#1F55A4#1F55A4

#1F55A4 is a mid, vivid blue. Relative luminance 0.095; OKLCH L 45.9% C 0.140 H 258.4°. Best body text is #FFFFFF at 7.26:1 contrast (WCAG AA passes).

Color values

HEX	#1F55A4
RGB	rgb(31, 85, 164)
HSL	hsl(216, 68%, 38%)
HSV	hsv(216, 81%, 64%)
CMYK	cmyk(81.1%, 48.2%, 0%, 35.7%)
CIE-LAB	lab(36.87, 12.12, -47.64)
CIE-LCH	lch(36.87, 49.16, 284.27°)
OKLab	oklab(45.95% -0.028 -0.1369)
OKLCH	oklch(45.95% 0.14 258.4)
XYZ	xyz(10.5120, 9.4674, 36.3881)
Luminance	0.0947 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F55A4 #A46E1F

analogous

#1F97A4 #1F55A4 #2B1FA4

triadic

#1F55A4 #A41F55 #55A41F

tetradic

#1F55A4 #A41F97 #A46E1F #1FA42B

square

#1F55A4 #A41F97 #A46E1F #1FA42B

split-complementary

#1F55A4 #A42B1F #97A41F

monochromatic

#0C203D #153A71 #1F55A4 #2A70D7 #5D92E0

Accessibility & contrast

On white

7.26

#1F55A4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.89

#1F55A4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F55A4

7.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F55A4	#FFFFFF	#000000	##FFFFFF
##1F55A4	1.00	7.26	2.89	7.26
#FFFFFF	7.26	1.00	21.00	1.00
#000000	2.89	21.00	1.00	21.00
##FFFFFF	7.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#285DA7

Deuteranopia (green-blind)

#0051A2

Tritanopia (blue-blind)

#006874

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #1f55a4;
/* rgb */ color: rgb(31, 85, 164);
/* oklch */ color: oklch(45.9% 0.140 258.4);

Tailwind

colors: {
  custom: {
    50: '#7184bf',
    500: '#1f55a4',
    950: '#000000',
  },
}

SCSS

$custom: #1f55a4;
$custom-light: #7184bf;
$custom-dark: #000000;

JSON

{
  "hex": "#1f55a4",
  "rgb": {
    "r": 31,
    "g": 85,
    "b": 164
  },
  "hsl": {
    "h": 215.639,
    "s": 68.205,
    "l": 38.235
  },
  "oklch": {
    "l": 0.45948,
    "c": 0.13974,
    "h": 258.4
  },
  "luminance": 0.09469
}

Semantic roles & 50–950 ramp

primary

#1F55A4

secondary

#C5995A

accent

#A43DEB

background

#F7F8FB

surface

#EDEFF7

border

#C8CAD0

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #1F55A4

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

Preview Lab → · Contrast checker → · Palette generator →