#1F355B#1F355B

#1F355B is a dark, moderate blue. Relative luminance 0.036; OKLCH L 33.1% C 0.073 H 260.7°. Best body text is #FFFFFF at 12.22:1 contrast (WCAG AA passes).

Color values

HEX	#1F355B
RGB	rgb(31, 53, 91)
HSL	hsl(218, 49%, 24%)
HSV	hsv(218, 66%, 36%)
CMYK	cmyk(65.9%, 41.8%, 0%, 64.3%)
CIE-LAB	lab(22.28, 4.87, -25.41)
CIE-LCH	lch(22.28, 25.87, 280.85°)
OKLab	oklab(33.14% -0.0119 -0.0722)
OKLCH	oklch(33.14% 0.073 260.7)
XYZ	xyz(3.7258, 3.5925, 10.3926)
Luminance	0.0359 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F355B #5B451F

analogous

#1F535B #1F355B #271F5B

triadic

#1F355B #5B1F35 #355B1F

tetradic

#1F355B #5B1F53 #5B451F #1F5B27

square

#1F355B #5B1F53 #5B451F #1F5B27

split-complementary

#1F355B #5B271F #535B1F

monochromatic

#080D17 #0F1A2D #1F355B #2F5089 #3E6AB6

Accessibility & contrast

On white

12.22

#1F355B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#1F355B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F355B

12.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F355B	#FFFFFF	#000000	##FFFFFF
##1F355B	1.00	12.22	1.72	12.22
#FFFFFF	12.22	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#25385D

Deuteranopia (green-blind)

#1C335A

Tritanopia (blue-blind)

#003E43

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #1f355b;
/* rgb */ color: rgb(31, 53, 91);
/* oklch */ color: oklch(33.1% 0.073 260.7);

Tailwind

colors: {
  custom: {
    50: '#616b89',
    500: '#1f355b',
    950: '#000000',
  },
}

SCSS

$custom: #1f355b;
$custom-light: #616b89;
$custom-dark: #000000;

JSON

{
  "hex": "#1f355b",
  "rgb": {
    "r": 31,
    "g": 53,
    "b": 91
  },
  "hsl": {
    "h": 218,
    "s": 49.18,
    "l": 23.922
  },
  "oklch": {
    "l": 0.33143,
    "c": 0.07314,
    "h": 260.7
  },
  "luminance": 0.03593
}

Semantic roles & 50–950 ramp

primary

#1F355B

secondary

#907546

accent

#A64FD9

background

#F5F6F8

surface

#EAEBF0

border

#C6C6CB

text

#05060B

muted

#797A7C

Preview Lab

Preview with #1F355B

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

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