#1F55B3#1F55B3

#1F55B3 is a mid, vivid blue. Relative luminance 0.100; OKLCH L 47.1% C 0.160 H 260.7°. Best body text is #FFFFFF at 6.98:1 contrast (WCAG AA passes).

Color values

HEX	#1F55B3
RGB	rgb(31, 85, 179)
HSL	hsl(218, 70%, 41%)
HSV	hsv(218, 83%, 70%)
CMYK	cmyk(82.7%, 52.5%, 0%, 29.8%)
CIE-LAB	lab(37.92, 18.07, -54.84)
CIE-LCH	lch(37.92, 57.74, 288.23°)
OKLab	oklab(47.09% -0.0259 -0.1581)
OKLCH	oklch(47.09% 0.16 260.7)
XYZ	xyz(11.9473, 10.0415, 43.9476)
Luminance	0.1004 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F55B3 #B37D1F

analogous

#1F9FB3 #1F55B3 #331FB3

triadic

#1F55B3 #B31F55 #55B31F

tetradic

#1F55B3 #B31F9F #B37D1F #1FB333

square

#1F55B3 #B31F9F #B37D1F #1FB333

split-complementary

#1F55B3 #B3331F #9FB31F

monochromatic

#0D234B #163C7F #1F55B3 #3371DC #6895E5

Accessibility & contrast

On white

6.98

#1F55B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.01

#1F55B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1F55B3

6.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F55B3	#FFFFFF	#000000	##FFFFFF
##1F55B3	1.00	6.98	3.01	6.98
#FFFFFF	6.98	1.00	21.00	1.00
#000000	3.01	21.00	1.00	21.00
##FFFFFF	6.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1060B6

Deuteranopia (green-blind)

#0053B1

Tritanopia (blue-blind)

#006C7C

Achromatopsia (no color)

#595959

Design tokens & code

CSS

--color: #1f55b3;
/* rgb */ color: rgb(31, 85, 179);
/* oklch */ color: oklch(47.1% 0.160 260.7);

Tailwind

colors: {
  custom: {
    50: '#7484ca',
    500: '#1f55b3',
    950: '#000000',
  },
}

SCSS

$custom: #1f55b3;
$custom-light: #7484ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1f55b3",
  "rgb": {
    "r": 31,
    "g": 85,
    "b": 179
  },
  "hsl": {
    "h": 218.108,
    "s": 70.476,
    "l": 41.176
  },
  "oklch": {
    "l": 0.47085,
    "c": 0.16022,
    "h": 260.7
  },
  "luminance": 0.10043
}

Semantic roles & 50–950 ramp

primary

#1F55B3

secondary

#CAA564

accent

#AC3BED

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #1F55B3

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

Preview Lab → · Contrast checker → · Palette generator →