#1F3FB4#1F3FB4

#1F3FB4 is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.8% C 0.188 H 266.2°. Best body text is #FFFFFF at 8.65:1 contrast (WCAG AA passes).

Color values

HEX	#1F3FB4
RGB	rgb(31, 63, 180)
HSL	hsl(227, 71%, 41%)
HSV	hsv(227, 83%, 71%)
CMYK	cmyk(82.8%, 65%, 0%, 29.4%)
CIE-LAB	lab(32.12, 33.07, -64.88)
CIE-LCH	lch(32.12, 72.82, 297.01°)
OKLab	oklab(42.77% -0.0126 -0.1879)
OKLCH	oklch(42.77% 0.188 266.2)
XYZ	xyz(10.5779, 7.1403, 43.9919)
Luminance	0.0714 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3FB4 #B4941F

analogous

#1F8AB4 #1F3FB4 #4A1FB4

triadic

#1F3FB4 #B41F3F #3FB41F

tetradic

#1F3FB4 #B41F8A #B4941F #1FB44A

square

#1F3FB4 #B41F8A #B4941F #1FB44A

split-complementary

#1F3FB4 #B44A1F #8AB41F

monochromatic

#0D1A4C #162D80 #1F3FB4 #3458DC #6883E5

Accessibility & contrast

On white

8.65

#1F3FB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.43

#1F3FB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3FB4

8.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3FB4	#FFFFFF	#000000	##FFFFFF
##1F3FB4	1.00	8.65	2.43	8.65
#FFFFFF	8.65	1.00	21.00	1.00
#000000	2.43	21.00	1.00	21.00
##FFFFFF	8.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B8

Deuteranopia (green-blind)

#0045B2

Tritanopia (blue-blind)

#005E74

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #1f3fb4;
/* rgb */ color: rgb(31, 63, 180);
/* oklch */ color: oklch(42.8% 0.188 266.2);

Tailwind

colors: {
  custom: {
    50: '#7673cc',
    500: '#1f3fb4',
    950: '#000000',
  },
}

SCSS

$custom: #1f3fb4;
$custom-light: #7673cc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3fb4",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 180
  },
  "hsl": {
    "h": 227.114,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.42765,
    "c": 0.18833,
    "h": 266.2
  },
  "luminance": 0.07142
}

Semantic roles & 50–950 ramp

primary

#1F3FB4

secondary

#CBB564

accent

#C73AED

background

#F7F7FC

surface

#EEEDF9

border

#C9C8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #1F3FB4

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

Preview Lab → · Contrast checker → · Palette generator →