#1F4F9B#1F4F9B

#1F4F9B is a dark, vivid blue. Relative luminance 0.083; OKLCH L 43.9% C 0.135 H 259.4°. Best body text is #FFFFFF at 7.92:1 contrast (WCAG AA passes).

Color values

HEX	#1F4F9B
RGB	rgb(31, 79, 155)
HSL	hsl(217, 67%, 36%)
HSV	hsv(217, 80%, 61%)
CMYK	cmyk(80%, 49%, 0%, 39.2%)
CIE-LAB	lab(34.50, 12.54, -46.06)
CIE-LCH	lch(34.50, 47.74, 285.23°)
OKLab	oklab(43.93% -0.0247 -0.1324)
OKLCH	oklch(43.93% 0.135 259.4)
XYZ	xyz(9.2753, 8.2487, 32.1073)
Luminance	0.0825 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4F9B #9B6B1F

analogous

#1F8D9B #1F4F9B #2D1F9B

triadic

#1F4F9B #9B1F4F #4F9B1F

tetradic

#1F4F9B #9B1F8D #9B6B1F #1F9B2D

square

#1F4F9B #9B1F8D #9B6B1F #1F9B2D

split-complementary

#1F4F9B #9B2D1F #8D9B1F

monochromatic

#0B1B35 #153568 #1F4F9B #2969CE #578BDD

Accessibility & contrast

On white

7.92

#1F4F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.65

#1F4F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4F9B

7.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4F9B	#FFFFFF	#000000	##FFFFFF
##1F4F9B	1.00	7.92	2.65	7.92
#FFFFFF	7.92	1.00	21.00	1.00
#000000	2.65	21.00	1.00	21.00
##FFFFFF	7.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#24579E

Deuteranopia (green-blind)

#004C99

Tritanopia (blue-blind)

#00616D

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #1f4f9b;
/* rgb */ color: rgb(31, 79, 155);
/* oklch */ color: oklch(43.9% 0.135 259.4);

Tailwind

colors: {
  custom: {
    50: '#6f7fb9',
    500: '#1f4f9b',
    950: '#000000',
  },
}

SCSS

$custom: #1f4f9b;
$custom-light: #6f7fb9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4f9b",
  "rgb": {
    "r": 31,
    "g": 79,
    "b": 155
  },
  "hsl": {
    "h": 216.774,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.43928,
    "c": 0.13466,
    "h": 259.4
  },
  "luminance": 0.0825
}

Semantic roles & 50–950 ramp

primary

#1F4F9B

secondary

#C19755

accent

#A73EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#080A11

muted

#7B7C80

Preview Lab

Preview with #1F4F9B

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

Preview Lab → · Contrast checker → · Palette generator →