#1F31B4#1F31B4

#1F31B4 is a dark, highly saturated blue. Relative luminance 0.058; OKLCH L 40.4% C 0.204 H 268.1°. Best body text is #FFFFFF at 9.74:1 contrast (WCAG AA passes).

Color values

HEX	#1F31B4
RGB	rgb(31, 49, 180)
HSL	hsl(233, 71%, 41%)
HSV	hsv(233, 83%, 71%)
CMYK	cmyk(82.8%, 72.8%, 0%, 29.4%)
CIE-LAB	lab(28.86, 41.90, -70.26)
CIE-LCH	lch(28.86, 81.81, 300.81°)
OKLab	oklab(40.39% -0.0067 -0.2036)
OKLCH	oklch(40.39% 0.204 268.1)
XYZ	xyz(9.8988, 5.7820, 43.7655)
Luminance	0.0578 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.72

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F31B4 #B4A21F

analogous

#1F7CB4 #1F31B4 #581FB4

triadic

#1F31B4 #B41F31 #31B41F

tetradic

#1F31B4 #B41F7C #B4A21F #1FB458

square

#1F31B4 #B41F7C #B4A21F #1FB458

split-complementary

#1F31B4 #B4581F #7CB41F

monochromatic

#0D154C #162380 #1F31B4 #3448DC #6877E5

Accessibility & contrast

On white

9.74

#1F31B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#1F31B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F31B4

9.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F31B4	#FFFFFF	#000000	##FFFFFF
##1F31B4	1.00	9.74	2.16	9.74
#FFFFFF	9.74	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BB8

Deuteranopia (green-blind)

#003DB2

Tritanopia (blue-blind)

#00576F

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #1f31b4;
/* rgb */ color: rgb(31, 49, 180);
/* oklch */ color: oklch(40.4% 0.204 268.1);

Tailwind

colors: {
  custom: {
    50: '#786acc',
    500: '#1f31b4',
    950: '#000000',
  },
}

SCSS

$custom: #1f31b4;
$custom-light: #786acc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f31b4",
  "rgb": {
    "r": 31,
    "g": 49,
    "b": 180
  },
  "hsl": {
    "h": 232.752,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.40389,
    "c": 0.20375,
    "h": 268.1
  },
  "luminance": 0.05783
}

Semantic roles & 50–950 ramp

primary

#1F31B4

secondary

#CBBE64

accent

#D83AED

background

#F8F6FC

surface

#EFEBF9

border

#CAC6D2

text

#0B0614

muted

#7C7A82

Preview Lab

Preview with #1F31B4

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

Preview Lab → · Contrast checker → · Palette generator →