#1F289E#1F289E

#1F289E is a dark, vivid blue. Relative luminance 0.043; OKLCH L 36.6% C 0.186 H 269.8°. Best body text is #FFFFFF at 11.32:1 contrast (WCAG AA passes).

Color values

HEX	#1F289E
RGB	rgb(31, 40, 158)
HSL	hsl(236, 67%, 37%)
HSV	hsv(236, 80%, 62%)
CMYK	cmyk(80.4%, 74.7%, 0%, 38%)
CIE-LAB	lab(24.57, 39.54, -64.09)
CIE-LCH	lch(24.57, 75.31, 301.67°)
OKLab	oklab(36.62% -0.0006 -0.1856)
OKLCH	oklch(36.62% 0.186 269.8)
XYZ	xyz(7.4933, 4.2767, 32.7717)
Luminance	0.0428 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F289E #9E951F

analogous

#1F689E #1F289E #561F9E

triadic

#1F289E #9E1F28 #289E1F

tetradic

#1F289E #9E1F68 #9E951F #1F9E56

square

#1F289E #9E1F68 #9E951F #1F9E56

split-complementary

#1F289E #9E561F #689E1F

monochromatic

#0B0E38 #151B6B #1F289E #2935D1 #5962DE

Accessibility & contrast

On white

11.32

#1F289E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#1F289E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F289E

11.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F289E	#FFFFFF	#000000	##FFFFFF
##1F289E	1.00	11.32	1.86	11.32
#FFFFFF	11.32	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0041A1

Deuteranopia (green-blind)

#00349C

Tritanopia (blue-blind)

#004A61

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f289e;
/* rgb */ color: rgb(31, 40, 158);
/* oklch */ color: oklch(36.6% 0.186 269.8);

Tailwind

colors: {
  custom: {
    50: '#7363bc',
    500: '#1f289e',
    950: '#000000',
  },
}

SCSS

$custom: #1f289e;
$custom-light: #7363bc;
$custom-dark: #000000;

JSON

{
  "hex": "#1f289e",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 158
  },
  "hsl": {
    "h": 235.748,
    "s": 67.196,
    "l": 37.059
  },
  "oklch": {
    "l": 0.36622,
    "c": 0.18565,
    "h": 269.8
  },
  "luminance": 0.04278
}

Semantic roles & 50–950 ramp

primary

#1F289E

secondary

#C2BB56

accent

#DE3EEA

background

#F7F5FB

surface

#EEEAF7

border

#C9C6D0

text

#0A0512

muted

#7C7981

Preview Lab

Preview with #1F289E

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

Preview Lab → · Contrast checker → · Palette generator →