#1F59B4#1F59B4

#1F59B4 is a mid, vivid blue. Relative luminance 0.107; OKLCH L 48.0% C 0.157 H 259.5°. Best body text is #FFFFFF at 6.67:1 contrast (WCAG AA passes).

Color values

HEX	#1F59B4
RGB	rgb(31, 89, 180)
HSL	hsl(217, 71%, 41%)
HSV	hsv(217, 83%, 71%)
CMYK	cmyk(82.8%, 50.6%, 0%, 29.4%)
CIE-LAB	lab(39.12, 15.81, -53.48)
CIE-LCH	lch(39.12, 55.77, 286.47°)
OKLab	oklab(48.03% -0.0286 -0.154)
OKLCH	oklch(48.03% 0.157 259.5)
XYZ	xyz(12.3727, 10.7298, 44.5901)
Luminance	0.1073 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F59B4 #B47A1F

analogous

#1FA4B4 #1F59B4 #2F1FB4

triadic

#1F59B4 #B41F59 #59B41F

tetradic

#1F59B4 #B41FA4 #B47A1F #1FB42F

square

#1F59B4 #B41FA4 #B47A1F #1FB42F

split-complementary

#1F59B4 #B42F1F #A4B41F

monochromatic

#0D254C #163F80 #1F59B4 #3476DC #6899E5

Accessibility & contrast

On white

6.67

#1F59B4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.15

#1F59B4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F59B4

6.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F59B4	#FFFFFF	#000000	##FFFFFF
##1F59B4	1.00	6.67	3.15	6.67
#FFFFFF	6.67	1.00	21.00	1.00
#000000	3.15	21.00	1.00	21.00
##FFFFFF	6.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F63B7

Deuteranopia (green-blind)

#0056B2

Tritanopia (blue-blind)

#006F7E

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #1f59b4;
/* rgb */ color: rgb(31, 89, 180);
/* oklch */ color: oklch(48.0% 0.157 259.5);

Tailwind

colors: {
  custom: {
    50: '#7587cb',
    500: '#1f59b4',
    950: '#000000',
  },
}

SCSS

$custom: #1f59b4;
$custom-light: #7587cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f59b4",
  "rgb": {
    "r": 31,
    "g": 89,
    "b": 180
  },
  "hsl": {
    "h": 216.644,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.48028,
    "c": 0.15667,
    "h": 259.5
  },
  "luminance": 0.10731
}

Semantic roles & 50–950 ramp

primary

#1F59B4

secondary

#CBA364

accent

#A83AED

background

#F7F8FC

surface

#EEEFF9

border

#C9CAD2

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1F59B4

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

Preview Lab → · Contrast checker → · Palette generator →