#1F448B#1F448B

#1F448B is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.2% C 0.126 H 261.8°. Best body text is #FFFFFF at 9.30:1 contrast (WCAG AA passes).

Color values

HEX	#1F448B
RGB	rgb(31, 68, 139)
HSL	hsl(219, 64%, 33%)
HSV	hsv(219, 78%, 55%)
CMYK	cmyk(77.7%, 51.1%, 0%, 45.5%)
CIE-LAB	lab(30.13, 13.61, -43.34)
CIE-LCH	lch(30.13, 45.43, 287.43°)
OKLab	oklab(40.22% -0.0179 -0.1246)
OKLCH	oklch(40.22% 0.126 261.8)
XYZ	xyz(7.2907, 6.2888, 25.2507)
Luminance	0.0629 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F448B #8B661F

analogous

#1F7A8B #1F448B #301F8B

triadic

#1F448B #8B1F44 #448B1F

tetradic

#1F448B #8B1F7A #8B661F #1F8B30

square

#1F448B #8B1F7A #8B661F #1F8B30

split-complementary

#1F448B #8B301F #7A8B1F

monochromatic

#091327 #142C59 #1F448B #2A5CBD #4D7CD7

Accessibility & contrast

On white

9.30

#1F448B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#1F448B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F448B

9.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F448B	#FFFFFF	#000000	##FFFFFF
##1F448B	1.00	9.30	2.26	9.30
#FFFFFF	9.30	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A4C8E

Deuteranopia (green-blind)

#00428A

Tritanopia (blue-blind)

#005561

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #1f448b;
/* rgb */ color: rgb(31, 68, 139);
/* oklch */ color: oklch(40.2% 0.126 261.8);

Tailwind

colors: {
  custom: {
    50: '#6b77ad',
    500: '#1f448b',
    950: '#000000',
  },
}

SCSS

$custom: #1f448b;
$custom-light: #6b77ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f448b",
  "rgb": {
    "r": 31,
    "g": 68,
    "b": 139
  },
  "hsl": {
    "h": 219.444,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.40224,
    "c": 0.12589,
    "h": 261.8
  },
  "luminance": 0.0629
}

Semantic roles & 50–950 ramp

primary

#1F448B

secondary

#BA944C

accent

#AE41E7

background

#F6F7FA

surface

#ECEDF4

border

#C7C8CE

text

#080810

muted

#7A7B7F

Preview Lab

Preview with #1F448B

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

Preview Lab → · Contrast checker → · Palette generator →