#1F55A5#1F55A5

#1F55A5 is a mid, vivid blue. Relative luminance 0.095; OKLCH L 46.0% C 0.141 H 258.6°. Best body text is #FFFFFF at 7.24:1 contrast (WCAG AA passes).

Color values

HEX	#1F55A5
RGB	rgb(31, 85, 165)
HSL	hsl(216, 68%, 38%)
HSV	hsv(216, 81%, 65%)
CMYK	cmyk(81.2%, 48.5%, 0%, 35.3%)
CIE-LAB	lab(36.94, 12.52, -48.13)
CIE-LCH	lch(36.94, 49.73, 284.58°)
OKLab	oklab(46.02% -0.0279 -0.1383)
OKLCH	oklch(46.02% 0.141 258.6)
XYZ	xyz(10.6026, 9.5036, 36.8656)
Luminance	0.0950 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F55A5 #A56F1F

analogous

#1F98A5 #1F55A5 #2C1FA5

triadic

#1F55A5 #A51F55 #55A51F

tetradic

#1F55A5 #A51F98 #A56F1F #1FA52C

square

#1F55A5 #A51F98 #A56F1F #1FA52C

split-complementary

#1F55A5 #A52C1F #98A51F

monochromatic

#0C203E #153A71 #1F55A5 #2A70D7 #5E92E1

Accessibility & contrast

On white

7.24

#1F55A5 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.90

#1F55A5 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F55A5

7.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F55A5	#FFFFFF	#000000	##FFFFFF
##1F55A5	1.00	7.24	2.90	7.24
#FFFFFF	7.24	1.00	21.00	1.00
#000000	2.90	21.00	1.00	21.00
##FFFFFF	7.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#275DA8

Deuteranopia (green-blind)

#0051A3

Tritanopia (blue-blind)

#006875

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #1f55a5;
/* rgb */ color: rgb(31, 85, 165);
/* oklch */ color: oklch(46.0% 0.141 258.6);

Tailwind

colors: {
  custom: {
    50: '#7184c0',
    500: '#1f55a5',
    950: '#000000',
  },
}

SCSS

$custom: #1f55a5;
$custom-light: #7184c0;
$custom-dark: #000000;

JSON

{
  "hex": "#1f55a5",
  "rgb": {
    "r": 31,
    "g": 85,
    "b": 165
  },
  "hsl": {
    "h": 215.821,
    "s": 68.367,
    "l": 38.431
  },
  "oklch": {
    "l": 0.46022,
    "c": 0.14112,
    "h": 258.6
  },
  "luminance": 0.09505
}

Semantic roles & 50–950 ramp

primary

#1F55A5

secondary

#C59A5B

accent

#A53DEB

background

#F7F8FB

surface

#EDEFF7

border

#C8CAD0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1F55A5

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

Preview Lab → · Contrast checker → · Palette generator →