#1B57B0#1B57B0

#1B57B0 is a mid, vivid blue. Relative luminance 0.102; OKLCH L 47.2% C 0.155 H 258.9°. Best body text is #FFFFFF at 6.92:1 contrast (WCAG AA passes).

Color values

HEX	#1B57B0
RGB	rgb(27, 87, 176)
HSL	hsl(216, 73%, 40%)
HSV	hsv(216, 85%, 69%)
CMYK	cmyk(84.7%, 50.6%, 0%, 31%)
CIE-LAB	lab(38.17, 15.20, -52.67)
CIE-LCH	lch(38.17, 54.82, 286.09°)
OKLab	oklab(47.18% -0.0299 -0.1517)
OKLCH	oklch(47.18% 0.155 258.9)
XYZ	xyz(11.6938, 10.1825, 42.4150)
Luminance	0.1018 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B57B0 #B0741B

analogous

#1BA2B0 #1B57B0 #2A1BB0

triadic

#1B57B0 #B01B57 #57B01B

tetradic

#1B57B0 #B01BA2 #B0741B #1BB02A

square

#1B57B0 #B01BA2 #B0741B #1BB02A

split-complementary

#1B57B0 #B02A1B #A2B01B

monochromatic

#0B2346 #133D7B #1B57B0 #2A73DE #5F96E6

Accessibility & contrast

On white

6.92

#1B57B0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.04

#1B57B0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1B57B0

6.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B57B0	#FFFFFF	#000000	##FFFFFF
##1B57B0	1.00	6.92	3.04	6.92
#FFFFFF	6.92	1.00	21.00	1.00
#000000	3.04	21.00	1.00	21.00
##FFFFFF	6.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1E61B3

Deuteranopia (green-blind)

#0054AE

Tritanopia (blue-blind)

#006D7B

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #1b57b0;
/* rgb */ color: rgb(27, 87, 176);
/* oklch */ color: oklch(47.2% 0.155 258.9);

Tailwind

colors: {
  custom: {
    50: '#7385c8',
    500: '#1b57b0',
    950: '#000000',
  },
}

SCSS

$custom: #1b57b0;
$custom-light: #7385c8;
$custom-dark: #000000;

JSON

{
  "hex": "#1b57b0",
  "rgb": {
    "r": 27,
    "g": 87,
    "b": 176
  },
  "hsl": {
    "h": 215.839,
    "s": 73.399,
    "l": 39.804
  },
  "oklch": {
    "l": 0.47179,
    "c": 0.15464,
    "h": 258.9
  },
  "luminance": 0.10184
}

Semantic roles & 50–950 ramp

primary

#1B57B0

secondary

#CB9E5C

accent

#A638F0

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#090B13

muted

#7B7C82

Preview Lab

Preview with #1B57B0

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

Preview Lab → · Contrast checker → · Palette generator →