#1B257D#1B257D

#1B257D is a dark, vivid blue. Relative luminance 0.030; OKLCH L 32.4% C 0.147 H 270.3°. Best body text is #FFFFFF at 13.06:1 contrast (WCAG AA passes).

Color values

HEX	#1B257D
RGB	rgb(27, 37, 125)
HSL	hsl(234, 64%, 30%)
HSV	hsv(234, 78%, 49%)
CMYK	cmyk(78.4%, 70.4%, 0%, 51%)
CIE-LAB	lab(20.19, 29.01, -50.78)
CIE-LCH	lch(20.19, 58.48, 299.74°)
OKLab	oklab(32.38% 0.0008 -0.147)
OKLCH	oklch(32.38% 0.147 270.3)
XYZ	xyz(4.8140, 3.0363, 19.7304)
Luminance	0.0304 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B257D #7D731B

analogous

#1B567D #1B257D #421B7D

triadic

#1B257D #7D1B25 #257D1B

tetradic

#1B257D #7D1B56 #7D731B #1B7D42

square

#1B257D #7D1B56 #7D731B #1B7D42

split-complementary

#1B257D #7D421B #567D1B

monochromatic

#050719 #10164B #1B257D #2634AF #3D4DD5

Accessibility & contrast

On white

13.06

#1B257D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.61

#1B257D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B257D

13.06:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B257D	#FFFFFF	#000000	##FFFFFF
##1B257D	1.00	13.06	1.61	13.06
#FFFFFF	13.06	1.00	21.00	1.00
#000000	1.61	21.00	1.00	21.00
##FFFFFF	13.06	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003580

Deuteranopia (green-blind)

#002C7B

Tritanopia (blue-blind)

#003D4D

Achromatopsia (no color)

#313131

Design tokens & code

CSS

--color: #1b257d;
/* rgb */ color: rgb(27, 37, 125);
/* oklch */ color: oklch(32.4% 0.147 270.3);

Tailwind

colors: {
  custom: {
    50: '#695fa4',
    500: '#1b257d',
    950: '#000000',
  },
}

SCSS

$custom: #1b257d;
$custom-light: #695fa4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b257d",
  "rgb": {
    "r": 27,
    "g": 37,
    "b": 125
  },
  "hsl": {
    "h": 233.878,
    "s": 64.474,
    "l": 29.804
  },
  "oklch": {
    "l": 0.32375,
    "c": 0.14696,
    "h": 270.3
  },
  "luminance": 0.03037
}

Semantic roles & 50–950 ramp

primary

#1B257D

secondary

#B1A643

accent

#D640E7

background

#F6F5FA

surface

#ECE9F4

border

#C7C5CE

text

#07040F

muted

#7A797F

Preview Lab

Preview with #1B257D

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

Preview Lab → · Contrast checker → · Palette generator →