#1B397B#1B397B

#1B397B is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.3% C 0.118 H 263.3°. Best body text is #FFFFFF at 10.95:1 contrast (WCAG AA passes).

Color values

HEX	#1B397B
RGB	rgb(27, 57, 123)
HSL	hsl(221, 64%, 29%)
HSV	hsv(221, 78%, 48%)
CMYK	cmyk(78%, 53.7%, 0%, 51.8%)
CIE-LAB	lab(25.53, 14.26, -40.81)
CIE-LCH	lch(25.53, 43.23, 289.26°)
OKLab	oklab(36.3% -0.0138 -0.1174)
OKLCH	oklch(36.3% 0.118 263.3)
XYZ	xyz(5.4890, 4.5887, 19.3315)
Luminance	0.0459 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B397B #7B5D1B

analogous

#1B697B #1B397B #2D1B7B

triadic

#1B397B #7B1B39 #397B1B

tetradic

#1B397B #7B1B69 #7B5D1B #1B7B2D

square

#1B397B #7B1B69 #7B5D1B #1B7B2D

split-complementary

#1B397B #7B2D1B #697B1B

monochromatic

#060C19 #102249 #1B397B #2650AD #3C6CD4

Accessibility & contrast

On white

10.95

#1B397B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#1B397B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B397B

10.95:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B397B	#FFFFFF	#000000	##FFFFFF
##1B397B	1.00	10.95	1.92	10.95
#FFFFFF	10.95	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.95	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D417D

Deuteranopia (green-blind)

#00387A

Tritanopia (blue-blind)

#004954

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #1b397b;
/* rgb */ color: rgb(27, 57, 123);
/* oklch */ color: oklch(36.3% 0.118 263.3);

Tailwind

colors: {
  custom: {
    50: '#676ea2',
    500: '#1b397b',
    950: '#000000',
  },
}

SCSS

$custom: #1b397b;
$custom-light: #676ea2;
$custom-dark: #000000;

JSON

{
  "hex": "#1b397b",
  "rgb": {
    "r": 27,
    "g": 57,
    "b": 123
  },
  "hsl": {
    "h": 221.25,
    "s": 64,
    "l": 29.412
  },
  "oklch": {
    "l": 0.36297,
    "c": 0.11823,
    "h": 263.3
  },
  "luminance": 0.04589
}

Semantic roles & 50–950 ramp

primary

#1B397B

secondary

#AF8D43

accent

#B341E7

background

#F6F6FA

surface

#EBEBF3

border

#C6C6CD

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #1B397B

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

Preview Lab → · Contrast checker → · Palette generator →