#1B57AC#1B57AC

#1B57AC is a mid, vivid blue. Relative luminance 0.100; OKLCH L 46.9% C 0.149 H 258.2°. Best body text is #FFFFFF at 6.99:1 contrast (WCAG AA passes).

Color values

HEX	#1B57AC
RGB	rgb(27, 87, 172)
HSL	hsl(215, 73%, 39%)
HSV	hsv(215, 84%, 67%)
CMYK	cmyk(84.3%, 49.4%, 0%, 32.5%)
CIE-LAB	lab(37.89, 13.60, -50.76)
CIE-LCH	lch(37.89, 52.55, 285.00°)
OKLab	oklab(46.88% -0.0305 -0.1461)
OKLCH	oklch(46.88% 0.149 258.2)
XYZ	xyz(11.3038, 10.0266, 40.3613)
Luminance	0.1003 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B57AC #AC701B

analogous

#1BA0AC #1B57AC #271BAC

triadic

#1B57AC #AC1B57 #57AC1B

tetradic

#1B57AC #AC1BA0 #AC701B #1BAC27

square

#1B57AC #AC1BA0 #AC701B #1BAC27

split-complementary

#1B57AC #AC271B #A0AC1B

monochromatic

#0A2142 #133C77 #1B57AC #2772DD #5C95E5

Accessibility & contrast

On white

6.99

#1B57AC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.01

#1B57AC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1B57AC

6.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B57AC	#FFFFFF	#000000	##FFFFFF
##1B57AC	1.00	6.99	3.01	6.99
#FFFFFF	6.99	1.00	21.00	1.00
#000000	3.01	21.00	1.00	21.00
##FFFFFF	6.99	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2460AF

Deuteranopia (green-blind)

#0053AA

Tritanopia (blue-blind)

#006C79

Achromatopsia (no color)

#595959

Design tokens & code

CSS

--color: #1b57ac;
/* rgb */ color: rgb(27, 87, 172);
/* oklch */ color: oklch(46.9% 0.149 258.2);

Tailwind

colors: {
  custom: {
    50: '#7285c5',
    500: '#1b57ac',
    950: '#000000',
  },
}

SCSS

$custom: #1b57ac;
$custom-light: #7285c5;
$custom-dark: #000000;

JSON

{
  "hex": "#1b57ac",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 172
  },
  "hsl": {
    "h": 215.172,
    "s": 72.864,
    "l": 39.02
  },
  "oklch": {
    "l": 0.46877,
    "c": 0.14922,
    "h": 258.2
  },
  "luminance": 0.10028
}

Semantic roles & 50–950 ramp

primary

#1B57AC

secondary

#C99B5A

accent

#A438F0

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#090B13

muted

#7B7C82

Preview Lab

Preview with #1B57AC

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

Preview Lab → · Contrast checker → · Palette generator →