#1F578B#1F578B

#1F578B is a dark, moderate cyan. Relative luminance 0.090; OKLCH L 44.7% C 0.103 H 250.0°. Best body text is #FFFFFF at 7.52:1 contrast (WCAG AA passes).

Color values

HEX	#1F578B
RGB	rgb(31, 87, 139)
HSL	hsl(209, 64%, 33%)
HSV	hsv(209, 78%, 55%)
CMYK	cmyk(77.7%, 37.4%, 0%, 45.5%)
CIE-LAB	lab(35.93, 0.92, -34.07)
CIE-LCH	lch(35.93, 34.08, 271.54°)
OKLab	oklab(44.72% -0.0354 -0.097)
OKLCH	oklch(44.72% 0.103 250)
XYZ	xyz(8.6317, 8.9708, 25.6977)
Luminance	0.0897 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F578B #8B531F

analogous

#1F8B89 #1F578B #1F218B

triadic

#1F578B #8B1F57 #578B1F

tetradic

#1F578B #891F8B #8B531F #218B1F

square

#1F578B #891F8B #8B531F #218B1F

split-complementary

#1F578B #8B1F21 #8B891F

monochromatic

#091827 #143859 #1F578B #2A76BD #4D95D7

Accessibility & contrast

On white

7.52

#1F578B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.79

#1F578B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F578B

7.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F578B	#FFFFFF	#000000	##FFFFFF
##1F578B	1.00	7.52	2.79	7.52
#FFFFFF	7.52	1.00	21.00	1.00
#000000	2.79	21.00	1.00	21.00
##FFFFFF	7.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3F5A8D

Deuteranopia (green-blind)

#2F508A

Tritanopia (blue-blind)

#00636A

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #1f578b;
/* rgb */ color: rgb(31, 87, 139);
/* oklch */ color: oklch(44.7% 0.103 250.0);

Tailwind

colors: {
  custom: {
    50: '#6b86ad',
    500: '#1f578b',
    950: '#000000',
  },
}

SCSS

$custom: #1f578b;
$custom-light: #6b86ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f578b",
  "rgb": {
    "r": 31,
    "g": 87,
    "b": 139
  },
  "hsl": {
    "h": 208.889,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.44717,
    "c": 0.10324,
    "h": 250
  },
  "luminance": 0.08972
}

Semantic roles & 50–950 ramp

primary

#1F578B

secondary

#BA814C

accent

#9141E7

background

#F6F8FA

surface

#ECEFF4

border

#C7CACE

text

#080B10

muted

#7A7C7F

Preview Lab

Preview with #1F578B

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

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