#1F45B1#1F45B1

#1F45B1 is a dark, vivid blue. Relative luminance 0.077; OKLCH L 43.6% C 0.177 H 264.9°. Best body text is #FFFFFF at 8.25:1 contrast (WCAG AA passes).

Color values

HEX	#1F45B1
RGB	rgb(31, 69, 177)
HSL	hsl(224, 70%, 41%)
HSV	hsv(224, 82%, 69%)
CMYK	cmyk(82.5%, 61%, 0%, 30.6%)
CIE-LAB	lab(33.39, 27.96, -61.02)
CIE-LCH	lch(33.39, 67.12, 294.62°)
OKLab	oklab(43.62% -0.0158 -0.1765)
OKLCH	oklch(43.62% 0.177 264.9)
XYZ	xyz(10.6262, 7.7206, 42.5166)
Luminance	0.0772 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F45B1 #B18B1F

analogous

#1F8EB1 #1F45B1 #421FB1

triadic

#1F45B1 #B11F45 #45B11F

tetradic

#1F45B1 #B11F8E #B18B1F #1FB142

square

#1F45B1 #B11F8E #B18B1F #1FB142

split-complementary

#1F45B1 #B1421F #8EB11F

monochromatic

#0D1C49 #16317D #1F45B1 #325EDB #6687E4

Accessibility & contrast

On white

8.25

#1F45B1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.54

#1F45B1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F45B1

8.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F45B1	#FFFFFF	#000000	##FFFFFF
##1F45B1	1.00	8.25	2.54	8.25
#FFFFFF	8.25	1.00	21.00	1.00
#000000	2.54	21.00	1.00	21.00
##FFFFFF	8.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056B5

Deuteranopia (green-blind)

#0048AF

Tritanopia (blue-blind)

#006174

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #1f45b1;
/* rgb */ color: rgb(31, 69, 177);
/* oklch */ color: oklch(43.6% 0.177 264.9);

Tailwind

colors: {
  custom: {
    50: '#7578c9',
    500: '#1f45b1',
    950: '#000000',
  },
}

SCSS

$custom: #1f45b1;
$custom-light: #7578c9;
$custom-dark: #000000;

JSON

{
  "hex": "#1f45b1",
  "rgb": {
    "r": 31,
    "g": 69,
    "b": 177
  },
  "hsl": {
    "h": 224.384,
    "s": 70.192,
    "l": 40.784
  },
  "oklch": {
    "l": 0.43624,
    "c": 0.17724,
    "h": 264.9
  },
  "luminance": 0.07722
}

Semantic roles & 50–950 ramp

primary

#1F45B1

secondary

#CAAF62

accent

#BF3BED

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #1F45B1

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

Preview Lab → · Contrast checker → · Palette generator →