#1F4F9A#1F4F9A

#1F4F9A is a dark, vivid blue. Relative luminance 0.082; OKLCH L 43.9% C 0.133 H 259.3°. Best body text is #FFFFFF at 7.94:1 contrast (WCAG AA passes).

Color values

HEX	#1F4F9A
RGB	rgb(31, 79, 154)
HSL	hsl(217, 66%, 36%)
HSV	hsv(217, 80%, 60%)
CMYK	cmyk(79.9%, 48.7%, 0%, 39.6%)
CIE-LAB	lab(34.43, 12.14, -45.57)
CIE-LCH	lch(34.43, 47.16, 284.92°)
OKLab	oklab(43.85% -0.0248 -0.1309)
OKLCH	oklch(43.85% 0.133 259.3)
XYZ	xyz(9.1917, 8.2153, 31.6669)
Luminance	0.0822 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4F9A #9A6A1F

analogous

#1F8D9A #1F4F9A #2D1F9A

triadic

#1F4F9A #9A1F4F #4F9A1F

tetradic

#1F4F9A #9A1F8D #9A6A1F #1F9A2D

square

#1F4F9A #9A1F8D #9A6A1F #1F9A2D

split-complementary

#1F4F9A #9A2D1F #8D9A1F

monochromatic

#0A1B34 #153567 #1F4F9A #2969CD #568BDD

Accessibility & contrast

On white

7.94

#1F4F9A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.64

#1F4F9A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4F9A

7.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4F9A	#FFFFFF	#000000	##FFFFFF
##1F4F9A	1.00	7.94	2.64	7.94
#FFFFFF	7.94	1.00	21.00	1.00
#000000	2.64	21.00	1.00	21.00
##FFFFFF	7.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#25579D

Deuteranopia (green-blind)

#004C99

Tritanopia (blue-blind)

#00616D

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #1f4f9a;
/* rgb */ color: rgb(31, 79, 154);
/* oklch */ color: oklch(43.9% 0.133 259.3);

Tailwind

colors: {
  custom: {
    50: '#6f7fb8',
    500: '#1f4f9a',
    950: '#000000',
  },
}

SCSS

$custom: #1f4f9a;
$custom-light: #6f7fb8;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4f9a",
  "rgb": {
    "r": 31,
    "g": 79,
    "b": 154
  },
  "hsl": {
    "h": 216.585,
    "s": 66.486,
    "l": 36.275
  },
  "oklch": {
    "l": 0.43853,
    "c": 0.13327,
    "h": 259.3
  },
  "luminance": 0.08216
}

Semantic roles & 50–950 ramp

primary

#1F4F9A

secondary

#C19654

accent

#A73EE9

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#080A11

muted

#7B7C80

Preview Lab

Preview with #1F4F9A

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

Preview Lab → · Contrast checker → · Palette generator →