#1F288E#1F288E

#1F288E is a dark, vivid blue. Relative luminance 0.038; OKLCH L 34.9% C 0.165 H 270.6°. Best body text is #FFFFFF at 11.98:1 contrast (WCAG AA passes).

Color values

HEX	#1F288E
RGB	rgb(31, 40, 142)
HSL	hsl(235, 64%, 34%)
HSV	hsv(235, 78%, 56%)
CMYK	cmyk(78.2%, 71.8%, 0%, 44.3%)
CIE-LAB	lab(22.87, 33.80, -57.05)
CIE-LCH	lch(22.87, 66.31, 300.65°)
OKLab	oklab(34.9% 0.0016 -0.1651)
OKLCH	oklch(34.9% 0.165 270.6)
XYZ	xyz(6.2047, 3.7612, 25.9849)
Luminance	0.0376 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F288E #8E851F

analogous

#1F608E #1F288E #4E1F8E

triadic

#1F288E #8E1F28 #288E1F

tetradic

#1F288E #8E1F60 #8E851F #1F8E4E

square

#1F288E #8E1F60 #8E851F #1F8E4E

split-complementary

#1F288E #8E4E1F #608E1F

monochromatic

#090C2A #141A5C #1F288E #2A36C0 #4F5AD9

Accessibility & contrast

On white

11.98

#1F288E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.75

#1F288E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F288E

11.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F288E	#FFFFFF	#000000	##FFFFFF
##1F288E	1.00	11.98	1.75	11.98
#FFFFFF	11.98	1.00	21.00	1.00
#000000	1.75	21.00	1.00	21.00
##FFFFFF	11.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003C91

Deuteranopia (green-blind)

#00318C

Tritanopia (blue-blind)

#004458

Achromatopsia (no color)

#373737

Design tokens & code

CSS

--color: #1f288e;
/* rgb */ color: rgb(31, 40, 142);
/* oklch */ color: oklch(34.9% 0.165 270.6);

Tailwind

colors: {
  custom: {
    50: '#6e62b0',
    500: '#1f288e',
    950: '#000000',
  },
}

SCSS

$custom: #1f288e;
$custom-light: #6e62b0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f288e",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 142
  },
  "hsl": {
    "h": 235.135,
    "s": 64.162,
    "l": 33.922
  },
  "oklch": {
    "l": 0.34896,
    "c": 0.16515,
    "h": 270.6
  },
  "luminance": 0.03762
}

Semantic roles & 50–950 ramp

primary

#1F288E

secondary

#BBB34D

accent

#DA41E7

background

#F7F5FB

surface

#EDEAF6

border

#C8C6D0

text

#080511

muted

#7B7980

Preview Lab

Preview with #1F288E

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

Preview Lab → · Contrast checker → · Palette generator →