#1F359B#1F359B

#1F359B is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.5% C 0.167 H 267.8°. Best body text is #FFFFFF at 10.29:1 contrast (WCAG AA passes).

Color values

HEX	#1F359B
RGB	rgb(31, 53, 155)
HSL	hsl(229, 67%, 36%)
HSV	hsv(229, 80%, 61%)
CMYK	cmyk(80%, 65.8%, 0%, 39.2%)
CIE-LAB	lab(27.31, 30.18, -57.75)
CIE-LCH	lch(27.31, 65.16, 297.59°)
OKLab	oklab(38.52% -0.0065 -0.1671)
OKLCH	oklch(38.52% 0.167 267.8)
XYZ	xyz(7.7525, 5.2032, 31.5997)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F359B #9B851F

analogous

#1F739B #1F359B #471F9B

triadic

#1F359B #9B1F35 #359B1F

tetradic

#1F359B #9B1F73 #9B851F #1F9B47

square

#1F359B #9B1F73 #9B851F #1F9B47

split-complementary

#1F359B #9B471F #739B1F

monochromatic

#0B1235 #152468 #1F359B #2946CE #576FDD

Accessibility & contrast

On white

10.29

#1F359B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#1F359B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F359B

10.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F359B	#FFFFFF	#000000	##FFFFFF
##1F359B	1.00	10.29	2.04	10.29
#FFFFFF	10.29	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00469E

Deuteranopia (green-blind)

#003B99

Tritanopia (blue-blind)

#005063

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #1f359b;
/* rgb */ color: rgb(31, 53, 155);
/* oklch */ color: oklch(38.5% 0.167 267.8);

Tailwind

colors: {
  custom: {
    50: '#716cb9',
    500: '#1f359b',
    950: '#000000',
  },
}

SCSS

$custom: #1f359b;
$custom-light: #716cb9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f359b",
  "rgb": {
    "r": 31,
    "g": 53,
    "b": 155
  },
  "hsl": {
    "h": 229.355,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.38515,
    "c": 0.16728,
    "h": 267.8
  },
  "luminance": 0.05204
}

Semantic roles & 50–950 ramp

primary

#1F359B

secondary

#C1AE55

accent

#CB3EEA

background

#F7F6FB

surface

#EDEBF6

border

#C8C6D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1F359B

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

Preview Lab → · Contrast checker → · Palette generator →