#1B57AD#1B57AD

#1B57AD is a mid, vivid blue. Relative luminance 0.101; OKLCH L 47.0% C 0.151 H 258.4°. Best body text is #FFFFFF at 6.97:1 contrast (WCAG AA passes).

Color values

HEX	#1B57AD
RGB	rgb(27, 87, 173)
HSL	hsl(215, 73%, 39%)
HSV	hsv(215, 84%, 68%)
CMYK	cmyk(84.4%, 49.7%, 0%, 32.2%)
CIE-LAB	lab(37.96, 14.00, -51.24)
CIE-LCH	lch(37.96, 53.12, 285.28°)
OKLab	oklab(46.95% -0.0303 -0.1475)
OKLCH	oklch(46.95% 0.151 258.4)
XYZ	xyz(11.4002, 10.0651, 40.8690)
Luminance	0.1007 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B57AD #AD711B

analogous

#1BA0AD #1B57AD #281BAD

triadic

#1B57AD #AD1B57 #57AD1B

tetradic

#1B57AD #AD1BA0 #AD711B #1BAD28

square

#1B57AD #AD1BA0 #AD711B #1BAD28

split-complementary

#1B57AD #AD281B #A0AD1B

monochromatic

#0A2243 #133C78 #1B57AD #2872DD #5D95E6

Accessibility & contrast

On white

6.97

#1B57AD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.01

#1B57AD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1B57AD

6.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B57AD	#FFFFFF	#000000	##FFFFFF
##1B57AD	1.00	6.97	3.01	6.97
#FFFFFF	6.97	1.00	21.00	1.00
#000000	3.01	21.00	1.00	21.00
##FFFFFF	6.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2260B0

Deuteranopia (green-blind)

#0053AB

Tritanopia (blue-blind)

#006C7A

Achromatopsia (no color)

#595959

Design tokens & code

CSS

--color: #1b57ad;
/* rgb */ color: rgb(27, 87, 173);
/* oklch */ color: oklch(47.0% 0.151 258.4);

Tailwind

colors: {
  custom: {
    50: '#7285c6',
    500: '#1b57ad',
    950: '#000000',
  },
}

SCSS

$custom: #1b57ad;
$custom-light: #7285c6;
$custom-dark: #000000;

JSON

{
  "hex": "#1b57ad",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 173
  },
  "hsl": {
    "h": 215.342,
    "s": 73,
    "l": 39.216
  },
  "oklch": {
    "l": 0.46952,
    "c": 0.15058,
    "h": 258.4
  },
  "luminance": 0.10067
}

Semantic roles & 50–950 ramp

primary

#1B57AD

secondary

#CA9C5A

accent

#A438F0

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#090B13

muted

#7B7C82

Preview Lab

Preview with #1B57AD

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

Preview Lab → · Contrast checker → · Palette generator →