#1F308B#1F308B

#1F308B is a dark, vivid blue. Relative luminance 0.043; OKLCH L 36.0% C 0.152 H 268.9°. Best body text is #FFFFFF at 11.33:1 contrast (WCAG AA passes).

Color values

HEX	#1F308B
RGB	rgb(31, 48, 139)
HSL	hsl(231, 64%, 33%)
HSV	hsv(231, 78%, 55%)
CMYK	cmyk(77.7%, 65.5%, 0%, 45.5%)
CIE-LAB	lab(24.54, 27.40, -52.43)
CIE-LCH	lch(24.54, 59.16, 297.59°)
OKLab	oklab(36.03% -0.0028 -0.1516)
OKLCH	oklch(36.03% 0.152 268.9)
XYZ	xyz(6.2806, 4.2686, 24.9140)
Luminance	0.0427 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F308B #8B7A1F

analogous

#1F668B #1F308B #441F8B

triadic

#1F308B #8B1F30 #308B1F

tetradic

#1F308B #8B1F66 #8B7A1F #1F8B44

square

#1F308B #8B1F66 #8B7A1F #1F8B44

split-complementary

#1F308B #8B441F #668B1F

monochromatic

#090D27 #141F59 #1F308B #2A41BD #4D63D7

Accessibility & contrast

On white

11.33

#1F308B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.85

#1F308B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F308B

11.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F308B	#FFFFFF	#000000	##FFFFFF
##1F308B	1.00	11.33	1.85	11.33
#FFFFFF	11.33	1.00	21.00	1.00
#000000	1.85	21.00	1.00	21.00
##FFFFFF	11.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003F8E

Deuteranopia (green-blind)

#003589

Tritanopia (blue-blind)

#004859

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f308b;
/* rgb */ color: rgb(31, 48, 139);
/* oklch */ color: oklch(36.0% 0.152 268.9);

Tailwind

colors: {
  custom: {
    50: '#6d68ae',
    500: '#1f308b',
    950: '#000000',
  },
}

SCSS

$custom: #1f308b;
$custom-light: #6d68ae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f308b",
  "rgb": {
    "r": 31,
    "g": 48,
    "b": 139
  },
  "hsl": {
    "h": 230.556,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.36026,
    "c": 0.15165,
    "h": 268.9
  },
  "luminance": 0.04269
}

Semantic roles & 50–950 ramp

primary

#1F308B

secondary

#BAA94C

accent

#CD41E7

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1F308B

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

Preview Lab → · Contrast checker → · Palette generator →