#1F228B#1F228B

#1F228B is a dark, vivid blue. Relative luminance 0.033; OKLCH L 33.6% C 0.168 H 271.7°. Best body text is #FFFFFF at 12.65:1 contrast (WCAG AA passes).

Color values

HEX	#1F228B
RGB	rgb(31, 34, 139)
HSL	hsl(238, 64%, 33%)
HSV	hsv(238, 78%, 55%)
CMYK	cmyk(77.7%, 75.5%, 0%, 45.5%)
CIE-LAB	lab(21.20, 36.44, -57.92)
CIE-LCH	lch(21.20, 68.43, 302.18°)
OKLab	oklab(33.61% 0.005 -0.1677)
OKLCH	oklch(33.61% 0.168 271.7)
XYZ	xyz(5.7957, 3.2988, 24.7524)
Luminance	0.0330 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F228B #8B881F

analogous

#1F588B #1F228B #521F8B

triadic

#1F228B #8B1F22 #228B1F

tetradic

#1F228B #8B1F58 #8B881F #1F8B52

square

#1F228B #8B1F58 #8B881F #1F8B52

split-complementary

#1F228B #8B521F #588B1F

monochromatic

#090A27 #141659 #1F228B #2A2EBD #4D51D7

Accessibility & contrast

On white

12.65

#1F228B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.66

#1F228B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F228B

12.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F228B	#FFFFFF	#000000	##FFFFFF
##1F228B	1.00	12.65	1.66	12.65
#FFFFFF	12.65	1.00	21.00	1.00
#000000	1.66	21.00	1.00	21.00
##FFFFFF	12.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00388E

Deuteranopia (green-blind)

#002E89

Tritanopia (blue-blind)

#004054

Achromatopsia (no color)

#333333

Design tokens & code

CSS

--color: #1f228b;
/* rgb */ color: rgb(31, 34, 139);
/* oklch */ color: oklch(33.6% 0.168 271.7);

Tailwind

colors: {
  custom: {
    50: '#6e5eae',
    500: '#1f228b',
    950: '#000000',
  },
}

SCSS

$custom: #1f228b;
$custom-light: #6e5eae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f228b",
  "rgb": {
    "r": 31,
    "g": 34,
    "b": 139
  },
  "hsl": {
    "h": 238.333,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.33609,
    "c": 0.16774,
    "h": 271.7
  },
  "luminance": 0.03299
}

Semantic roles & 50–950 ramp

primary

#1F228B

secondary

#BAB74C

accent

#E241E7

background

#F7F5FA

surface

#EDE9F4

border

#C8C5CE

text

#080410

muted

#7B797F

Preview Lab

Preview with #1F228B

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

Preview Lab → · Contrast checker → · Palette generator →