#1F23B3#1F23B3

#1F23B3 is a dark, highly saturated blue. Relative luminance 0.047; OKLCH L 38.3% C 0.215 H 269.3°. Best body text is #FFFFFF at 10.77:1 contrast (WCAG AA passes).

Color values

HEX	#1F23B3
RGB	rgb(31, 35, 179)
HSL	hsl(238, 70%, 41%)
HSV	hsv(238, 83%, 70%)
CMYK	cmyk(82.7%, 80.4%, 0%, 29.8%)
CIE-LAB	lab(26.00, 49.36, -74.39)
CIE-LCH	lch(26.00, 89.28, 303.57°)
OKLab	oklab(38.34% -0.0027 -0.2155)
OKLCH	oklch(38.34% 0.215 269.3)
XYZ	xyz(9.3000, 4.7469, 43.0652)
Luminance	0.0475 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F23B3 #B3AF1F

analogous

#1F6DB3 #1F23B3 #651FB3

triadic

#1F23B3 #B31F23 #23B31F

tetradic

#1F23B3 #B31F6D #B3AF1F #1FB365

square

#1F23B3 #B31F6D #B3AF1F #1FB365

split-complementary

#1F23B3 #B3651F #6DB31F

monochromatic

#0D0F4B #16197F #1F23B3 #3338DC #686BE5

Accessibility & contrast

On white

10.77

#1F23B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#1F23B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F23B3

10.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F23B3	#FFFFFF	#000000	##FFFFFF
##1F23B3	1.00	10.77	1.95	10.77
#FFFFFF	10.77	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0045B7

Deuteranopia (green-blind)

#0036B1

Tritanopia (blue-blind)

#00506C

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #1f23b3;
/* rgb */ color: rgb(31, 35, 179);
/* oklch */ color: oklch(38.3% 0.215 269.3);

Tailwind

colors: {
  custom: {
    50: '#7961cb',
    500: '#1f23b3',
    950: '#000000',
  },
}

SCSS

$custom: #1f23b3;
$custom-light: #7961cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f23b3",
  "rgb": {
    "r": 31,
    "g": 35,
    "b": 179
  },
  "hsl": {
    "h": 238.378,
    "s": 70.476,
    "l": 41.176
  },
  "oklch": {
    "l": 0.38335,
    "c": 0.21548,
    "h": 269.3
  },
  "luminance": 0.04748
}

Semantic roles & 50–950 ramp

primary

#1F23B3

secondary

#CAC764

accent

#E83BED

background

#F8F5FC

surface

#EFEAF9

border

#CAC6D2

text

#0B0514

muted

#7C7982

Preview Lab

Preview with #1F23B3

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

Preview Lab → · Contrast checker → · Palette generator →