#1F338B#1F338B

#1F338B is a dark, vivid blue. Relative luminance 0.045; OKLCH L 36.6% C 0.148 H 268.1°. Best body text is #FFFFFF at 11.03:1 contrast (WCAG AA passes).

Color values

HEX	#1F338B
RGB	rgb(31, 51, 139)
HSL	hsl(229, 64%, 33%)
HSV	hsv(229, 78%, 55%)
CMYK	cmyk(77.7%, 63.3%, 0%, 45.5%)
CIE-LAB	lab(25.33, 25.36, -51.14)
CIE-LCH	lch(25.33, 57.08, 296.37°)
OKLab	oklab(36.61% -0.0048 -0.1478)
OKLCH	oklch(36.61% 0.148 268.1)
XYZ	xyz(6.4075, 4.5223, 24.9563)
Luminance	0.0452 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F338B #8B771F

analogous

#1F698B #1F338B #411F8B

triadic

#1F338B #8B1F33 #338B1F

tetradic

#1F338B #8B1F69 #8B771F #1F8B41

square

#1F338B #8B1F69 #8B771F #1F8B41

split-complementary

#1F338B #8B411F #698B1F

monochromatic

#090E27 #142159 #1F338B #2A45BD #4D67D7

Accessibility & contrast

On white

11.03

#1F338B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#1F338B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F338B

11.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F338B	#FFFFFF	#000000	##FFFFFF
##1F338B	1.00	11.03	1.90	11.03
#FFFFFF	11.03	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00418E

Deuteranopia (green-blind)

#003789

Tritanopia (blue-blind)

#004A5A

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1f338b;
/* rgb */ color: rgb(31, 51, 139);
/* oklch */ color: oklch(36.6% 0.148 268.1);

Tailwind

colors: {
  custom: {
    50: '#6d6aae',
    500: '#1f338b',
    950: '#000000',
  },
}

SCSS

$custom: #1f338b;
$custom-light: #6d6aae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f338b",
  "rgb": {
    "r": 31,
    "g": 51,
    "b": 139
  },
  "hsl": {
    "h": 228.889,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.36608,
    "c": 0.14789,
    "h": 268.1
  },
  "luminance": 0.04523
}

Semantic roles & 50–950 ramp

primary

#1F338B

secondary

#BAA64C

accent

#C841E7

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1F338B

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

Preview Lab → · Contrast checker → · Palette generator →