#1B51AA#1B51AA

#1B51AA is a mid, vivid blue. Relative luminance 0.090; OKLCH L 45.4% C 0.154 H 260.1°. Best body text is #FFFFFF at 7.49:1 contrast (WCAG AA passes).

Color values

HEX	#1B51AA
RGB	rgb(27, 81, 170)
HSL	hsl(217, 73%, 39%)
HSV	hsv(217, 84%, 67%)
CMYK	cmyk(84.1%, 52.4%, 0%, 33.3%)
CIE-LAB	lab(36.02, 16.80, -52.59)
CIE-LCH	lch(36.02, 55.21, 287.72°)
OKLab	oklab(45.4% -0.0264 -0.1516)
OKLCH	oklch(45.4% 0.154 260.1)
XYZ	xyz(10.6475, 9.0188, 39.2020)
Luminance	0.0902 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B51AA #AA741B

analogous

#1B98AA #1B51AA #2D1BAA

triadic

#1B51AA #AA1B51 #51AA1B

tetradic

#1B51AA #AA1B98 #AA741B #1BAA2D

square

#1B51AA #AA1B98 #AA741B #1BAA2D

split-complementary

#1B51AA #AA2D1B #98AA1B

monochromatic

#0A1F40 #133875 #1B51AA #266BDC #5B8FE5

Accessibility & contrast

On white

7.49

#1B51AA on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.80

#1B51AA on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B51AA

7.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B51AA	#FFFFFF	#000000	##FFFFFF
##1B51AA	1.00	7.49	2.80	7.49
#FFFFFF	7.49	1.00	21.00	1.00
#000000	2.80	21.00	1.00	21.00
##FFFFFF	7.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#125CAD

Deuteranopia (green-blind)

#004FA8

Tritanopia (blue-blind)

#006775

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #1b51aa;
/* rgb */ color: rgb(27, 81, 170);
/* oklch */ color: oklch(45.4% 0.154 260.1);

Tailwind

colors: {
  custom: {
    50: '#7181c4',
    500: '#1b51aa',
    950: '#000000',
  },
}

SCSS

$custom: #1b51aa;
$custom-light: #7181c4;
$custom-dark: #000000;

JSON

{
  "hex": "#1b51aa",
  "rgb": {
    "r": 27,
    "g": 81,
    "b": 170
  },
  "hsl": {
    "h": 217.343,
    "s": 72.589,
    "l": 38.627
  },
  "oklch": {
    "l": 0.454,
    "c": 0.1539,
    "h": 260.1
  },
  "luminance": 0.0902
}

Semantic roles & 50–950 ramp

primary

#1B51AA

secondary

#C99E58

accent

#AA39EF

background

#F7F7FC

surface

#EDEEF8

border

#C8C9D1

text

#090A13

muted

#7B7C82

Preview Lab

Preview with #1B51AA

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

Preview Lab → · Contrast checker → · Palette generator →