#1F4F9C#1F4F9C

#1F4F9C is a dark, vivid blue. Relative luminance 0.083; OKLCH L 44.0% C 0.136 H 259.6°. Best body text is #FFFFFF at 7.90:1 contrast (WCAG AA passes).

Color values

HEX	#1F4F9C
RGB	rgb(31, 79, 156)
HSL	hsl(217, 67%, 37%)
HSV	hsv(217, 80%, 61%)
CMYK	cmyk(80.1%, 49.4%, 0%, 38.8%)
CIE-LAB	lab(34.56, 12.94, -46.55)
CIE-LCH	lch(34.56, 48.32, 285.54°)
OKLab	oklab(44% -0.0245 -0.1338)
OKLCH	oklch(44% 0.136 259.6)
XYZ	xyz(9.3596, 8.2825, 32.5514)
Luminance	0.0828 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4F9C #9C6C1F

analogous

#1F8E9C #1F4F9C #2E1F9C

triadic

#1F4F9C #9C1F4F #4F9C1F

tetradic

#1F4F9C #9C1F8E #9C6C1F #1F9C2E

square

#1F4F9C #9C1F8E #9C6C1F #1F9C2E

split-complementary

#1F4F9C #9C2E1F #8E9C1F

monochromatic

#0B1B36 #153569 #1F4F9C #2969CF #588BDE

Accessibility & contrast

On white

7.90

#1F4F9C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.66

#1F4F9C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4F9C

7.90:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4F9C	#FFFFFF	#000000	##FFFFFF
##1F4F9C	1.00	7.90	2.66	7.90
#FFFFFF	7.90	1.00	21.00	1.00
#000000	2.66	21.00	1.00	21.00
##FFFFFF	7.90	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#22579F

Deuteranopia (green-blind)

#004C9A

Tritanopia (blue-blind)

#00616E

Achromatopsia (no color)

#515151

Design tokens & code

CSS

--color: #1f4f9c;
/* rgb */ color: rgb(31, 79, 156);
/* oklch */ color: oklch(44.0% 0.136 259.6);

Tailwind

colors: {
  custom: {
    50: '#6f7fba',
    500: '#1f4f9c',
    950: '#000000',
  },
}

SCSS

$custom: #1f4f9c;
$custom-light: #6f7fba;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4f9c",
  "rgb": {
    "r": 31,
    "g": 79,
    "b": 156
  },
  "hsl": {
    "h": 216.96,
    "s": 66.845,
    "l": 36.667
  },
  "oklch": {
    "l": 0.44002,
    "c": 0.13606,
    "h": 259.6
  },
  "luminance": 0.08284
}

Semantic roles & 50–950 ramp

primary

#1F4F9C

secondary

#C19855

accent

#A83EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1F4F9C

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

Preview Lab → · Contrast checker → · Palette generator →