#1F33A0#1F33A0

#1F33A0 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.6% C 0.176 H 268.1°. Best body text is #FFFFFF at 10.30:1 contrast (WCAG AA passes).

Color values

HEX	#1F33A0
RGB	rgb(31, 51, 160)
HSL	hsl(231, 68%, 37%)
HSV	hsv(231, 81%, 63%)
CMYK	cmyk(80.6%, 68.1%, 0%, 37.3%)
CIE-LAB	lab(27.29, 33.38, -60.82)
CIE-LCH	lch(27.29, 69.38, 298.76°)
OKLab	oklab(38.65% -0.0057 -0.1761)
OKLCH	oklch(38.65% 0.176 268.1)
XYZ	xyz(8.0919, 5.1961, 33.8274)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F33A0 #A08C1F

analogous

#1F73A0 #1F33A0 #4C1FA0

triadic

#1F33A0 #A01F33 #33A01F

tetradic

#1F33A0 #A01F73 #A08C1F #1FA04C

square

#1F33A0 #A01F73 #A08C1F #1FA04C

split-complementary

#1F33A0 #A04C1F #73A01F

monochromatic

#0B1239 #15236D #1F33A0 #2943D3 #5A6FDF

Accessibility & contrast

On white

10.30

#1F33A0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#1F33A0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F33A0

10.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F33A0	#FFFFFF	#000000	##FFFFFF
##1F33A0	1.00	10.30	2.04	10.30
#FFFFFF	10.30	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0047A3

Deuteranopia (green-blind)

#003A9E

Tritanopia (blue-blind)

#005165

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f33a0;
/* rgb */ color: rgb(31, 51, 160);
/* oklch */ color: oklch(38.6% 0.176 268.1);

Tailwind

colors: {
  custom: {
    50: '#726bbd',
    500: '#1f33a0',
    950: '#000000',
  },
}

SCSS

$custom: #1f33a0;
$custom-light: #726bbd;
$custom-dark: #000000;

JSON

{
  "hex": "#1f33a0",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 160
  },
  "hsl": {
    "h": 230.698,
    "s": 67.539,
    "l": 37.451
  },
  "oklch": {
    "l": 0.38646,
    "c": 0.17624,
    "h": 268.1
  },
  "luminance": 0.05197
}

Semantic roles & 50–950 ramp

primary

#1F33A0

secondary

#C3B258

accent

#D03DEA

background

#F7F6FB

surface

#EEEBF7

border

#C9C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #1F33A0

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

Preview Lab → · Contrast checker → · Palette generator →