#1F3FBC#1F3FBC

#1F3FBC is a dark, vivid blue. Relative luminance 0.075; OKLCH L 43.5% C 0.199 H 266.3°. Best body text is #FFFFFF at 8.42:1 contrast (WCAG AA passes).

Color values

HEX	#1F3FBC
RGB	rgb(31, 63, 188)
HSL	hsl(228, 72%, 43%)
HSV	hsv(228, 84%, 74%)
CMYK	cmyk(83.5%, 66.5%, 0%, 26.3%)
CIE-LAB	lab(32.87, 36.07, -68.39)
CIE-LCH	lch(32.87, 77.32, 297.81°)
OKLab	oklab(43.54% -0.0129 -0.1982)
OKLCH	oklch(43.54% 0.199 266.3)
XYZ	xyz(11.4165, 7.4758, 48.4085)
Luminance	0.0748 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 6.31

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F3FBC #BC9C1F

analogous

#1F8DBC #1F3FBC #4E1FBC

triadic

#1F3FBC #BC1F3F #3FBC1F

tetradic

#1F3FBC #BC1F8D #BC9C1F #1FBC4E

square

#1F3FBC #BC1F8D #BC9C1F #1FBC4E

split-complementary

#1F3FBC #BC4E1F #8DBC1F

monochromatic

#0E1C53 #162D87 #1F3FBC #3A5BDE #6E87E7

Accessibility & contrast

On white

8.42

#1F3FBC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.50

#1F3FBC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F3FBC

8.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F3FBC	#FFFFFF	#000000	##FFFFFF
##1F3FBC	1.00	8.42	2.50	8.42
#FFFFFF	8.42	1.00	21.00	1.00
#000000	2.50	21.00	1.00	21.00
##FFFFFF	8.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055C0

Deuteranopia (green-blind)

#0046BA

Tritanopia (blue-blind)

#006178

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #1f3fbc;
/* rgb */ color: rgb(31, 63, 188);
/* oklch */ color: oklch(43.5% 0.199 266.3);

Tailwind

colors: {
  custom: {
    50: '#7874d1',
    500: '#1f3fbc',
    950: '#000000',
  },
}

SCSS

$custom: #1f3fbc;
$custom-light: #7874d1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f3fbc",
  "rgb": {
    "r": 31,
    "g": 63,
    "b": 188
  },
  "hsl": {
    "h": 227.771,
    "s": 71.689,
    "l": 42.941
  },
  "oklch": {
    "l": 0.43536,
    "c": 0.19859,
    "h": 266.3
  },
  "luminance": 0.07477
}

Semantic roles & 50–950 ramp

primary

#1F3FBC

secondary

#CDB969

accent

#CA39EE

background

#F8F7FD

surface

#EFEDFA

border

#CAC8D3

text

#0B0814

muted

#7C7B83

Preview Lab

Preview with #1F3FBC

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

Preview Lab → · Contrast checker → · Palette generator →