#1F33A7#1F33A7

#1F33A7 is a dark, vivid blue. Relative luminance 0.054; OKLCH L 39.4% C 0.185 H 268.1°. Best body text is #FFFFFF at 10.05:1 contrast (WCAG AA passes).

Color values

HEX	#1F33A7
RGB	rgb(31, 51, 167)
HSL	hsl(231, 69%, 39%)
HSV	hsv(231, 81%, 65%)
CMYK	cmyk(81.4%, 69.5%, 0%, 34.5%)
CIE-LAB	lab(27.97, 35.97, -63.93)
CIE-LCH	lch(27.97, 73.35, 299.37°)
OKLab	oklab(39.36% -0.0062 -0.1852)
OKLCH	oklch(39.36% 0.185 268.1)
XYZ	xyz(8.7215, 5.4480, 37.1436)
Luminance	0.0545 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F33A7 #A7931F

analogous

#1F77A7 #1F33A7 #4F1FA7

triadic

#1F33A7 #A71F33 #33A71F

tetradic

#1F33A7 #A71F77 #A7931F #1FA74F

square

#1F33A7 #A71F77 #A7931F #1FA74F

split-complementary

#1F33A7 #A74F1F #77A71F

monochromatic

#0C1340 #152373 #1F33A7 #2B45D8 #5F72E1

Accessibility & contrast

On white

10.05

#1F33A7 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#1F33A7 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F33A7

10.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F33A7	#FFFFFF	#000000	##FFFFFF
##1F33A7	1.00	10.05	2.09	10.05
#FFFFFF	10.05	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0049AB

Deuteranopia (green-blind)

#003BA5

Tritanopia (blue-blind)

#005369

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1f33a7;
/* rgb */ color: rgb(31, 51, 167);
/* oklch */ color: oklch(39.4% 0.185 268.1);

Tailwind

colors: {
  custom: {
    50: '#746bc2',
    500: '#1f33a7',
    950: '#000000',
  },
}

SCSS

$custom: #1f33a7;
$custom-light: #746bc2;
$custom-dark: #000000;

JSON

{
  "hex": "#1f33a7",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 167
  },
  "hsl": {
    "h": 231.176,
    "s": 68.687,
    "l": 38.824
  },
  "oklch": {
    "l": 0.39355,
    "c": 0.18531,
    "h": 268.1
  },
  "luminance": 0.05449
}

Semantic roles & 50–950 ramp

primary

#1F33A7

secondary

#C6B65C

accent

#D23CEC

background

#F7F6FC

surface

#EEEBF8

border

#C9C6D1

text

#0A0613

muted

#7C7A82

Preview Lab

Preview with #1F33A7

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

Preview Lab → · Contrast checker → · Palette generator →