#1B45B3#1B45B3

#1B45B3 is a dark, vivid blue. Relative luminance 0.077; OKLCH L 43.7% C 0.181 H 264.2°. Best body text is #FFFFFF at 8.24:1 contrast (WCAG AA passes).

Color values

HEX	#1B45B3
RGB	rgb(27, 69, 179)
HSL	hsl(223, 74%, 40%)
HSV	hsv(223, 85%, 70%)
CMYK	cmyk(84.9%, 61.5%, 0%, 29.8%)
CIE-LAB	lab(33.44, 28.42, -62.14)
CIE-LCH	lch(33.44, 68.33, 294.58°)
OKLab	oklab(43.68% -0.0184 -0.1799)
OKLCH	oklch(43.68% 0.181 264.2)
XYZ	xyz(10.7139, 7.7426, 43.5689)
Luminance	0.0774 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B45B3 #B3891B

analogous

#1B91B3 #1B45B3 #3D1BB3

triadic

#1B45B3 #B31B45 #45B31B

tetradic

#1B45B3 #B31B91 #B3891B #1BB33D

square

#1B45B3 #B31B91 #B3891B #1BB33D

split-complementary

#1B45B3 #B33D1B #91B31B

monochromatic

#0B1C49 #13317E #1B45B3 #2C5EDF #6186E7

Accessibility & contrast

On white

8.24

#1B45B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.55

#1B45B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B45B3

8.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B45B3	#FFFFFF	#000000	##FFFFFF
##1B45B3	1.00	8.24	2.55	8.24
#FFFFFF	8.24	1.00	21.00	1.00
#000000	2.55	21.00	1.00	21.00
##FFFFFF	8.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0056B7

Deuteranopia (green-blind)

#0048B1

Tritanopia (blue-blind)

#006275

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #1b45b3;
/* rgb */ color: rgb(27, 69, 179);
/* oklch */ color: oklch(43.7% 0.181 264.2);

Tailwind

colors: {
  custom: {
    50: '#7578cb',
    500: '#1b45b3',
    950: '#000000',
  },
}

SCSS

$custom: #1b45b3;
$custom-light: #7578cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1b45b3",
  "rgb": {
    "r": 27,
    "g": 69,
    "b": 179
  },
  "hsl": {
    "h": 223.421,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.43677,
    "c": 0.1808,
    "h": 264.2
  },
  "luminance": 0.07744
}

Semantic roles & 50–950 ramp

primary

#1B45B3

secondary

#CCAD5E

accent

#BD37F0

background

#F7F7FC

surface

#EEEDF9

border

#C9C8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #1B45B3

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

Preview Lab → · Contrast checker → · Palette generator →