#1F398C#1F398C

#1F398C is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.9% C 0.142 H 266.3°. Best body text is #FFFFFF at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#1F398C
RGB	rgb(31, 57, 140)
HSL	hsl(226, 64%, 34%)
HSV	hsv(226, 78%, 55%)
CMYK	cmyk(77.9%, 59.3%, 0%, 45.1%)
CIE-LAB	lab(27.05, 21.62, -48.96)
CIE-LCH	lch(27.05, 53.52, 293.82°)
OKLab	oklab(37.91% -0.0091 -0.1413)
OKLCH	oklch(37.91% 0.142 266.3)
XYZ	xyz(6.7602, 5.1103, 25.4360)
Luminance	0.0511 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F398C #8C721F

analogous

#1F6F8C #1F398C #3B1F8C

triadic

#1F398C #8C1F39 #398C1F

tetradic

#1F398C #8C1F6F #8C721F #1F8C3B

square

#1F398C #8C1F6F #8C721F #1F8C3B

split-complementary

#1F398C #8C3B1F #6F8C1F

monochromatic

#091028 #14255A #1F398C #2A4DBE #4E6FD8

Accessibility & contrast

On white

10.38

#1F398C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#1F398C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F398C

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F398C	#FFFFFF	#000000	##FFFFFF
##1F398C	1.00	10.38	2.02	10.38
#FFFFFF	10.38	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458F

Deuteranopia (green-blind)

#003B8A

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f398c;
/* rgb */ color: rgb(31, 57, 140);
/* oklch */ color: oklch(37.9% 0.142 266.3);

Tailwind

colors: {
  custom: {
    50: '#6c6fae',
    500: '#1f398c',
    950: '#000000',
  },
}

SCSS

$custom: #1f398c;
$custom-light: #6c6fae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f398c",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 140
  },
  "hsl": {
    "h": 225.688,
    "s": 63.743,
    "l": 33.529
  },
  "oklch": {
    "l": 0.37914,
    "c": 0.14161,
    "h": 266.3
  },
  "luminance": 0.05111
}

Semantic roles & 50–950 ramp

primary

#1F398C

secondary

#BBA04C

accent

#BF41E7

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1F398C

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

Preview Lab → · Contrast checker → · Palette generator →