#1F4D9F#1F4D9F

#1F4D9F is a dark, vivid blue. Relative luminance 0.081; OKLCH L 43.8% C 0.143 H 260.9°. Best body text is #FFFFFF at 8.01:1 contrast (WCAG AA passes).

Color values

HEX	#1F4D9F
RGB	rgb(31, 77, 159)
HSL	hsl(218, 67%, 37%)
HSV	hsv(218, 81%, 62%)
CMYK	cmyk(80.5%, 51.6%, 0%, 37.6%)
CIE-LAB	lab(34.19, 15.49, -48.96)
CIE-LCH	lch(34.19, 51.35, 287.55°)
OKLab	oklab(43.79% -0.0225 -0.141)
OKLCH	oklch(43.79% 0.143 260.9)
XYZ	xyz(9.4747, 8.1011, 33.8585)
Luminance	0.0810 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4D9F #9F711F

analogous

#1F8D9F #1F4D9F #311F9F

triadic

#1F4D9F #9F1F4D #4D9F1F

tetradic

#1F4D9F #9F1F8D #9F711F #1F9F31

square

#1F4D9F #9F1F8D #9F711F #1F9F31

split-complementary

#1F4D9F #9F311F #8D9F1F

monochromatic

#0B1B39 #15346C #1F4D9F #2966D2 #5A89DF

Accessibility & contrast

On white

8.01

#1F4D9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.62

#1F4D9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4D9F

8.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4D9F	#FFFFFF	#000000	##FFFFFF
##1F4D9F	1.00	8.01	2.62	8.01
#FFFFFF	8.01	1.00	21.00	1.00
#000000	2.62	21.00	1.00	21.00
##FFFFFF	8.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1857A2

Deuteranopia (green-blind)

#004B9D

Tritanopia (blue-blind)

#00616E

Achromatopsia (no color)

#505050

Design tokens & code

CSS

--color: #1f4d9f;
/* rgb */ color: rgb(31, 77, 159);
/* oklch */ color: oklch(43.8% 0.143 260.9);

Tailwind

colors: {
  custom: {
    50: '#707ebc',
    500: '#1f4d9f',
    950: '#000000',
  },
}

SCSS

$custom: #1f4d9f;
$custom-light: #707ebc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4d9f",
  "rgb": {
    "r": 31,
    "g": 77,
    "b": 159
  },
  "hsl": {
    "h": 218.438,
    "s": 67.368,
    "l": 37.255
  },
  "oklch": {
    "l": 0.43785,
    "c": 0.14275,
    "h": 260.9
  },
  "luminance": 0.08102
}

Semantic roles & 50–950 ramp

primary

#1F4D9F

secondary

#C39C57

accent

#AC3EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#090912

muted

#7B7B81

Preview Lab

Preview with #1F4D9F

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

Preview Lab → · Contrast checker → · Palette generator →