#1F588B#1F588B

#1F588B is a dark, moderate cyan. Relative luminance 0.091; OKLCH L 45.0% C 0.102 H 249.2°. Best body text is #FFFFFF at 7.43:1 contrast (WCAG AA passes).

Color values

HEX	#1F588B
RGB	rgb(31, 88, 139)
HSL	hsl(208, 64%, 33%)
HSV	hsv(208, 78%, 55%)
CMYK	cmyk(77.7%, 36.7%, 0%, 45.5%)
CIE-LAB	lab(36.24, 0.27, -33.57)
CIE-LCH	lch(36.24, 33.57, 270.47°)
OKLab	oklab(44.96% -0.0363 -0.0955)
OKLCH	oklch(44.96% 0.102 249.2)
XYZ	xyz(8.7132, 9.1338, 25.7249)
Luminance	0.0914 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F588B #8B521F

analogous

#1F8B88 #1F588B #1F228B

triadic

#1F588B #8B1F58 #588B1F

tetradic

#1F588B #881F8B #8B521F #228B1F

square

#1F588B #881F8B #8B521F #228B1F

split-complementary

#1F588B #8B1F22 #8B881F

monochromatic

#091927 #143859 #1F588B #2A78BD #4D96D7

Accessibility & contrast

On white

7.43

#1F588B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.83

#1F588B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F588B

7.43:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F588B	#FFFFFF	#000000	##FFFFFF
##1F588B	1.00	7.43	2.83	7.43
#FFFFFF	7.43	1.00	21.00	1.00
#000000	2.83	21.00	1.00	21.00
##FFFFFF	7.43	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#405B8D

Deuteranopia (green-blind)

#31518A

Tritanopia (blue-blind)

#00646B

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1f588b;
/* rgb */ color: rgb(31, 88, 139);
/* oklch */ color: oklch(45.0% 0.102 249.2);

Tailwind

colors: {
  custom: {
    50: '#6b86ad',
    500: '#1f588b',
    950: '#000000',
  },
}

SCSS

$custom: #1f588b;
$custom-light: #6b86ad;
$custom-dark: #000000;

JSON

{
  "hex": "#1f588b",
  "rgb": {
    "r": 31,
    "g": 88,
    "b": 139
  },
  "hsl": {
    "h": 208.333,
    "s": 63.529,
    "l": 33.333
  },
  "oklch": {
    "l": 0.44963,
    "c": 0.10221,
    "h": 249.2
  },
  "luminance": 0.09135
}

Semantic roles & 50–950 ramp

primary

#1F588B

secondary

#BA804C

accent

#8F41E7

background

#F6F8FA

surface

#ECEFF4

border

#C7CACE

text

#080B10

muted

#7A7C7F

Preview Lab

Preview with #1F588B

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

Preview Lab → · Contrast checker → · Palette generator →