#1F59BB#1F59BB

#1F59BB is a mid, vivid blue. Relative luminance 0.110; OKLCH L 48.6% C 0.166 H 260.4°. Best body text is #FFFFFF at 6.55:1 contrast (WCAG AA passes).

Color values

HEX	#1F59BB
RGB	rgb(31, 89, 187)
HSL	hsl(218, 72%, 43%)
HSV	hsv(218, 83%, 73%)
CMYK	cmyk(83.4%, 52.4%, 0%, 26.7%)
CIE-LAB	lab(39.62, 18.57, -56.79)
CIE-LCH	lch(39.62, 59.74, 288.11°)
OKLab	oklab(48.57% -0.0277 -0.1637)
OKLCH	oklch(48.57% 0.166 260.4)
XYZ	xyz(13.1038, 11.0223, 48.4410)
Luminance	0.1102 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F59BB #BB811F

analogous

#1FA7BB #1F59BB #331FBB

triadic

#1F59BB #BB1F59 #59BB1F

tetradic

#1F59BB #BB1FA7 #BB811F #1FBB33

square

#1F59BB #BB1FA7 #BB811F #1FBB33

split-complementary

#1F59BB #BB331F #A7BB1F

monochromatic

#0E2752 #164087 #1F59BB #3976DE #6E9BE7

Accessibility & contrast

On white

6.55

#1F59BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.20

#1F59BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F59BB

6.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F59BB	#FFFFFF	#000000	##FFFFFF
##1F59BB	1.00	6.55	3.20	6.55
#FFFFFF	6.55	1.00	21.00	1.00
#000000	3.20	21.00	1.00	21.00
##FFFFFF	6.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1165BE

Deuteranopia (green-blind)

#0057B9

Tritanopia (blue-blind)

#007181

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #1f59bb;
/* rgb */ color: rgb(31, 89, 187);
/* oklch */ color: oklch(48.6% 0.166 260.4);

Tailwind

colors: {
  custom: {
    50: '#7687d0',
    500: '#1f59bb',
    950: '#000000',
  },
}

SCSS

$custom: #1f59bb;
$custom-light: #7687d0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f59bb",
  "rgb": {
    "r": 31,
    "g": 89,
    "b": 187
  },
  "hsl": {
    "h": 217.692,
    "s": 71.56,
    "l": 42.745
  },
  "oklch": {
    "l": 0.48565,
    "c": 0.16607,
    "h": 260.4
  },
  "luminance": 0.11024
}

Semantic roles & 50–950 ramp

primary

#1F59BB

secondary

#CDA869

accent

#AB3AEE

background

#F7F8FC

surface

#EEEFF9

border

#C9CAD2

text

#0A0B14

muted

#7C7C82

Preview Lab

Preview with #1F59BB

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

Preview Lab → · Contrast checker → · Palette generator →