#1B57B3#1B57B3

#1B57B3 is a mid, vivid blue. Relative luminance 0.103; OKLCH L 47.4% C 0.159 H 259.3°. Best body text is #FFFFFF at 6.86:1 contrast (WCAG AA passes).

Color values

HEX	#1B57B3
RGB	rgb(27, 87, 179)
HSL	hsl(216, 74%, 40%)
HSV	hsv(216, 85%, 70%)
CMYK	cmyk(84.9%, 51.4%, 0%, 29.8%)
CIE-LAB	lab(38.38, 16.39, -54.10)
CIE-LCH	lch(38.38, 56.53, 286.86°)
OKLab	oklab(47.41% -0.0294 -0.1559)
OKLCH	oklch(47.41% 0.159 259.3)
XYZ	xyz(11.9939, 10.3026, 43.9955)
Luminance	0.1030 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B57B3 #B3771B

analogous

#1BA3B3 #1B57B3 #2B1BB3

triadic

#1B57B3 #B31B57 #57B31B

tetradic

#1B57B3 #B31BA3 #B3771B #1BB32B

square

#1B57B3 #B31BA3 #B3771B #1BB32B

split-complementary

#1B57B3 #B32B1B #A3B31B

monochromatic

#0B2349 #133D7E #1B57B3 #2C73DF #6196E7

Accessibility & contrast

On white

6.86

#1B57B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.06

#1B57B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1B57B3

6.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B57B3	#FFFFFF	#000000	##FFFFFF
##1B57B3	1.00	6.86	3.06	6.86
#FFFFFF	6.86	1.00	21.00	1.00
#000000	3.06	21.00	1.00	21.00
##FFFFFF	6.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1962B6

Deuteranopia (green-blind)

#0054B1

Tritanopia (blue-blind)

#006D7C

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #1b57b3;
/* rgb */ color: rgb(27, 87, 179);
/* oklch */ color: oklch(47.4% 0.159 259.3);

Tailwind

colors: {
  custom: {
    50: '#7385ca',
    500: '#1b57b3',
    950: '#000000',
  },
}

SCSS

$custom: #1b57b3;
$custom-light: #7385ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1b57b3",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 179
  },
  "hsl": {
    "h": 216.316,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.47409,
    "c": 0.15869,
    "h": 259.3
  },
  "luminance": 0.10304
}

Semantic roles & 50–950 ramp

primary

#1B57B3

secondary

#CCA05E

accent

#A737F0

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1B57B3

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

Preview Lab → · Contrast checker → · Palette generator →