#1F4B9B#1F4B9B

#1F4B9B is a dark, vivid blue. Relative luminance 0.077; OKLCH L 43.0% C 0.140 H 261.2°. Best body text is #FFFFFF at 8.27:1 contrast (WCAG AA passes).

Color values

HEX	#1F4B9B
RGB	rgb(31, 75, 155)
HSL	hsl(219, 67%, 36%)
HSV	hsv(219, 80%, 61%)
CMYK	cmyk(80%, 51.6%, 0%, 39.2%)
CIE-LAB	lab(33.33, 15.24, -47.95)
CIE-LCH	lch(33.33, 50.31, 287.64°)
OKLab	oklab(43.03% -0.0215 -0.138)
OKLCH	oklch(43.03% 0.14 261.2)
XYZ	xyz(8.9954, 7.6890, 32.0140)
Luminance	0.0769 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F4B9B #9B6F1F

analogous

#1F899B #1F4B9B #311F9B

triadic

#1F4B9B #9B1F4B #4B9B1F

tetradic

#1F4B9B #9B1F89 #9B6F1F #1F9B31

square

#1F4B9B #9B1F89 #9B6F1F #1F9B31

split-complementary

#1F4B9B #9B311F #899B1F

monochromatic

#0B1A35 #153268 #1F4B9B #2964CE #5787DD

Accessibility & contrast

On white

8.27

#1F4B9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.54

#1F4B9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F4B9B

8.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F4B9B	#FFFFFF	#000000	##FFFFFF
##1F4B9B	1.00	8.27	2.54	8.27
#FFFFFF	8.27	1.00	21.00	1.00
#000000	2.54	21.00	1.00	21.00
##FFFFFF	8.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#18549E

Deuteranopia (green-blind)

#004999

Tritanopia (blue-blind)

#005E6B

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #1f4b9b;
/* rgb */ color: rgb(31, 75, 155);
/* oklch */ color: oklch(43.0% 0.140 261.2);

Tailwind

colors: {
  custom: {
    50: '#6f7cb9',
    500: '#1f4b9b',
    950: '#000000',
  },
}

SCSS

$custom: #1f4b9b;
$custom-light: #6f7cb9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f4b9b",
  "rgb": {
    "r": 31,
    "g": 75,
    "b": 155
  },
  "hsl": {
    "h": 218.71,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.43032,
    "c": 0.13968,
    "h": 261.2
  },
  "luminance": 0.0769
}

Semantic roles & 50–950 ramp

primary

#1F4B9B

secondary

#C19B55

accent

#AD3EEA

background

#F7F7FB

surface

#EDEEF6

border

#C8C9D0

text

#080911

muted

#7B7B80

Preview Lab

Preview with #1F4B9B

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

Preview Lab → · Contrast checker → · Palette generator →