#1F3F87#1F3F87

#1F3F87 is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.8% C 0.127 H 263.6°. Best body text is #FFFFFF at 9.91:1 contrast (WCAG AA passes).

Color values

HEX	#1F3F87
RGB	rgb(31, 63, 135)
HSL	hsl(222, 63%, 33%)
HSV	hsv(222, 77%, 53%)
CMYK	cmyk(77%, 53.3%, 0%, 47.1%)
CIE-LAB	lab(28.37, 15.46, -43.72)
CIE-LCH	lch(28.37, 46.37, 289.47°)
OKLab	oklab(38.79% -0.0142 -0.1258)
OKLCH	oklch(38.79% 0.127 263.6)
XYZ	xyz(6.7142, 5.5948, 23.6430)
Luminance	0.0560 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3F87 #87671F

analogous

#1F7387 #1F3F87 #331F87

triadic

#1F3F87 #871F3F #3F871F

tetradic

#1F3F87 #871F73 #87671F #1F8733

square

#1F3F87 #871F73 #87671F #1F8733

split-complementary

#1F3F87 #87331F #73871F

monochromatic

#081123 #142855 #1F3F87 #2A56B9 #4B76D6

Accessibility & contrast

On white

9.91

#1F3F87 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#1F3F87 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3F87

9.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3F87	#FFFFFF	#000000	##FFFFFF
##1F3F87	1.00	9.91	2.12	9.91
#FFFFFF	9.91	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0F488A

Deuteranopia (green-blind)

#003E86

Tritanopia (blue-blind)

#00505C

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1f3f87;
/* rgb */ color: rgb(31, 63, 135);
/* oklch */ color: oklch(38.8% 0.127 263.6);

Tailwind

colors: {
  custom: {
    50: '#6b73aa',
    500: '#1f3f87',
    950: '#000000',
  },
}

SCSS

$custom: #1f3f87;
$custom-light: #6b73aa;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3f87",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 135
  },
  "hsl": {
    "h": 221.538,
    "s": 62.651,
    "l": 32.549
  },
  "oklch": {
    "l": 0.38787,
    "c": 0.12661,
    "h": 263.6
  },
  "luminance": 0.05596
}

Semantic roles & 50–950 ramp

primary

#1F3F87

secondary

#B8964A

accent

#B342E6

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #1F3F87

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

Preview Lab → · Contrast checker → · Palette generator →