#1F156B#1F156B

#1F156B is a dark, vivid blue. Relative luminance 0.019; OKLCH L 28.1% C 0.140 H 277.7°. Best body text is #FFFFFF at 15.24:1 contrast (WCAG AA passes).

Color values

HEX	#1F156B
RGB	rgb(31, 21, 107)
HSL	hsl(247, 67%, 25%)
HSV	hsv(247, 80%, 42%)
CMYK	cmyk(71%, 80.4%, 0%, 58%)
CIE-LAB	lab(14.89, 32.97, -47.89)
CIE-LCH	lch(14.89, 58.14, 304.54°)
OKLab	oklab(28.08% 0.0187 -0.1384)
OKLCH	oklch(28.08% 0.14 277.7)
XYZ	xyz(3.4862, 1.8889, 14.0879)
Luminance	0.0189 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F156B #616B15

analogous

#15366B #1F156B #4A156B

triadic

#1F156B #6B1F15 #156B1F

tetradic

#1F156B #6B1536 #616B15 #156B4A

square

#1F156B #6B1536 #616B15 #156B4A

split-complementary

#1F156B #6B4A15 #366B15

monochromatic

#07051A #100B38 #1F156B #2E1F9E #3D29D1

Accessibility & contrast

On white

15.24

#1F156B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.38

#1F156B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F156B

15.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F156B	#FFFFFF	#000000	##FFFFFF
##1F156B	1.00	15.24	1.38	15.24
#FFFFFF	15.24	1.00	21.00	1.00
#000000	1.38	21.00	1.00	21.00
##FFFFFF	15.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00296D

Deuteranopia (green-blind)

#002269

Tritanopia (blue-blind)

#002E3F

Achromatopsia (no color)

#252525

Design tokens & code

CSS

--color: #1f156b;
/* rgb */ color: rgb(31, 21, 107);
/* oklch */ color: oklch(28.1% 0.140 277.7);

Tailwind

colors: {
  custom: {
    50: '#675496',
    500: '#1f156b',
    950: '#000000',
  },
}

SCSS

$custom: #1f156b;
$custom-light: #675496;
$custom-dark: #000000;

JSON

{
  "hex": "#1f156b",
  "rgb": {
    "r": 31,
    "g": 21,
    "b": 107
  },
  "hsl": {
    "h": 246.977,
    "s": 67.188,
    "l": 25.098
  },
  "oklch": {
    "l": 0.28077,
    "c": 0.13961,
    "h": 277.7
  },
  "luminance": 0.01889
}

Semantic roles & 50–950 ramp

primary

#1F156B

secondary

#96A23A

accent

#EA3ED6

background

#F6F4F9

surface

#EBE8F2

border

#C6C4CC

text

#07030D

muted

#7A787E

Preview Lab

Preview with #1F156B

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

Preview Lab → · Contrast checker → · Palette generator →