#1F289B#1F289B

#1F289B is a dark, vivid blue. Relative luminance 0.042; OKLCH L 36.3% C 0.182 H 269.9°. Best body text is #FFFFFF at 11.44:1 contrast (WCAG AA passes).

Color values

HEX	#1F289B
RGB	rgb(31, 40, 155)
HSL	hsl(236, 67%, 36%)
HSV	hsv(236, 80%, 61%)
CMYK	cmyk(80%, 74.2%, 0%, 39.2%)
CIE-LAB	lab(24.24, 38.48, -62.80)
CIE-LCH	lch(24.24, 73.65, 301.50°)
OKLab	oklab(36.29% -0.0002 -0.1819)
OKLCH	oklch(36.29% 0.182 269.9)
XYZ	xyz(7.2382, 4.1746, 31.4283)
Luminance	0.0418 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F289B #9B921F

analogous

#1F669B #1F289B #541F9B

triadic

#1F289B #9B1F28 #289B1F

tetradic

#1F289B #9B1F66 #9B921F #1F9B54

square

#1F289B #9B1F66 #9B921F #1F9B54

split-complementary

#1F289B #9B541F #669B1F

monochromatic

#0B0E35 #151B68 #1F289B #2935CE #5761DD

Accessibility & contrast

On white

11.44

#1F289B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#1F289B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F289B

11.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F289B	#FFFFFF	#000000	##FFFFFF
##1F289B	1.00	11.44	1.84	11.44
#FFFFFF	11.44	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00409E

Deuteranopia (green-blind)

#003399

Tritanopia (blue-blind)

#00495F

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f289b;
/* rgb */ color: rgb(31, 40, 155);
/* oklch */ color: oklch(36.3% 0.182 269.9);

Tailwind

colors: {
  custom: {
    50: '#7263ba',
    500: '#1f289b',
    950: '#000000',
  },
}

SCSS

$custom: #1f289b;
$custom-light: #7263ba;
$custom-dark: #000000;

JSON

{
  "hex": "#1f289b",
  "rgb": {
    "r": 31,
    "g": 40,
    "b": 155
  },
  "hsl": {
    "h": 235.645,
    "s": 66.667,
    "l": 36.471
  },
  "oklch": {
    "l": 0.36293,
    "c": 0.18188,
    "h": 269.9
  },
  "luminance": 0.04175
}

Semantic roles & 50–950 ramp

primary

#1F289B

secondary

#C1B955

accent

#DD3EEA

background

#F7F5FB

surface

#EEEAF6

border

#C9C6D0

text

#090512

muted

#7B7981

Preview Lab

Preview with #1F289B

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

Preview Lab → · Contrast checker → · Palette generator →