#1F4581#1F4581

#1F4581 is a dark, moderate blue. Relative luminance 0.061; OKLCH L 39.7% C 0.110 H 259.3°. Best body text is #FFFFFF at 9.43:1 contrast (WCAG AA passes).

Color values

HEX	#1F4581
RGB	rgb(31, 69, 129)
HSL	hsl(217, 61%, 31%)
HSV	hsv(217, 76%, 51%)
CMYK	cmyk(76%, 46.5%, 0%, 49.4%)
CIE-LAB	lab(29.74, 8.91, -37.77)
CIE-LCH	lch(29.74, 38.81, 283.27°)
OKLab	oklab(39.71% -0.0205 -0.1082)
OKLCH	oklch(39.71% 0.11 259.3)
XYZ	xyz(6.6542, 6.1318, 21.5975)
Luminance	0.0613 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4581 #815B1F

analogous

#1F7681 #1F4581 #2A1F81

triadic

#1F4581 #811F45 #45811F

tetradic

#1F4581 #811F76 #815B1F #1F812A

square

#1F4581 #811F76 #815B1F #1F812A

split-complementary

#1F4581 #812A1F #76811F

monochromatic

#07101E #132B50 #1F4581 #2B5FB2 #477ED3

Accessibility & contrast

On white

9.43

#1F4581 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1F4581 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4581

9.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4581	#FFFFFF	#000000	##FFFFFF
##1F4581	1.00	9.43	2.23	9.43
#FFFFFF	9.43	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#264B83

Deuteranopia (green-blind)

#124280

Tritanopia (blue-blind)

#00535C

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1f4581;
/* rgb */ color: rgb(31, 69, 129);
/* oklch */ color: oklch(39.7% 0.110 259.3);

Tailwind

colors: {
  custom: {
    50: '#6978a6',
    500: '#1f4581',
    950: '#000000',
  },
}

SCSS

$custom: #1f4581;
$custom-light: #6978a6;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4581",
  "rgb": {
    "r": 31,
    "g": 69,
    "b": 129
  },
  "hsl": {
    "h": 216.735,
    "s": 61.25,
    "l": 31.373
  },
  "oklch": {
    "l": 0.39706,
    "c": 0.11013,
    "h": 259.3
  },
  "luminance": 0.06133
}

Semantic roles & 50–950 ramp

primary

#1F4581

secondary

#B48A48

accent

#A643E4

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#07080F

muted

#7A7B7F

Preview Lab

Preview with #1F4581

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

Preview Lab → · Contrast checker → · Palette generator →