#1F2871#1F2871

#1F2871 is a dark, vivid blue. Relative luminance 0.030; OKLCH L 32.0% C 0.125 H 271.9°. Best body text is #FFFFFF at 13.12:1 contrast (WCAG AA passes).

Color values

HEX	#1F2871
RGB	rgb(31, 40, 113)
HSL	hsl(233, 57%, 28%)
HSV	hsv(233, 73%, 44%)
CMYK	cmyk(72.6%, 64.6%, 0%, 55.7%)
CIE-LAB	lab(20.05, 22.84, -43.33)
CIE-LCH	lch(20.05, 48.98, 297.79°)
OKLab	oklab(31.98% 0.0041 -0.125)
OKLCH	oklch(31.98% 0.125 271.9)
XYZ	xyz(4.3035, 3.0007, 15.9720)
Luminance	0.0300 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F2871 #71681F

analogous

#1F5171 #1F2871 #3F1F71

triadic

#1F2871 #711F28 #28711F

tetradic

#1F2871 #711F51 #71681F #1F713F

square

#1F2871 #711F51 #71681F #1F713F

split-complementary

#1F2871 #713F1F #51711F

monochromatic

#070818 #121741 #1F2871 #2C39A1 #404FCB

Accessibility & contrast

On white

13.12

#1F2871 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.60

#1F2871 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F2871

13.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F2871	#FFFFFF	#000000	##FFFFFF
##1F2871	1.00	13.12	1.60	13.12
#FFFFFF	13.12	1.00	21.00	1.00
#000000	1.60	21.00	1.00	21.00
##FFFFFF	13.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003473

Deuteranopia (green-blind)

#002D70

Tritanopia (blue-blind)

#003B48

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #1f2871;
/* rgb */ color: rgb(31, 40, 113);
/* oklch */ color: oklch(32.0% 0.125 271.9);

Tailwind

colors: {
  custom: {
    50: '#67619a',
    500: '#1f2871',
    950: '#000000',
  },
}

SCSS

$custom: #1f2871;
$custom-light: #67619a;
$custom-dark: #000000;

JSON

{
  "hex": "#1f2871",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 113
  },
  "hsl": {
    "h": 233.415,
    "s": 56.944,
    "l": 28.235
  },
  "oklch": {
    "l": 0.31981,
    "c": 0.12509,
    "h": 271.9
  },
  "luminance": 0.03001
}

Semantic roles & 50–950 ramp

primary

#1F2871

secondary

#A59B47

accent

#CF48E0

background

#F6F5F9

surface

#EBEAF2

border

#C6C6CC

text

#07050E

muted

#7A797E

Preview Lab

Preview with #1F2871

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

Preview Lab → · Contrast checker → · Palette generator →