#1F55C3#1F55C3

#1F55C3 is a mid, vivid blue. Relative luminance 0.107; OKLCH L 48.4% C 0.182 H 262.3°. Best body text is #FFFFFF at 6.68:1 contrast (WCAG AA passes).

Color values

HEX	#1F55C3
RGB	rgb(31, 85, 195)
HSL	hsl(220, 73%, 44%)
HSV	hsv(220, 84%, 76%)
CMYK	cmyk(84.1%, 56.4%, 0%, 23.5%)
CIE-LAB	lab(39.12, 24.33, -62.27)
CIE-LCH	lch(39.12, 66.85, 291.35°)
OKLab	oklab(48.37% -0.0244 -0.1799)
OKLCH	oklch(48.37% 0.182 262.3)
XYZ	xyz(13.6603, 10.7267, 52.9697)
Luminance	0.1073 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F55C3 #C38D1F

analogous

#1FA7C3 #1F55C3 #3B1FC3

triadic

#1F55C3 #C31F55 #55C31F

tetradic

#1F55C3 #C31FA7 #C38D1F #1FC33B

square

#1F55C3 #C31FA7 #C38D1F #1FC33B

split-complementary

#1F55C3 #C33B1F #A7C31F

monochromatic

#0E2759 #173E8E #1F55C3 #3F74E0 #749AE9

Accessibility & contrast

On white

6.68

#1F55C3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.15

#1F55C3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F55C3

6.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F55C3	#FFFFFF	#000000	##FFFFFF
##1F55C3	1.00	6.68	3.15	6.68
#FFFFFF	6.68	1.00	21.00	1.00
#000000	3.15	21.00	1.00	21.00
##FFFFFF	6.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0064C7

Deuteranopia (green-blind)

#0055C1

Tritanopia (blue-blind)

#007183

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #1f55c3;
/* rgb */ color: rgb(31, 85, 195);
/* oklch */ color: oklch(48.4% 0.182 262.3);

Tailwind

colors: {
  custom: {
    50: '#7884d6',
    500: '#1f55c3',
    950: '#000000',
  },
}

SCSS

$custom: #1f55c3;
$custom-light: #7884d6;
$custom-dark: #000000;

JSON

{
  "hex": "#1f55c3",
  "rgb": {
    "r": 31,
    "g": 85,
    "b": 195
  },
  "hsl": {
    "h": 220.244,
    "s": 72.566,
    "l": 44.314
  },
  "oklch": {
    "l": 0.48373,
    "c": 0.18158,
    "h": 262.3
  },
  "luminance": 0.10728
}

Semantic roles & 50–950 ramp

primary

#1F55C3

secondary

#D0B06E

accent

#B339EF

background

#F8F8FD

surface

#EFEFFA

border

#CACAD3

text

#0B0A14

muted

#7C7C83

Preview Lab

Preview with #1F55C3

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

Preview Lab → · Contrast checker → · Palette generator →