#1F59B3#1F59B3

#1F59B3 is a mid, vivid blue. Relative luminance 0.107; OKLCH L 48.0% C 0.155 H 259.3°. Best body text is #FFFFFF at 6.69:1 contrast (WCAG AA passes).

Color values

HEX	#1F59B3
RGB	rgb(31, 89, 179)
HSL	hsl(216, 70%, 41%)
HSV	hsv(216, 83%, 70%)
CMYK	cmyk(82.7%, 50.3%, 0%, 29.8%)
CIE-LAB	lab(39.05, 15.42, -53.01)
CIE-LCH	lch(39.05, 55.20, 286.21°)
OKLab	oklab(47.95% -0.0288 -0.1526)
OKLCH	oklch(47.95% 0.155 259.3)
XYZ	xyz(12.2712, 10.6892, 44.0556)
Luminance	0.1069 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F59B3 #B3791F

analogous

#1FA3B3 #1F59B3 #2F1FB3

triadic

#1F59B3 #B31F59 #59B31F

tetradic

#1F59B3 #B31FA3 #B3791F #1FB32F

square

#1F59B3 #B31FA3 #B3791F #1FB32F

split-complementary

#1F59B3 #B32F1F #A3B31F

monochromatic

#0D254B #163F7F #1F59B3 #3375DC #6899E5

Accessibility & contrast

On white

6.69

#1F59B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.14

#1F59B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F59B3

6.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F59B3	#FFFFFF	#000000	##FFFFFF
##1F59B3	1.00	6.69	3.14	6.69
#FFFFFF	6.69	1.00	21.00	1.00
#000000	3.14	21.00	1.00	21.00
##FFFFFF	6.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2163B6

Deuteranopia (green-blind)

#0056B1

Tritanopia (blue-blind)

#006F7D

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #1f59b3;
/* rgb */ color: rgb(31, 89, 179);
/* oklch */ color: oklch(48.0% 0.155 259.3);

Tailwind

colors: {
  custom: {
    50: '#7487ca',
    500: '#1f59b3',
    950: '#000000',
  },
}

SCSS

$custom: #1f59b3;
$custom-light: #7487ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1f59b3",
  "rgb": {
    "r": 31,
    "g": 89,
    "b": 179
  },
  "hsl": {
    "h": 216.486,
    "s": 70.476,
    "l": 41.176
  },
  "oklch": {
    "l": 0.47952,
    "c": 0.15532,
    "h": 259.3
  },
  "luminance": 0.10691
}

Semantic roles & 50–950 ramp

primary

#1F59B3

secondary

#CAA264

accent

#A73BED

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1F59B3

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

Preview Lab → · Contrast checker → · Palette generator →