#1B357B#1B357B

#1B357B is a dark, vivid blue. Relative luminance 0.042; OKLCH L 35.4% C 0.124 H 265.2°. Best body text is #FFFFFF at 11.40:1 contrast (WCAG AA passes).

Color values

HEX	#1B357B
RGB	rgb(27, 53, 123)
HSL	hsl(224, 64%, 29%)
HSV	hsv(224, 78%, 48%)
CMYK	cmyk(78%, 56.9%, 0%, 51.8%)
CIE-LAB	lab(24.35, 17.09, -42.72)
CIE-LCH	lch(24.35, 46.01, 291.80°)
OKLab	oklab(35.4% -0.0104 -0.1231)
OKLCH	oklch(35.4% 0.124 265.2)
XYZ	xyz(5.2990, 4.2087, 19.2681)
Luminance	0.0421 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B357B #7B611B

analogous

#1B657B #1B357B #311B7B

triadic

#1B357B #7B1B35 #357B1B

tetradic

#1B357B #7B1B65 #7B611B #1B7B31

square

#1B357B #7B1B65 #7B611B #1B7B31

split-complementary

#1B357B #7B311B #657B1B

monochromatic

#060B19 #101F49 #1B357B #264BAD #3C65D4

Accessibility & contrast

On white

11.40

#1B357B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#1B357B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B357B

11.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B357B	#FFFFFF	#000000	##FFFFFF
##1B357B	1.00	11.40	1.84	11.40
#FFFFFF	11.40	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003E7D

Deuteranopia (green-blind)

#00367A

Tritanopia (blue-blind)

#004652

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1b357b;
/* rgb */ color: rgb(27, 53, 123);
/* oklch */ color: oklch(35.4% 0.124 265.2);

Tailwind

colors: {
  custom: {
    50: '#676ba2',
    500: '#1b357b',
    950: '#000000',
  },
}

SCSS

$custom: #1b357b;
$custom-light: #676ba2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b357b",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 123
  },
  "hsl": {
    "h": 223.75,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.35403,
    "c": 0.12356,
    "h": 265.2
  },
  "luminance": 0.04209
}

Semantic roles & 50–950 ramp

primary

#1B357B

secondary

#AF9243

accent

#BA41E7

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07060F

muted

#7A7A7F

Preview Lab

Preview with #1B357B

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

Preview Lab → · Contrast checker → · Palette generator →