#1B3F63#1B3F63

#1B3F63 is a dark, moderate cyan. Relative luminance 0.047; OKLCH L 36.0% C 0.075 H 250.7°. Best body text is #FFFFFF at 10.84:1 contrast (WCAG AA passes).

Color values

HEX	#1B3F63
RGB	rgb(27, 63, 99)
HSL	hsl(210, 57%, 25%)
HSV	hsv(210, 73%, 39%)
CMYK	cmyk(72.7%, 36.4%, 0%, 61.2%)
CIE-LAB	lab(25.83, 0.33, -25.01)
CIE-LCH	lch(25.83, 25.01, 270.76°)
OKLab	oklab(36.02% -0.0248 -0.0709)
OKLCH	oklch(36.02% 0.075 250.7)
XYZ	xyz(4.4808, 4.6884, 12.4708)
Luminance	0.0469 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3F63 #633F1B

analogous

#1B6363 #1B3F63 #1B1B63

triadic

#1B3F63 #631B3F #3F631B

tetradic

#1B3F63 #631B63 #633F1B #1B631B

square

#1B3F63 #631B63 #633F1B #1B631B

split-complementary

#1B3F63 #631B1B #63631B

monochromatic

#070F18 #0E2033 #1B3F63 #285E93 #357CC3

Accessibility & contrast

On white

10.84

#1B3F63 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#1B3F63 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3F63

10.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3F63	#FFFFFF	#000000	##FFFFFF
##1B3F63	1.00	10.84	1.94	10.84
#FFFFFF	10.84	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F4165

Deuteranopia (green-blind)

#253A62

Tritanopia (blue-blind)

#00474C

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #1b3f63;
/* rgb */ color: rgb(27, 63, 99);
/* oklch */ color: oklch(36.0% 0.075 250.7);

Tailwind

colors: {
  custom: {
    50: '#61738f',
    500: '#1b3f63',
    950: '#000000',
  },
}

SCSS

$custom: #1b3f63;
$custom-light: #61738f;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3f63",
  "rgb": {
    "r": 27,
    "g": 63,
    "b": 99
  },
  "hsl": {
    "h": 210,
    "s": 57.143,
    "l": 24.706
  },
  "oklch": {
    "l": 0.36016,
    "c": 0.07517,
    "h": 250.7
  },
  "luminance": 0.04689
}

Semantic roles & 50–950 ramp

primary

#1B3F63

secondary

#986D41

accent

#9447E0

background

#F6F6F8

surface

#EBECF0

border

#C6C7CB

text

#05080C

muted

#7A7B7D

Preview Lab

Preview with #1B3F63

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

Preview Lab → · Contrast checker → · Palette generator →