#1F18B3#1F18B3

#1F18B3 is a dark, highly saturated blue. Relative luminance 0.042; OKLCH L 37.2% C 0.223 H 269.8°. Best body text is #FFFFFF at 11.41:1 contrast (WCAG AA passes).

Color values

HEX	#1F18B3
RGB	rgb(31, 24, 179)
HSL	hsl(243, 76%, 40%)
HSV	hsv(243, 87%, 70%)
CMYK	cmyk(82.7%, 86.6%, 0%, 29.8%)
CIE-LAB	lab(24.32, 54.34, -77.19)
CIE-LCH	lch(24.32, 94.40, 305.14°)
OKLab	oklab(37.17% -0.0009 -0.2233)
OKLCH	oklch(37.17% 0.223 269.8)
XYZ	xyz(9.0256, 4.1982, 42.9737)
Luminance	0.0420 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F18B3 #ACB318

analogous

#185EB3 #1F18B3 #6D18B3

triadic

#1F18B3 #B31F18 #18B31F

tetradic

#1F18B3 #B3185E #ACB318 #18B36D

square

#1F18B3 #B3185E #ACB318 #18B36D

split-complementary

#1F18B3 #B36D18 #5EB318

monochromatic

#0C0A47 #16117D #1F18B3 #2F26E2 #635CE9

Accessibility & contrast

On white

11.41

#1F18B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.84

#1F18B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F18B3

11.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F18B3	#FFFFFF	#000000	##FFFFFF
##1F18B3	1.00	11.41	1.84	11.41
#FFFFFF	11.41	1.00	21.00	1.00
#000000	1.84	21.00	1.00	21.00
##FFFFFF	11.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0041B7

Deuteranopia (green-blind)

#0032B1

Tritanopia (blue-blind)

#004D6A

Achromatopsia (no color)

#3A3A3A

Design tokens & code

CSS

--color: #1f18b3;
/* rgb */ color: rgb(31, 24, 179);
/* oklch */ color: oklch(37.2% 0.223 269.8);

Tailwind

colors: {
  custom: {
    50: '#7a5ccb',
    500: '#1f18b3',
    950: '#000000',
  },
}

SCSS

$custom: #1f18b3;
$custom-light: #7a5ccb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f18b3",
  "rgb": {
    "r": 31,
    "g": 24,
    "b": 179
  },
  "hsl": {
    "h": 242.71,
    "s": 76.355,
    "l": 39.804
  },
  "oklch": {
    "l": 0.37169,
    "c": 0.22334,
    "h": 269.8
  },
  "luminance": 0.04199
}

Semantic roles & 50–950 ramp

primary

#1F18B3

secondary

#C8CD5A

accent

#F335EA

background

#F8F5FC

surface

#EFE9F9

border

#CAC5D2

text

#0B0414

muted

#7C7982

Preview Lab

Preview with #1F18B3

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

Preview Lab → · Contrast checker → · Palette generator →