#1F258F#1F258F

#1F258F is a dark, vivid blue. Relative luminance 0.036; OKLCH L 34.5% C 0.170 H 271.0°. Best body text is #FFFFFF at 12.21:1 contrast (WCAG AA passes).

Color values

HEX	#1F258F
RGB	rgb(31, 37, 143)
HSL	hsl(237, 64%, 34%)
HSV	hsv(237, 78%, 56%)
CMYK	cmyk(78.3%, 74.1%, 0%, 43.9%)
CIE-LAB	lab(22.29, 36.04, -58.61)
CIE-LCH	lch(22.29, 68.81, 301.59°)
OKLab	oklab(34.52% 0.0029 -0.1697)
OKLCH	oklch(34.52% 0.17 271)
XYZ	xyz(6.1829, 3.5969, 26.3497)
Luminance	0.0360 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F258F #8F891F

analogous

#1F5D8F #1F258F #511F8F

triadic

#1F258F #8F1F25 #258F1F

tetradic

#1F258F #8F1F5D #8F891F #1F8F51

square

#1F258F #8F1F5D #8F891F #1F8F51

split-complementary

#1F258F #8F511F #5D8F1F

monochromatic

#090B2A #14185D #1F258F #2A32C1 #4F57D9

Accessibility & contrast

On white

12.21

#1F258F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#1F258F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F258F

12.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F258F	#FFFFFF	#000000	##FFFFFF
##1F258F	1.00	12.21	1.72	12.21
#FFFFFF	12.21	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003B92

Deuteranopia (green-blind)

#00308D

Tritanopia (blue-blind)

#004357

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #1f258f;
/* rgb */ color: rgb(31, 37, 143);
/* oklch */ color: oklch(34.5% 0.170 271.0);

Tailwind

colors: {
  custom: {
    50: '#6f60b1',
    500: '#1f258f',
    950: '#000000',
  },
}

SCSS

$custom: #1f258f;
$custom-light: #6f60b1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f258f",
  "rgb": {
    "r": 31,
    "g": 37,
    "b": 143
  },
  "hsl": {
    "h": 236.786,
    "s": 64.368,
    "l": 34.118
  },
  "oklch": {
    "l": 0.34515,
    "c": 0.16973,
    "h": 271
  },
  "luminance": 0.03598
}

Semantic roles & 50–950 ramp

primary

#1F258F

secondary

#BCB64E

accent

#DE40E7

background

#F7F5FB

surface

#EDE9F6

border

#C8C5D0

text

#090511

muted

#7B7980

Preview Lab

Preview with #1F258F

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

Preview Lab → · Contrast checker → · Palette generator →