#1F3D71#1F3D71

#1F3D71 is a dark, moderate blue. Relative luminance 0.048; OKLCH L 36.6% C 0.097 H 260.6°. Best body text is #FFFFFF at 10.69:1 contrast (WCAG AA passes).

Color values

HEX	#1F3D71
RGB	rgb(31, 61, 113)
HSL	hsl(218, 57%, 28%)
HSV	hsv(218, 73%, 44%)
CMYK	cmyk(72.6%, 46%, 0%, 55.7%)
CIE-LAB	lab(26.22, 8.01, -33.35)
CIE-LCH	lch(26.22, 34.30, 283.50°)
OKLab	oklab(36.65% -0.0158 -0.0954)
OKLCH	oklch(36.65% 0.097 260.6)
XYZ	xyz(5.2134, 4.8205, 16.2753)
Luminance	0.0482 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3D71 #71531F

analogous

#1F6671 #1F3D71 #2A1F71

triadic

#1F3D71 #711F3D #3D711F

tetradic

#1F3D71 #711F66 #71531F #1F712A

square

#1F3D71 #711F66 #71531F #1F712A

split-complementary

#1F3D71 #712A1F #66711F

monochromatic

#070D18 #122341 #1F3D71 #2C57A1 #4073CB

Accessibility & contrast

On white

10.69

#1F3D71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#1F3D71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3D71

10.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3D71	#FFFFFF	#000000	##FFFFFF
##1F3D71	1.00	10.69	1.96	10.69
#FFFFFF	10.69	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#244273

Deuteranopia (green-blind)

#153B70

Tritanopia (blue-blind)

#004951

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1f3d71;
/* rgb */ color: rgb(31, 61, 113);
/* oklch */ color: oklch(36.6% 0.097 260.6);

Tailwind

colors: {
  custom: {
    50: '#66729a',
    500: '#1f3d71',
    950: '#000000',
  },
}

SCSS

$custom: #1f3d71;
$custom-light: #66729a;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3d71",
  "rgb": {
    "r": 31,
    "g": 61,
    "b": 113
  },
  "hsl": {
    "h": 218.049,
    "s": 56.944,
    "l": 28.235
  },
  "oklch": {
    "l": 0.36646,
    "c": 0.09666,
    "h": 260.6
  },
  "luminance": 0.04821
}

Semantic roles & 50–950 ramp

primary

#1F3D71

secondary

#A58347

accent

#A848E0

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #1F3D71

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

Preview Lab → · Contrast checker → · Palette generator →