#1F356B#1F356B

#1F356B is a dark, moderate blue. Relative luminance 0.039; OKLCH L 34.3% C 0.098 H 265.0°. Best body text is #FFFFFF at 11.80:1 contrast (WCAG AA passes).

Color values

HEX	#1F356B
RGB	rgb(31, 53, 107)
HSL	hsl(223, 55%, 27%)
HSV	hsv(223, 71%, 42%)
CMYK	cmyk(71%, 50.5%, 0%, 58%)
CIE-LAB	lab(23.33, 11.22, -34.14)
CIE-LCH	lch(23.33, 35.93, 288.20°)
OKLab	oklab(34.3% -0.0086 -0.0978)
OKLCH	oklch(34.3% 0.098 265)
XYZ	xyz(4.4911, 3.8986, 14.4229)
Luminance	0.0390 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F356B #6B551F

analogous

#1F5B6B #1F356B #2F1F6B

triadic

#1F356B #6B1F35 #356B1F

tetradic

#1F356B #6B1F5B #6B551F #1F6B2F

square

#1F356B #6B1F5B #6B551F #1F6B2F

split-complementary

#1F356B #6B2F1F #5B6B1F

monochromatic

#070C18 #111D3C #1F356B #2D4D9A #3D65C7

Accessibility & contrast

On white

11.80

#1F356B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.78

#1F356B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F356B

11.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F356B	#FFFFFF	#000000	##FFFFFF
##1F356B	1.00	11.80	1.78	11.80
#FFFFFF	11.80	1.00	21.00	1.00
#000000	1.78	21.00	1.00	21.00
##FFFFFF	11.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#193B6D

Deuteranopia (green-blind)

#07346A

Tritanopia (blue-blind)

#00424A

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1f356b;
/* rgb */ color: rgb(31, 53, 107);
/* oklch */ color: oklch(34.3% 0.098 265.0);

Tailwind

colors: {
  custom: {
    50: '#646b96',
    500: '#1f356b',
    950: '#000000',
  },
}

SCSS

$custom: #1f356b;
$custom-light: #646b96;
$custom-dark: #000000;

JSON

{
  "hex": "#1f356b",
  "rgb": {
    "r": 31,
    "g": 53,
    "b": 107
  },
  "hsl": {
    "h": 222.632,
    "s": 55.072,
    "l": 27.059
  },
  "oklch": {
    "l": 0.34299,
    "c": 0.09816,
    "h": 265
  },
  "luminance": 0.03899
}

Semantic roles & 50–950 ramp

primary

#1F356B

secondary

#9F8647

accent

#B349DE

background

#F6F6F9

surface

#EBEBF2

border

#C6C6CC

text

#06060D

muted

#7A7A7E

Preview Lab

Preview with #1F356B

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

Preview Lab → · Contrast checker → · Palette generator →