#1B257A#1B257A

#1B257A is a dark, vivid blue. Relative luminance 0.030; OKLCH L 32.1% C 0.143 H 270.4°. Best body text is #FFFFFF at 13.19:1 contrast (WCAG AA passes).

Color values

HEX	#1B257A
RGB	rgb(27, 37, 122)
HSL	hsl(234, 64%, 29%)
HSV	hsv(234, 78%, 48%)
CMYK	cmyk(77.9%, 69.7%, 0%, 52.2%)
CIE-LAB	lab(19.89, 27.86, -49.37)
CIE-LCH	lch(19.89, 56.69, 299.44°)
OKLab	oklab(32.06% 0.0011 -0.1428)
OKLCH	oklch(32.06% 0.143 270.4)
XYZ	xyz(4.6252, 2.9608, 18.7363)
Luminance	0.0296 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B257A #7A701B

analogous

#1B557A #1B257A #411B7A

triadic

#1B257A #7A1B25 #257A1B

tetradic

#1B257A #7A1B55 #7A701B #1B7A41

square

#1B257A #7A1B55 #7A701B #1B7A41

split-complementary

#1B257A #7A411B #557A1B

monochromatic

#060819 #101648 #1B257A #2634AC #3C4CD4

Accessibility & contrast

On white

13.19

#1B257A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.59

#1B257A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B257A

13.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B257A	#FFFFFF	#000000	##FFFFFF
##1B257A	1.00	13.19	1.59	13.19
#FFFFFF	13.19	1.00	21.00	1.00
#000000	1.59	21.00	1.00	21.00
##FFFFFF	13.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00357D

Deuteranopia (green-blind)

#002C78

Tritanopia (blue-blind)

#003C4C

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #1b257a;
/* rgb */ color: rgb(27, 37, 122);
/* oklch */ color: oklch(32.1% 0.143 270.4);

Tailwind

colors: {
  custom: {
    50: '#685fa1',
    500: '#1b257a',
    950: '#000000',
  },
}

SCSS

$custom: #1b257a;
$custom-light: #685fa1;
$custom-dark: #000000;

JSON

{
  "hex": "#1b257a",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 122
  },
  "hsl": {
    "h": 233.684,
    "s": 63.758,
    "l": 29.216
  },
  "oklch": {
    "l": 0.32063,
    "c": 0.14283,
    "h": 270.4
  },
  "luminance": 0.02961
}

Semantic roles & 50–950 ramp

primary

#1B257A

secondary

#AEA343

accent

#D541E7

background

#F6F5FA

surface

#ECE9F3

border

#C7C5CD

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B257A

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

Preview Lab → · Contrast checker → · Palette generator →