#1F258B#1F258B

#1F258B is a dark, vivid blue. Relative luminance 0.035; OKLCH L 34.1% C 0.165 H 271.2°. Best body text is #FFFFFF at 12.38:1 contrast (WCAG AA passes).

Color values

HEX	#1F258B
RGB	rgb(31, 37, 139)
HSL	hsl(237, 64%, 33%)
HSV	hsv(237, 78%, 55%)
CMYK	cmyk(77.7%, 73.4%, 0%, 45.5%)
CIE-LAB	lab(21.86, 34.60, -56.83)
CIE-LCH	lch(21.86, 66.53, 301.34°)
OKLab	oklab(34.08% 0.0035 -0.1645)
OKLCH	oklch(34.08% 0.165 271.2)
XYZ	xyz(5.8853, 3.4779, 24.7822)
Luminance	0.0348 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F258B #8B851F

analogous

#1F5B8B #1F258B #4F1F8B

triadic

#1F258B #8B1F25 #258B1F

tetradic

#1F258B #8B1F5B #8B851F #1F8B4F

square

#1F258B #8B1F5B #8B851F #1F8B4F

split-complementary

#1F258B #8B4F1F #5B8B1F

monochromatic

#090A27 #141859 #1F258B #2A32BD #4D55D7

Accessibility & contrast

On white

12.38

#1F258B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.70

#1F258B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F258B

12.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F258B	#FFFFFF	#000000	##FFFFFF
##1F258B	1.00	12.38	1.70	12.38
#FFFFFF	12.38	1.00	21.00	1.00
#000000	1.70	21.00	1.00	21.00
##FFFFFF	12.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003A8E

Deuteranopia (green-blind)

#002F89

Tritanopia (blue-blind)

#004255

Achromatopsia (no color)

#343434

Design tokens & code

CSS

--color: #1f258b;
/* rgb */ color: rgb(31, 37, 139);
/* oklch */ color: oklch(34.1% 0.165 271.2);

Tailwind

colors: {
  custom: {
    50: '#6e60ae',
    500: '#1f258b',
    950: '#000000',
  },
}

SCSS

$custom: #1f258b;
$custom-light: #6e60ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f258b",
  "rgb": {
    "r": 31,
    "g": 37,
    "b": 139
  },
  "hsl": {
    "h": 236.667,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.34082,
    "c": 0.16454,
    "h": 271.2
  },
  "luminance": 0.03479
}

Semantic roles & 50–950 ramp

primary

#1F258B

secondary

#BAB44C

accent

#DD41E7

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080510

muted

#7B797F

Preview Lab

Preview with #1F258B

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

Preview Lab → · Contrast checker → · Palette generator →