#1F439B#1F439B

#1F439B is a dark, vivid blue. Relative luminance 0.067; OKLCH L 41.3% C 0.150 H 264.1°. Best body text is #FFFFFF at 9.00:1 contrast (WCAG AA passes).

Color values

HEX	#1F439B
RGB	rgb(31, 67, 155)
HSL	hsl(223, 67%, 36%)
HSV	hsv(223, 80%, 61%)
CMYK	cmyk(80%, 56.8%, 0%, 39.2%)
CIE-LAB	lab(31.05, 20.69, -51.64)
CIE-LCH	lch(31.05, 55.63, 291.83°)
OKLab	oklab(41.3% -0.0155 -0.149)
OKLCH	oklch(41.3% 0.15 264.1)
XYZ	xyz(8.4865, 6.6712, 31.8444)
Luminance	0.0667 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F439B #9B771F

analogous

#1F819B #1F439B #391F9B

triadic

#1F439B #9B1F43 #439B1F

tetradic

#1F439B #9B1F81 #9B771F #1F9B39

square

#1F439B #9B1F81 #9B771F #1F9B39

split-complementary

#1F439B #9B391F #819B1F

monochromatic

#0B1735 #152D68 #1F439B #2959CE #577EDD

Accessibility & contrast

On white

9.00

#1F439B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.33

#1F439B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F439B

9.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F439B	#FFFFFF	#000000	##FFFFFF
##1F439B	1.00	9.00	2.33	9.00
#FFFFFF	9.00	1.00	21.00	1.00
#000000	2.33	21.00	1.00	21.00
##FFFFFF	9.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004F9E

Deuteranopia (green-blind)

#004499

Tritanopia (blue-blind)

#005968

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #1f439b;
/* rgb */ color: rgb(31, 67, 155);
/* oklch */ color: oklch(41.3% 0.150 264.1);

Tailwind

colors: {
  custom: {
    50: '#6f76b9',
    500: '#1f439b',
    950: '#000000',
  },
}

SCSS

$custom: #1f439b;
$custom-light: #6f76b9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f439b",
  "rgb": {
    "r": 31,
    "g": 67,
    "b": 155
  },
  "hsl": {
    "h": 222.581,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.41301,
    "c": 0.14984,
    "h": 264.1
  },
  "luminance": 0.06672
}

Semantic roles & 50–950 ramp

primary

#1F439B

secondary

#C1A255

accent

#B83EEA

background

#F7F7FB

surface

#EDEDF6

border

#C8C8D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #1F439B

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

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