#1B5AB3#1B5AB3

#1B5AB3 is a mid, vivid blue. Relative luminance 0.108; OKLCH L 48.1% C 0.155 H 258.3°. Best body text is #FFFFFF at 6.65:1 contrast (WCAG AA passes).

Color values

HEX	#1B5AB3
RGB	rgb(27, 90, 179)
HSL	hsl(215, 74%, 40%)
HSV	hsv(215, 85%, 70%)
CMYK	cmyk(84.9%, 49.7%, 0%, 29.8%)
CIE-LAB	lab(39.24, 14.41, -52.71)
CIE-LCH	lch(39.24, 54.64, 285.29°)
OKLab	oklab(48.07% -0.0316 -0.1518)
OKLCH	oklch(48.07% 0.155 258.3)
XYZ	xyz(12.2418, 10.7985, 44.0782)
Luminance	0.1080 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B5AB3 #B3741B

analogous

#1BA6B3 #1B5AB3 #281BB3

triadic

#1B5AB3 #B31B5A #5AB31B

tetradic

#1B5AB3 #B31BA6 #B3741B #1BB328

square

#1B5AB3 #B31BA6 #B3741B #1BB328

split-complementary

#1B5AB3 #B3281B #A6B31B

monochromatic

#0B2549 #133F7E #1B5AB3 #2C76DF #6199E7

Accessibility & contrast

On white

6.65

#1B5AB3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.16

#1B5AB3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1B5AB3

6.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B5AB3	#FFFFFF	#000000	##FFFFFF
##1B5AB3	1.00	6.65	3.16	6.65
#FFFFFF	6.65	1.00	21.00	1.00
#000000	3.16	21.00	1.00	21.00
##FFFFFF	6.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2364B6

Deuteranopia (green-blind)

#0056B1

Tritanopia (blue-blind)

#00707E

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #1b5ab3;
/* rgb */ color: rgb(27, 90, 179);
/* oklch */ color: oklch(48.1% 0.155 258.3);

Tailwind

colors: {
  custom: {
    50: '#7387ca',
    500: '#1b5ab3',
    950: '#000000',
  },
}

SCSS

$custom: #1b5ab3;
$custom-light: #7387ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1b5ab3",
  "rgb": {
    "r": 27,
    "g": 90,
    "b": 179
  },
  "hsl": {
    "h": 215.132,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.48067,
    "c": 0.15503,
    "h": 258.3
  },
  "luminance": 0.108
}

Semantic roles & 50–950 ramp

primary

#1B5AB3

secondary

#CC9E5E

accent

#A437F0

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1B5AB3

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

Preview Lab → · Contrast checker → · Palette generator →