#1F238B#1F238B

#1F238B is a dark, vivid blue. Relative luminance 0.034; OKLCH L 33.8% C 0.167 H 271.5°. Best body text is #FFFFFF at 12.56:1 contrast (WCAG AA passes).

Color values

HEX	#1F238B
RGB	rgb(31, 35, 139)
HSL	hsl(238, 64%, 33%)
HSV	hsv(238, 78%, 55%)
CMYK	cmyk(77.7%, 74.8%, 0%, 45.5%)
CIE-LAB	lab(21.42, 35.84, -57.56)
CIE-LCH	lch(21.42, 67.81, 301.91°)
OKLab	oklab(33.76% 0.0045 -0.1666)
OKLCH	oklch(33.76% 0.167 271.5)
XYZ	xyz(5.8247, 3.3568, 24.7620)
Luminance	0.0336 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F238B #8B871F

analogous

#1F598B #1F238B #511F8B

triadic

#1F238B #8B1F23 #238B1F

tetradic

#1F238B #8B1F59 #8B871F #1F8B51

square

#1F238B #8B1F59 #8B871F #1F8B51

split-complementary

#1F238B #8B511F #598B1F

monochromatic

#090A27 #141659 #1F238B #2A30BD #4D52D7

Accessibility & contrast

On white

12.56

#1F238B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.67

#1F238B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F238B

12.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F238B	#FFFFFF	#000000	##FFFFFF
##1F238B	1.00	12.56	1.67	12.56
#FFFFFF	12.56	1.00	21.00	1.00
#000000	1.67	21.00	1.00	21.00
##FFFFFF	12.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00398E

Deuteranopia (green-blind)

#002E89

Tritanopia (blue-blind)

#004155

Achromatopsia (no color)

#333333

Design tokens & code

CSS

--color: #1f238b;
/* rgb */ color: rgb(31, 35, 139);
/* oklch */ color: oklch(33.8% 0.167 271.5);

Tailwind

colors: {
  custom: {
    50: '#6e5fae',
    500: '#1f238b',
    950: '#000000',
  },
}

SCSS

$custom: #1f238b;
$custom-light: #6e5fae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f238b",
  "rgb": {
    "r": 31,
    "g": 35,
    "b": 139
  },
  "hsl": {
    "h": 237.778,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.33764,
    "c": 0.16669,
    "h": 271.5
  },
  "luminance": 0.03357
}

Semantic roles & 50–950 ramp

primary

#1F238B

secondary

#BAB64C

accent

#E041E7

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #1F238B

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

Preview Lab → · Contrast checker → · Palette generator →