#1731B4#1731B4

#1731B4 is a dark, highly saturated blue. Relative luminance 0.057; OKLCH L 40.1% C 0.206 H 266.4°. Best body text is #FFFFFF at 9.84:1 contrast (WCAG AA passes).

Color values

HEX	#1731B4
RGB	rgb(23, 49, 180)
HSL	hsl(230, 77%, 40%)
HSV	hsv(230, 87%, 71%)
CMYK	cmyk(87.2%, 72.8%, 0%, 29.4%)
CIE-LAB	lab(28.57, 41.44, -70.74)
CIE-LCH	lch(28.57, 81.98, 300.36°)
OKLab	oklab(40.11% -0.0129 -0.2051)
OKLCH	oklch(40.11% 0.206 266.4)
XYZ	xyz(9.6870, 5.6728, 43.7556)
Luminance	0.0567 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 7.12

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1731B4 #B49A17

analogous

#177FB4 #1731B4 #4C17B4

triadic

#1731B4 #B41731 #31B417

tetradic

#1731B4 #B4177F #B49A17 #17B44C

square

#1731B4 #B4177F #B49A17 #17B44C

split-complementary

#1731B4 #B44C17 #7FB417

monochromatic

#091347 #10227E #1731B4 #2545E3 #5B73EA

Accessibility & contrast

On white

9.84

#1731B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#1731B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1731B4

9.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1731B4	#FFFFFF	#000000	##FFFFFF
##1731B4	1.00	9.84	2.13	9.84
#FFFFFF	9.84	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004BB8

Deuteranopia (green-blind)

#003CB2

Tritanopia (blue-blind)

#00576F

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #1731b4;
/* rgb */ color: rgb(23, 49, 180);
/* oklch */ color: oklch(40.1% 0.206 266.4);

Tailwind

colors: {
  custom: {
    50: '#766acc',
    500: '#1731b4',
    950: '#000000',
  },
}

SCSS

$custom: #1731b4;
$custom-light: #766acc;
$custom-dark: #000000;

JSON

{
  "hex": "#1731b4",
  "rgb": {
    "r": 23,
    "g": 49,
    "b": 180
  },
  "hsl": {
    "h": 230.064,
    "s": 77.34,
    "l": 39.804
  },
  "oklch": {
    "l": 0.40105,
    "c": 0.20555,
    "h": 266.4
  },
  "luminance": 0.05674
}

Semantic roles & 50–950 ramp

primary

#1731B4

secondary

#CEBA59

accent

#D434F4

background

#F8F6FC

surface

#EFEBF9

border

#CAC6D2

text

#0A0614

muted

#7C7A82

Preview Lab

Preview with #1731B4

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

Preview Lab → · Contrast checker → · Palette generator →