#1F2971#1F2971

#1F2971 is a dark, vivid blue. Relative luminance 0.031; OKLCH L 32.2% C 0.124 H 271.5°. Best body text is #FFFFFF at 13.01:1 contrast (WCAG AA passes).

Color values

HEX	#1F2971
RGB	rgb(31, 41, 113)
HSL	hsl(233, 57%, 28%)
HSV	hsv(233, 73%, 44%)
CMYK	cmyk(72.6%, 63.7%, 0%, 55.7%)
CIE-LAB	lab(20.32, 22.14, -42.89)
CIE-LCH	lch(20.32, 48.26, 297.30°)
OKLab	oklab(32.18% 0.0032 -0.1237)
OKLCH	oklch(32.18% 0.124 271.5)
XYZ	xyz(4.3376, 3.0690, 15.9834)
Luminance	0.0307 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F2971 #71671F

analogous

#1F5271 #1F2971 #3E1F71

triadic

#1F2971 #711F29 #29711F

tetradic

#1F2971 #711F52 #71671F #1F713E

square

#1F2971 #711F52 #71671F #1F713E

split-complementary

#1F2971 #713E1F #52711F

monochromatic

#070918 #121841 #1F2971 #2C3AA1 #4051CB

Accessibility & contrast

On white

13.01

#1F2971 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.61

#1F2971 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F2971

13.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F2971	#FFFFFF	#000000	##FFFFFF
##1F2971	1.00	13.01	1.61	13.01
#FFFFFF	13.01	1.00	21.00	1.00
#000000	1.61	21.00	1.00	21.00
##FFFFFF	13.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003573

Deuteranopia (green-blind)

#002D70

Tritanopia (blue-blind)

#003B48

Achromatopsia (no color)

#313131

Design tokens & code

CSS

--color: #1f2971;
/* rgb */ color: rgb(31, 41, 113);
/* oklch */ color: oklch(32.2% 0.124 271.5);

Tailwind

colors: {
  custom: {
    50: '#67629a',
    500: '#1f2971',
    950: '#000000',
  },
}

SCSS

$custom: #1f2971;
$custom-light: #67629a;
$custom-dark: #000000;

JSON

{
  "hex": "#1f2971",
  "rgb": {
    "r": 31,
    "g": 41,
    "b": 113
  },
  "hsl": {
    "h": 232.683,
    "s": 56.944,
    "l": 28.235
  },
  "oklch": {
    "l": 0.32181,
    "c": 0.12375,
    "h": 271.5
  },
  "luminance": 0.03069
}

Semantic roles & 50–950 ramp

primary

#1F2971

secondary

#A59947

accent

#CE48E0

background

#F6F5F9

surface

#EBEAF2

border

#C6C6CC

text

#07050E

muted

#7A797E

Preview Lab

Preview with #1F2971

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

Preview Lab → · Contrast checker → · Palette generator →