#1B257F#1B257F

#1B257F is a dark, vivid blue. Relative luminance 0.031; OKLCH L 32.6% C 0.150 H 270.2°. Best body text is #FFFFFF at 12.98:1 contrast (WCAG AA passes).

Color values

HEX	#1B257F
RGB	rgb(27, 37, 127)
HSL	hsl(234, 65%, 30%)
HSV	hsv(234, 79%, 50%)
CMYK	cmyk(78.7%, 70.9%, 0%, 50.2%)
CIE-LAB	lab(20.39, 29.77, -51.72)
CIE-LCH	lch(20.39, 59.67, 299.93°)
OKLab	oklab(32.58% 0.0006 -0.1497)
OKLCH	oklch(32.58% 0.15 270.2)
XYZ	xyz(4.9430, 3.0879, 20.4101)
Luminance	0.0309 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B257F #7F751B

analogous

#1B577F #1B257F #431B7F

triadic

#1B257F #7F1B25 #257F1B

tetradic

#1B257F #7F1B57 #7F751B #1B7F43

square

#1B257F #7F1B57 #7F751B #1B7F43

split-complementary

#1B257F #7F431B #577F1B

monochromatic

#06081A #10164D #1B257F #2634B1 #3E4ED6

Accessibility & contrast

On white

12.98

#1B257F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.62

#1B257F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B257F

12.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B257F	#FFFFFF	#000000	##FFFFFF
##1B257F	1.00	12.98	1.62	12.98
#FFFFFF	12.98	1.00	21.00	1.00
#000000	1.62	21.00	1.00	21.00
##FFFFFF	12.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003682

Deuteranopia (green-blind)

#002C7D

Tritanopia (blue-blind)

#003E4F

Achromatopsia (no color)

#313131

Design tokens & code

CSS

--color: #1b257f;
/* rgb */ color: rgb(27, 37, 127);
/* oklch */ color: oklch(32.6% 0.150 270.2);

Tailwind

colors: {
  custom: {
    50: '#6960a5',
    500: '#1b257f',
    950: '#000000',
  },
}

SCSS

$custom: #1b257f;
$custom-light: #6960a5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b257f",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 127
  },
  "hsl": {
    "h": 234,
    "s": 64.935,
    "l": 30.196
  },
  "oklch": {
    "l": 0.32584,
    "c": 0.14968,
    "h": 270.2
  },
  "luminance": 0.03088
}

Semantic roles & 50–950 ramp

primary

#1B257F

secondary

#B3A843

accent

#D740E8

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B257F

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

Preview Lab → · Contrast checker → · Palette generator →