#1B5BB3#1B5BB3

#1B5BB3 is a mid, vivid cyan. Relative luminance 0.110; OKLCH L 48.3% C 0.154 H 257.9°. Best body text is #FFFFFF at 6.57:1 contrast (WCAG AA passes).

Color values

HEX	#1B5BB3
RGB	rgb(27, 91, 179)
HSL	hsl(215, 74%, 40%)
HSV	hsv(215, 85%, 70%)
CMYK	cmyk(84.9%, 49.2%, 0%, 29.8%)
CIE-LAB	lab(39.53, 13.75, -52.25)
CIE-LCH	lch(39.53, 54.03, 284.74°)
OKLab	oklab(48.29% -0.0323 -0.1504)
OKLCH	oklch(48.29% 0.154 257.9)
XYZ	xyz(12.3268, 10.9683, 44.1065)
Luminance	0.1097 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B5BB3 #B3731B

analogous

#1BA7B3 #1B5BB3 #271BB3

triadic

#1B5BB3 #B31B5B #5BB31B

tetradic

#1B5BB3 #B31BA7 #B3731B #1BB327

square

#1B5BB3 #B31BA7 #B3731B #1BB327

split-complementary

#1B5BB3 #B3271B #A7B31B

monochromatic

#0B2549 #13407E #1B5BB3 #2C77DF #619AE7

Accessibility & contrast

On white

6.57

#1B5BB3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.19

#1B5BB3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #1B5BB3

6.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B5BB3	#FFFFFF	#000000	##FFFFFF
##1B5BB3	1.00	6.57	3.19	6.57
#FFFFFF	6.57	1.00	21.00	1.00
#000000	3.19	21.00	1.00	21.00
##FFFFFF	6.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2664B6

Deuteranopia (green-blind)

#0057B1

Tritanopia (blue-blind)

#00707E

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #1b5bb3;
/* rgb */ color: rgb(27, 91, 179);
/* oklch */ color: oklch(48.3% 0.154 257.9);

Tailwind

colors: {
  custom: {
    50: '#7388ca',
    500: '#1b5bb3',
    950: '#000000',
  },
}

SCSS

$custom: #1b5bb3;
$custom-light: #7388ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1b5bb3",
  "rgb": {
    "r": 27,
    "g": 91,
    "b": 179
  },
  "hsl": {
    "h": 214.737,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.48289,
    "c": 0.15382,
    "h": 257.9
  },
  "luminance": 0.1097
}

Semantic roles & 50–950 ramp

primary

#1B5BB3

secondary

#CC9E5E

accent

#A337F0

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0B13

muted

#7C7C82

Preview Lab

Preview with #1B5BB3

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

Preview Lab → · Contrast checker → · Palette generator →