#1B359F#1B359F

#1B359F is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.7% C 0.174 H 266.7°. Best body text is #FFFFFF at 10.21:1 contrast (WCAG AA passes).

Color values

HEX	#1B359F
RGB	rgb(27, 53, 159)
HSL	hsl(228, 71%, 36%)
HSV	hsv(228, 83%, 62%)
CMYK	cmyk(83%, 66.7%, 0%, 37.6%)
CIE-LAB	lab(27.52, 31.35, -59.84)
CIE-LCH	lch(27.52, 67.55, 297.65°)
OKLab	oklab(38.74% -0.01 -0.1733)
OKLCH	oklch(38.74% 0.174 266.7)
XYZ	xyz(7.9809, 5.2815, 33.3930)
Luminance	0.0528 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B359F #9F851B

analogous

#1B779F #1B359F #431B9F

triadic

#1B359F #9F1B35 #359F1B

tetradic

#1B359F #9F1B77 #9F851B #1B9F43

square

#1B359F #9F1B77 #9F851B #1B9F43

split-complementary

#1B359F #9F431B #779F1B

monochromatic

#091236 #12246B #1B359F #2446D3 #536FE2

Accessibility & contrast

On white

10.21

#1B359F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#1B359F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B359F

10.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B359F	#FFFFFF	#000000	##FFFFFF
##1B359F	1.00	10.21	2.06	10.21
#FFFFFF	10.21	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0047A2

Deuteranopia (green-blind)

#003B9D

Tritanopia (blue-blind)

#005265

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #1b359f;
/* rgb */ color: rgb(27, 53, 159);
/* oklch */ color: oklch(38.7% 0.174 266.7);

Tailwind

colors: {
  custom: {
    50: '#716cbc',
    500: '#1b359f',
    950: '#000000',
  },
}

SCSS

$custom: #1b359f;
$custom-light: #716cbc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b359f",
  "rgb": {
    "r": 27,
    "g": 53,
    "b": 159
  },
  "hsl": {
    "h": 228.182,
    "s": 70.968,
    "l": 36.471
  },
  "oklch": {
    "l": 0.38744,
    "c": 0.17361,
    "h": 266.7
  },
  "luminance": 0.05282
}

Semantic roles & 50–950 ramp

primary

#1B359F

secondary

#C5AE51

accent

#CA3AEE

background

#F7F6FB

surface

#EDEBF7

border

#C8C6D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #1B359F

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

Preview Lab → · Contrast checker → · Palette generator →