#1B3DA1#1B3DA1

#1B3DA1 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.5% C 0.167 H 265.1°. Best body text is #FFFFFF at 9.42:1 contrast (WCAG AA passes).

Color values

HEX	#1B3DA1
RGB	rgb(27, 61, 161)
HSL	hsl(225, 71%, 37%)
HSV	hsv(225, 83%, 63%)
CMYK	cmyk(83.2%, 62.1%, 0%, 36.9%)
CIE-LAB	lab(29.77, 26.76, -57.36)
CIE-LCH	lch(29.77, 63.30, 295.01°)
OKLab	oklab(40.46% -0.0143 -0.166)
OKLCH	oklch(40.46% 0.167 265.1)
XYZ	xyz(8.5515, 6.1427, 34.4463)
Luminance	0.0614 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B3DA1 #A17F1B

analogous

#1B80A1 #1B3DA1 #3C1BA1

triadic

#1B3DA1 #A11B3D #3DA11B

tetradic

#1B3DA1 #A11B80 #A17F1B #1BA13C

square

#1B3DA1 #A11B80 #A17F1B #1BA13C

split-complementary

#1B3DA1 #A13C1B #80A11B

monochromatic

#091538 #12296D #1B3DA1 #2451D5 #5478E2

Accessibility & contrast

On white

9.42

#1B3DA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#1B3DA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B3DA1

9.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B3DA1	#FFFFFF	#000000	##FFFFFF
##1B3DA1	1.00	9.42	2.23	9.42
#FFFFFF	9.42	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004DA4

Deuteranopia (green-blind)

#00409F

Tritanopia (blue-blind)

#005769

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #1b3da1;
/* rgb */ color: rgb(27, 61, 161);
/* oklch */ color: oklch(40.5% 0.167 265.1);

Tailwind

colors: {
  custom: {
    50: '#7072be',
    500: '#1b3da1',
    950: '#000000',
  },
}

SCSS

$custom: #1b3da1;
$custom-light: #7072be;
$custom-dark: #000000;

JSON

{
  "hex": "#1b3da1",
  "rgb": {
    "r": 27,
    "g": 61,
    "b": 161
  },
  "hsl": {
    "h": 224.776,
    "s": 71.277,
    "l": 36.863
  },
  "oklch": {
    "l": 0.40461,
    "c": 0.16661,
    "h": 265.1
  },
  "luminance": 0.06144
}

Semantic roles & 50–950 ramp

primary

#1B3DA1

secondary

#C5A852

accent

#C03AEE

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B3DA1

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

Preview Lab → · Contrast checker → · Palette generator →