#1F358B#1F358B

#1F358B is a dark, vivid blue. Relative luminance 0.047; OKLCH L 37.0% C 0.145 H 267.6°. Best body text is #FFFFFF at 10.82:1 contrast (WCAG AA passes).

Color values

HEX	#1F358B
RGB	rgb(31, 53, 139)
HSL	hsl(228, 64%, 33%)
HSV	hsv(228, 78%, 55%)
CMYK	cmyk(77.7%, 61.9%, 0%, 45.5%)
CIE-LAB	lab(25.87, 23.98, -50.26)
CIE-LCH	lch(25.87, 55.69, 295.51°)
OKLab	oklab(37.01% -0.0062 -0.1452)
OKLCH	oklch(37.01% 0.145 267.6)
XYZ	xyz(6.4968, 4.7009, 24.9861)
Luminance	0.0470 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F358B #8B751F

analogous

#1F6B8B #1F358B #3F1F8B

triadic

#1F358B #8B1F35 #358B1F

tetradic

#1F358B #8B1F6B #8B751F #1F8B3F

square

#1F358B #8B1F6B #8B751F #1F8B3F

split-complementary

#1F358B #8B3F1F #6B8B1F

monochromatic

#090F27 #142259 #1F358B #2A48BD #4D69D7

Accessibility & contrast

On white

10.82

#1F358B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#1F358B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F358B

10.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F358B	#FFFFFF	#000000	##FFFFFF
##1F358B	1.00	10.82	1.94	10.82
#FFFFFF	10.82	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00428E

Deuteranopia (green-blind)

#003889

Tritanopia (blue-blind)

#004B5A

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1f358b;
/* rgb */ color: rgb(31, 53, 139);
/* oklch */ color: oklch(37.0% 0.145 267.6);

Tailwind

colors: {
  custom: {
    50: '#6c6cae',
    500: '#1f358b',
    950: '#000000',
  },
}

SCSS

$custom: #1f358b;
$custom-light: #6c6cae;
$custom-dark: #000000;

JSON

{
  "hex": "#1f358b",
  "rgb": {
    "r": 31,
    "g": 53,
    "b": 139
  },
  "hsl": {
    "h": 227.778,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.37006,
    "c": 0.14535,
    "h": 267.6
  },
  "luminance": 0.04702
}

Semantic roles & 50–950 ramp

primary

#1F358B

secondary

#BAA44C

accent

#C541E7

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080610

muted

#7B7A7F

Preview Lab

Preview with #1F358B

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

Preview Lab → · Contrast checker → · Palette generator →