#1F398B#1F398B

#1F398B is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.8% C 0.140 H 266.3°. Best body text is #FFFFFF at 10.41:1 contrast (WCAG AA passes).

Color values

HEX	#1F398B
RGB	rgb(31, 57, 139)
HSL	hsl(226, 64%, 33%)
HSV	hsv(226, 78%, 55%)
CMYK	cmyk(77.7%, 59%, 0%, 45.5%)
CIE-LAB	lab(26.96, 21.22, -48.47)
CIE-LCH	lch(26.96, 52.91, 293.64°)
OKLab	oklab(37.83% -0.0091 -0.1399)
OKLCH	oklch(37.83% 0.14 266.3)
XYZ	xyz(6.6868, 5.0809, 25.0494)
Luminance	0.0508 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F398B #8B711F

analogous

#1F6F8B #1F398B #3B1F8B

triadic

#1F398B #8B1F39 #398B1F

tetradic

#1F398B #8B1F6F #8B711F #1F8B3B

square

#1F398B #8B1F6F #8B711F #1F8B3B

split-complementary

#1F398B #8B3B1F #6F8B1F

monochromatic

#091027 #142459 #1F398B #2A4EBD #4D6ED7

Accessibility & contrast

On white

10.41

#1F398B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#1F398B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F398B

10.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F398B	#FFFFFF	#000000	##FFFFFF
##1F398B	1.00	10.41	2.02	10.41
#FFFFFF	10.41	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00458E

Deuteranopia (green-blind)

#003B89

Tritanopia (blue-blind)

#004D5C

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f398b;
/* rgb */ color: rgb(31, 57, 139);
/* oklch */ color: oklch(37.8% 0.140 266.3);

Tailwind

colors: {
  custom: {
    50: '#6c6fae',
    500: '#1f398b',
    950: '#000000',
  },
}

SCSS

$custom: #1f398b;
$custom-light: #6c6fae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f398b",
  "rgb": {
    "r": 31,
    "g": 57,
    "b": 139
  },
  "hsl": {
    "h": 225.556,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.37827,
    "c": 0.1402,
    "h": 266.3
  },
  "luminance": 0.05082
}

Semantic roles & 50–950 ramp

primary

#1F398B

secondary

#BAA04C

accent

#BF41E7

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #1F398B

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

Preview Lab → · Contrast checker → · Palette generator →