#1F288B#1F288B

#1F288B is a dark, vivid blue. Relative luminance 0.037; OKLCH L 34.6% C 0.161 H 270.7°. Best body text is #FFFFFF at 12.11:1 contrast (WCAG AA passes).

Color values

HEX	#1F288B
RGB	rgb(31, 40, 139)
HSL	hsl(235, 64%, 33%)
HSV	hsv(235, 78%, 55%)
CMYK	cmyk(77.7%, 71.2%, 0%, 45.5%)
CIE-LAB	lab(22.56, 32.70, -55.69)
CIE-LCH	lch(22.56, 64.58, 300.42°)
OKLab	oklab(34.58% 0.002 -0.1612)
OKLCH	oklch(34.58% 0.161 270.7)
XYZ	xyz(5.9825, 3.6723, 24.8146)
Luminance	0.0367 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F288B #8B821F

analogous

#1F5E8B #1F288B #4C1F8B

triadic

#1F288B #8B1F28 #288B1F

tetradic

#1F288B #8B1F5E #8B821F #1F8B4C

square

#1F288B #8B1F5E #8B821F #1F8B4C

split-complementary

#1F288B #8B4C1F #5E8B1F

monochromatic

#090B27 #141A59 #1F288B #2A36BD #4D59D7

Accessibility & contrast

On white

12.11

#1F288B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.73

#1F288B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F288B

12.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F288B	#FFFFFF	#000000	##FFFFFF
##1F288B	1.00	12.11	1.73	12.11
#FFFFFF	12.11	1.00	21.00	1.00
#000000	1.73	21.00	1.00	21.00
##FFFFFF	12.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B8E

Deuteranopia (green-blind)

#003189

Tritanopia (blue-blind)

#004356

Achromatopsia (no color)

#363636

Design tokens & code

CSS

--color: #1f288b;
/* rgb */ color: rgb(31, 40, 139);
/* oklch */ color: oklch(34.6% 0.161 270.7);

Tailwind

colors: {
  custom: {
    50: '#6e62ae',
    500: '#1f288b',
    950: '#000000',
  },
}

SCSS

$custom: #1f288b;
$custom-light: #6e62ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f288b",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 139
  },
  "hsl": {
    "h": 235,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.3458,
    "c": 0.16119,
    "h": 270.7
  },
  "luminance": 0.03673
}

Semantic roles & 50–950 ramp

primary

#1F288B

secondary

#BAB14C

accent

#D941E7

background

#F7F5FA

surface

#EDEAF4

border

#C8C6CE

text

#080510

muted

#7B797F

Preview Lab

Preview with #1F288B

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

Preview Lab → · Contrast checker → · Palette generator →