#1F17B3#1F17B3

#1F17B3 is a dark, highly saturated blue. Relative luminance 0.042; OKLCH L 37.1% C 0.224 H 269.8°. Best body text is #FFFFFF at 11.46:1 contrast (WCAG AA passes).

Color values

HEX	#1F17B3
RGB	rgb(31, 23, 179)
HSL	hsl(243, 77%, 40%)
HSV	hsv(243, 87%, 70%)
CMYK	cmyk(82.7%, 87.2%, 0%, 29.8%)
CIE-LAB	lab(24.19, 54.73, -77.41)
CIE-LCH	lch(24.19, 94.80, 305.26°)
OKLab	oklab(37.08% -0.0008 -0.2239)
OKLCH	oklch(37.08% 0.224 269.8)
XYZ	xyz(9.0054, 4.1577, 42.9670)
Luminance	0.0416 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F17B3 #ABB317

analogous

#175DB3 #1F17B3 #6D17B3

triadic

#1F17B3 #B31F17 #17B31F

tetradic

#1F17B3 #B3175D #ABB317 #17B36D

square

#1F17B3 #B3175D #ABB317 #17B36D

split-complementary

#1F17B3 #B36D17 #5DB317

monochromatic

#0C0947 #16107D #1F17B3 #2E24E3 #625BEA

Accessibility & contrast

On white

11.46

#1F17B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#1F17B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F17B3

11.46:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F17B3	#FFFFFF	#000000	##FFFFFF
##1F17B3	1.00	11.46	1.83	11.46
#FFFFFF	11.46	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.46	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0041B7

Deuteranopia (green-blind)

#0031B1

Tritanopia (blue-blind)

#004D6A

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #1f17b3;
/* rgb */ color: rgb(31, 23, 179);
/* oklch */ color: oklch(37.1% 0.224 269.8);

Tailwind

colors: {
  custom: {
    50: '#7a5bcb',
    500: '#1f17b3',
    950: '#000000',
  },
}

SCSS

$custom: #1f17b3;
$custom-light: #7a5bcb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f17b3",
  "rgb": {
    "r": 31,
    "g": 23,
    "b": 179
  },
  "hsl": {
    "h": 243.077,
    "s": 77.228,
    "l": 39.608
  },
  "oklch": {
    "l": 0.3708,
    "c": 0.22394,
    "h": 269.8
  },
  "luminance": 0.04159
}

Semantic roles & 50–950 ramp

primary

#1F17B3

secondary

#C7CD58

accent

#F434EA

background

#F8F5FC

surface

#EFE9F9

border

#CAC5D2

text

#0B0414

muted

#7C7982

Preview Lab

Preview with #1F17B3

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

Preview Lab → · Contrast checker → · Palette generator →