#1F1B73#1F1B73

#1F1B73 is a dark, vivid blue. Relative luminance 0.023; OKLCH L 29.9% C 0.144 H 275.3°. Best body text is #FFFFFF at 14.36:1 contrast (WCAG AA passes).

Color values

HEX	#1F1B73
RGB	rgb(31, 27, 115)
HSL	hsl(243, 62%, 28%)
HSV	hsv(243, 77%, 45%)
CMYK	cmyk(73%, 76.5%, 0%, 54.9%)
CIE-LAB	lab(17.05, 32.19, -49.54)
CIE-LCH	lch(17.05, 59.08, 303.02°)
OKLab	oklab(29.87% 0.0132 -0.1432)
OKLCH	oklch(29.87% 0.144 275.3)
XYZ	xyz(4.0505, 2.3126, 16.4492)
Luminance	0.0231 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F1B73 #6F731B

analogous

#1B4373 #1F1B73 #4B1B73

triadic

#1F1B73 #731F1B #1B731F

tetradic

#1F1B73 #731B43 #6F731B #1B734B

square

#1F1B73 #731B43 #6F731B #1B734B

split-complementary

#1F1B73 #734B1B #43731B

monochromatic

#070619 #120F41 #1F1B73 #2C27A5 #3F38D0

Accessibility & contrast

On white

14.36

#1F1B73 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.46

#1F1B73 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F1B73

14.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F1B73	#FFFFFF	#000000	##FFFFFF
##1F1B73	1.00	14.36	1.46	14.36
#FFFFFF	14.36	1.00	21.00	1.00
#000000	1.46	21.00	1.00	21.00
##FFFFFF	14.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002E76

Deuteranopia (green-blind)

#002671

Tritanopia (blue-blind)

#003445

Achromatopsia (no color)

#2A2A2A

Design tokens & code

CSS

--color: #1f1b73;
/* rgb */ color: rgb(31, 27, 115);
/* oklch */ color: oklch(29.9% 0.144 275.3);

Tailwind

colors: {
  custom: {
    50: '#69599c',
    500: '#1f1b73',
    950: '#000000',
  },
}

SCSS

$custom: #1f1b73;
$custom-light: #69599c;
$custom-dark: #000000;

JSON

{
  "hex": "#1f1b73",
  "rgb": {
    "r": 31,
    "g": 27,
    "b": 115
  },
  "hsl": {
    "h": 242.727,
    "s": 61.972,
    "l": 27.843
  },
  "oklch": {
    "l": 0.29869,
    "c": 0.14381,
    "h": 275.3
  },
  "luminance": 0.02313
}

Semantic roles & 50–950 ramp

primary

#1F1B73

secondary

#A3A842

accent

#E543DE

background

#F6F5F9

surface

#ECE9F2

border

#C7C5CC

text

#07030E

muted

#7A787E

Preview Lab

Preview with #1F1B73

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

Preview Lab → · Contrast checker → · Palette generator →