#1F577B#1F577B

#1F577B is a dark, moderate cyan. Relative luminance 0.085; OKLCH L 43.8% C 0.083 H 240.8°. Best body text is #FFFFFF at 7.76:1 contrast (WCAG AA passes).

Color values

HEX	#1F577B
RGB	rgb(31, 87, 123)
HSL	hsl(203, 60%, 30%)
HSV	hsv(203, 75%, 48%)
CMYK	cmyk(74.8%, 29.3%, 0%, 51.8%)
CIE-LAB	lab(35.08, -5.25, -25.60)
CIE-LCH	lch(35.08, 26.13, 258.40°)
OKLab	oklab(43.77% -0.0404 -0.0723)
OKLCH	oklch(43.77% 0.083 240.8)
XYZ	xyz(7.5470, 8.5369, 19.9851)
Luminance	0.0854 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F577B #7B431F

analogous

#1F7B71 #1F577B #1F297B

triadic

#1F577B #7B1F57 #577B1F

tetradic

#1F577B #711F7B #7B431F #297B1F

square

#1F577B #711F7B #7B431F #297B1F

split-complementary

#1F577B #7B1F29 #7B711F

monochromatic

#061219 #13344A #1F577B #2B7AAC #4499D0

Accessibility & contrast

On white

7.76

#1F577B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.71

#1F577B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F577B

7.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F577B	#FFFFFF	#000000	##FFFFFF
##1F577B	1.00	7.76	2.71	7.76
#FFFFFF	7.76	1.00	21.00	1.00
#000000	2.71	21.00	1.00	21.00
##FFFFFF	7.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#46577D

Deuteranopia (green-blind)

#3A4F7A

Tritanopia (blue-blind)

#006064

Achromatopsia (no color)

#525252

Design tokens & code

CSS

--color: #1f577b;
/* rgb */ color: rgb(31, 87, 123);
/* oklch */ color: oklch(43.8% 0.083 240.8);

Tailwind

colors: {
  custom: {
    50: '#6886a1',
    500: '#1f577b',
    950: '#000000',
  },
}

SCSS

$custom: #1f577b;
$custom-light: #6886a1;
$custom-dark: #000000;

JSON

{
  "hex": "#1f577b",
  "rgb": {
    "r": 31,
    "g": 87,
    "b": 123
  },
  "hsl": {
    "h": 203.478,
    "s": 59.74,
    "l": 30.196
  },
  "oklch": {
    "l": 0.43768,
    "c": 0.08282,
    "h": 240.8
  },
  "luminance": 0.08538
}

Semantic roles & 50–950 ramp

primary

#1F577B

secondary

#AE7048

accent

#8345E3

background

#F6F8F9

surface

#EBEFF2

border

#C6CACC

text

#070B0F

muted

#7A7C7E

Preview Lab

Preview with #1F577B

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

Preview Lab → · Contrast checker → · Palette generator →