#1F558B#1F558B

#1F558B is a dark, moderate cyan. Relative luminance 0.087; OKLCH L 44.2% C 0.105 H 251.5°. Best body text is #FFFFFF at 7.69:1 contrast (WCAG AA passes).

Color values

HEX	#1F558B
RGB	rgb(31, 85, 139)
HSL	hsl(210, 64%, 33%)
HSV	hsv(210, 78%, 55%)
CMYK	cmyk(77.7%, 38.8%, 0%, 45.5%)
CIE-LAB	lab(35.30, 2.21, -35.06)
CIE-LCH	lch(35.30, 35.13, 273.61°)
OKLab	oklab(44.23% -0.0334 -0.0999)
OKLCH	oklch(44.23% 0.105 251.5)
XYZ	xyz(8.4720, 8.6514, 25.6445)
Luminance	0.0865 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F558B #8B551F

analogous

#1F8B8B #1F558B #1F1F8B

triadic

#1F558B #8B1F55 #558B1F

tetradic

#1F558B #8B1F8B #8B551F #1F8B1F

square

#1F558B #8B1F8B #8B551F #1F8B1F

split-complementary

#1F558B #8B1F1F #8B8B1F

monochromatic

#091827 #143659 #1F558B #2A74BD #4D92D7

Accessibility & contrast

On white

7.69

#1F558B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.73

#1F558B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F558B

7.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F558B	#FFFFFF	#000000	##FFFFFF
##1F558B	1.00	7.69	2.73	7.69
#FFFFFF	7.69	1.00	21.00	1.00
#000000	2.73	21.00	1.00	21.00
##FFFFFF	7.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3C588D

Deuteranopia (green-blind)

#2B4E8A

Tritanopia (blue-blind)

#006269

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #1f558b;
/* rgb */ color: rgb(31, 85, 139);
/* oklch */ color: oklch(44.2% 0.105 251.5);

Tailwind

colors: {
  custom: {
    50: '#6b84ad',
    500: '#1f558b',
    950: '#000000',
  },
}

SCSS

$custom: #1f558b;
$custom-light: #6b84ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f558b",
  "rgb": {
    "r": 31,
    "g": 85,
    "b": 139
  },
  "hsl": {
    "h": 210,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.44229,
    "c": 0.10538,
    "h": 251.5
  },
  "luminance": 0.08652
}

Semantic roles & 50–950 ramp

primary

#1F558B

secondary

#BA834C

accent

#9441E7

background

#F6F8FA

surface

#ECEFF4

border

#C7CACE

text

#080A10

muted

#7A7C7F

Preview Lab

Preview with #1F558B

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

Preview Lab → · Contrast checker → · Palette generator →