#1F289C#1F289C

#1F289C is a dark, vivid blue. Relative luminance 0.042; OKLCH L 36.4% C 0.183 H 269.9°. Best body text is #FFFFFF at 11.40:1 contrast (WCAG AA passes).

Color values

HEX	#1F289C
RGB	rgb(31, 40, 156)
HSL	hsl(236, 67%, 37%)
HSV	hsv(236, 80%, 61%)
CMYK	cmyk(80.1%, 74.4%, 0%, 38.8%)
CIE-LAB	lab(24.35, 38.84, -63.23)
CIE-LCH	lch(24.35, 74.20, 301.56°)
OKLab	oklab(36.4% -0.0003 -0.1831)
OKLCH	oklch(36.4% 0.183 269.9)
XYZ	xyz(7.3226, 4.2084, 31.8724)
Luminance	0.0421 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F289C #9C931F

analogous

#1F679C #1F289C #551F9C

triadic

#1F289C #9C1F28 #289C1F

tetradic

#1F289C #9C1F67 #9C931F #1F9C55

square

#1F289C #9C1F67 #9C931F #1F9C55

split-complementary

#1F289C #9C551F #679C1F

monochromatic

#0B0E36 #151B69 #1F289C #2935CF #5861DE

Accessibility & contrast

On white

11.40

#1F289C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#1F289C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F289C

11.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F289C	#FFFFFF	#000000	##FFFFFF
##1F289C	1.00	11.40	1.84	11.40
#FFFFFF	11.40	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00409F

Deuteranopia (green-blind)

#00349A

Tritanopia (blue-blind)

#004A60

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f289c;
/* rgb */ color: rgb(31, 40, 156);
/* oklch */ color: oklch(36.4% 0.183 269.9);

Tailwind

colors: {
  custom: {
    50: '#7263ba',
    500: '#1f289c',
    950: '#000000',
  },
}

SCSS

$custom: #1f289c;
$custom-light: #7263ba;
$custom-dark: #000000;

JSON

{
  "hex": "#1f289c",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 156
  },
  "hsl": {
    "h": 235.68,
    "s": 66.845,
    "l": 36.667
  },
  "oklch": {
    "l": 0.36402,
    "c": 0.18314,
    "h": 269.9
  },
  "luminance": 0.04209
}

Semantic roles & 50–950 ramp

primary

#1F289C

secondary

#C1BA55

accent

#DD3EEA

background

#F7F5FB

surface

#EEEAF6

border

#C9C6D0

text

#090512

muted

#7B7981

Preview Lab

Preview with #1F289C

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

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