#1F33A8#1F33A8

#1F33A8 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 39.5% C 0.187 H 268.1°. Best body text is #FFFFFF at 10.01:1 contrast (WCAG AA passes).

Color values

HEX	#1F33A8
RGB	rgb(31, 51, 168)
HSL	hsl(231, 69%, 39%)
HSV	hsv(231, 82%, 66%)
CMYK	cmyk(81.5%, 69.6%, 0%, 34.1%)
CIE-LAB	lab(28.07, 36.34, -64.37)
CIE-LCH	lch(28.07, 73.92, 299.45°)
OKLab	oklab(39.46% -0.0063 -0.1865)
OKLCH	oklch(39.46% 0.187 268.1)
XYZ	xyz(8.8143, 5.4851, 37.6324)
Luminance	0.0549 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F33A8 #A8941F

analogous

#1F78A8 #1F33A8 #501FA8

triadic

#1F33A8 #A81F33 #33A81F

tetradic

#1F33A8 #A81F78 #A8941F #1FA850

square

#1F33A8 #A81F78 #A8941F #1FA850

split-complementary

#1F33A8 #A8501F #78A81F

monochromatic

#0C1441 #152374 #1F33A8 #2C45D8 #6073E2

Accessibility & contrast

On white

10.01

#1F33A8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#1F33A8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F33A8

10.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F33A8	#FFFFFF	#000000	##FFFFFF
##1F33A8	1.00	10.01	2.10	10.01
#FFFFFF	10.01	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	10.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0049AC

Deuteranopia (green-blind)

#003CA6

Tritanopia (blue-blind)

#005369

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #1f33a8;
/* rgb */ color: rgb(31, 51, 168);
/* oklch */ color: oklch(39.5% 0.187 268.1);

Tailwind

colors: {
  custom: {
    50: '#746bc3',
    500: '#1f33a8',
    950: '#000000',
  },
}

SCSS

$custom: #1f33a8;
$custom-light: #746bc3;
$custom-dark: #000000;

JSON

{
  "hex": "#1f33a8",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 168
  },
  "hsl": {
    "h": 231.241,
    "s": 68.844,
    "l": 39.02
  },
  "oklch": {
    "l": 0.39457,
    "c": 0.18658,
    "h": 268.1
  },
  "luminance": 0.05486
}

Semantic roles & 50–950 ramp

primary

#1F33A8

secondary

#C6B75D

accent

#D23CEC

background

#F7F6FC

surface

#EEEBF8

border

#C9C6D1

text

#0A0613

muted

#7C7A82

Preview Lab

Preview with #1F33A8

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

Preview Lab → · Contrast checker → · Palette generator →