371F #738B1F

monochromatic

#091127 #142759 #1F3D8B #2A53BD #4D73D7

Accessibility & contrast

On white

10.01

#1F3D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#1F3D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3D8B

10.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3D8B	#FFFFFF	#000000	##FFFFFF
##1F3D8B	1.00	10.01	2.10	10.01
#FFFFFF	10.01	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1f3d8b;
/* rgb */ color: rgb(31, 61, 139);
/* oklch */ color: oklch(38.7% 0.135 264.8);

Tailwind

colors: {
  custom: {
    50: '#6c72ad',
    500: '#1f3d8b',
    950: '#000000',
  },
}

SCSS

$custom: #1f3d8b;
$custom-light: #6c72ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3d8b",
  "rgb": {
    "r": 31,
    "g": 61,
    "b": 139
  },
  "hsl": {
    "h": 223.333,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.38676,
    "c": 0.13499,
    "h": 264.8
  },
  "luminance": 0.05493
}

Semantic roles & 50–950 ramp

primary

#1F3D8B

secondary

#BA9B4C

accent

#B941E7

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1F3D8B

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

Preview Lab → · Contrast checker → · Palette generator →