#1B57B4#1B57B4

#1B57B4 is a mid, vivid blue. Relative luminance 0.103; OKLCH L 47.5% C 0.160 H 259.4°. Best body text is #FFFFFF at 6.84:1 contrast (WCAG AA passes).

Color values

HEX	#1B57B4
RGB	rgb(27, 87, 180)
HSL	hsl(216, 74%, 41%)
HSV	hsv(216, 85%, 71%)
CMYK	cmyk(85%, 51.7%, 0%, 29.4%)
CIE-LAB	lab(38.45, 16.79, -54.57)
CIE-LCH	lch(38.45, 57.10, 287.10°)
OKLab	oklab(47.49% -0.0293 -0.1573)
OKLCH	oklch(47.49% 0.16 259.4)
XYZ	xyz(12.0954, 10.3432, 44.5301)
Luminance	0.1035 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B57B4 #B4781B

analogous

#1BA3B4 #1B57B4 #2C1BB4

triadic

#1B57B4 #B41B57 #57B41B

tetradic

#1B57B4 #B41BA3 #B4781B #1BB42C

square

#1B57B4 #B41BA3 #B4781B #1BB42C

split-complementary

#1B57B4 #B42C1B #A3B41B

monochromatic

#0B244A #133D7F #1B57B4 #2D73DF #6296E7

Accessibility & contrast

On white

6.84

#1B57B4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.07

#1B57B4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1B57B4

6.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B57B4	#FFFFFF	#000000	##FFFFFF
##1B57B4	1.00	6.84	3.07	6.84
#FFFFFF	6.84	1.00	21.00	1.00
#000000	3.07	21.00	1.00	21.00
##FFFFFF	6.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1762B7

Deuteranopia (green-blind)

#0054B2

Tritanopia (blue-blind)

#006E7D

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #1b57b4;
/* rgb */ color: rgb(27, 87, 180);
/* oklch */ color: oklch(47.5% 0.160 259.4);

Tailwind

colors: {
  custom: {
    50: '#7485cb',
    500: '#1b57b4',
    950: '#000000',
  },
}

SCSS

$custom: #1b57b4;
$custom-light: #7485cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1b57b4",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 180
  },
  "hsl": {
    "h": 216.471,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.47486,
    "c": 0.16003,
    "h": 259.4
  },
  "luminance": 0.10345
}

Semantic roles & 50–950 ramp

primary

#1B57B4

secondary

#CCA15F

accent

#A837F1

background

#F7F8FC

surface

#EEEFF9

border

#C9CAD2

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1B57B4

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

Preview Lab → · Contrast checker → · Palette generator →