#1B2B59#1B2B59

#1B2B59 is a dark, moderate blue. Relative luminance 0.027; OKLCH L 30.3% C 0.085 H 266.8°. Best body text is #FFFFFF at 13.67:1 contrast (WCAG AA passes).

Color values

HEX	#1B2B59
RGB	rgb(27, 43, 89)
HSL	hsl(225, 53%, 23%)
HSV	hsv(225, 70%, 35%)
CMYK	cmyk(69.7%, 51.7%, 0%, 65.1%)
CIE-LAB	lab(18.72, 10.41, -29.77)
CIE-LCH	lch(18.72, 31.54, 289.27°)
OKLab	oklab(30.3% -0.0047 -0.0852)
OKLCH	oklch(30.3% 0.085 266.8)
XYZ	xyz(3.1184, 2.6817, 9.8025)
Luminance	0.0268 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B2B59 #59491B

analogous

#1B4A59 #1B2B59 #2A1B59

triadic

#1B2B59 #591B2B #2B591B

tetradic

#1B2B59 #591B4A #59491B #1B592A

square

#1B2B59 #591B4A #59491B #1B592A

split-complementary

#1B2B59 #592A1B #4A591B

monochromatic

#070B17 #0D142A #1B2B59 #294288 #3758B7

Accessibility & contrast

On white

13.67

#1B2B59 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.54

#1B2B59 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B2B59

13.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B2B59	#FFFFFF	#000000	##FFFFFF
##1B2B59	1.00	13.67	1.54	13.67
#FFFFFF	13.67	1.00	21.00	1.00
#000000	1.54	21.00	1.00	21.00
##FFFFFF	13.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#13315B

Deuteranopia (green-blind)

#072B58

Tritanopia (blue-blind)

#00363D

Achromatopsia (no color)

#2E2E2E

Design tokens & code

CSS

--color: #1b2b59;
/* rgb */ color: rgb(27, 43, 89);
/* oklch */ color: oklch(30.3% 0.085 266.8);

Tailwind

colors: {
  custom: {
    50: '#5f6388',
    500: '#1b2b59',
    950: '#000000',
  },
}

SCSS

$custom: #1b2b59;
$custom-light: #5f6388;
$custom-dark: #000000;

JSON

{
  "hex": "#1b2b59",
  "rgb": {
    "r": 27,
    "g": 43,
    "b": 89
  },
  "hsl": {
    "h": 224.516,
    "s": 53.448,
    "l": 22.745
  },
  "oklch": {
    "l": 0.30303,
    "c": 0.08535,
    "h": 266.8
  },
  "luminance": 0.02682
}

Semantic roles & 50–950 ramp

primary

#1B2B59

secondary

#8F7B41

accent

#B74BDD

background

#F5F5F8

surface

#EAEAF0

border

#C6C6CB

text

#05050B

muted

#79797C

Preview Lab

Preview with #1B2B59

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

Preview Lab → · Contrast checker → · Palette generator →