#1B59B3#1B59B3

#1B59B3 is a mid, vivid blue. Relative luminance 0.106; OKLCH L 47.8% C 0.156 H 258.6°. Best body text is #FFFFFF at 6.72:1 contrast (WCAG AA passes).

Color values

HEX	#1B59B3
RGB	rgb(27, 89, 179)
HSL	hsl(216, 74%, 40%)
HSV	hsv(216, 85%, 70%)
CMYK	cmyk(84.9%, 50.3%, 0%, 29.8%)
CIE-LAB	lab(38.95, 15.07, -53.18)
CIE-LCH	lch(38.95, 55.27, 285.82°)
OKLab	oklab(47.85% -0.0308 -0.1532)
OKLCH	oklch(47.85% 0.156 258.6)
XYZ	xyz(12.1581, 10.6309, 44.0503)
Luminance	0.1063 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B59B3 #B3751B

analogous

#1BA5B3 #1B59B3 #291BB3

triadic

#1B59B3 #B31B59 #59B31B

tetradic

#1B59B3 #B31BA5 #B3751B #1BB329

square

#1B59B3 #B31BA5 #B3751B #1BB329

split-complementary

#1B59B3 #B3291B #A5B31B

monochromatic

#0B2449 #133F7E #1B59B3 #2C75DF #6198E7

Accessibility & contrast

On white

6.72

#1B59B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.13

#1B59B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1B59B3

6.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B59B3	#FFFFFF	#000000	##FFFFFF
##1B59B3	1.00	6.72	3.13	6.72
#FFFFFF	6.72	1.00	21.00	1.00
#000000	3.13	21.00	1.00	21.00
##FFFFFF	6.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2063B6

Deuteranopia (green-blind)

#0055B1

Tritanopia (blue-blind)

#006F7D

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #1b59b3;
/* rgb */ color: rgb(27, 89, 179);
/* oklch */ color: oklch(47.8% 0.156 258.6);

Tailwind

colors: {
  custom: {
    50: '#7387ca',
    500: '#1b59b3',
    950: '#000000',
  },
}

SCSS

$custom: #1b59b3;
$custom-light: #7387ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1b59b3",
  "rgb": {
    "r": 27,
    "g": 89,
    "b": 179
  },
  "hsl": {
    "h": 215.526,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.47847,
    "c": 0.15624,
    "h": 258.6
  },
  "luminance": 0.10632
}

Semantic roles & 50–950 ramp

primary

#1B59B3

secondary

#CC9F5E

accent

#A537F0

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1B59B3

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

Preview Lab → · Contrast checker → · Palette generator →