#1B28B3#1B28B3

#1B28B3 is a dark, highly saturated blue. Relative luminance 0.050; OKLCH L 38.8% C 0.212 H 268.0°. Best body text is #FFFFFF at 10.49:1 contrast (WCAG AA passes).

Color values

HEX	#1B28B3
RGB	rgb(27, 40, 179)
HSL	hsl(235, 74%, 40%)
HSV	hsv(235, 85%, 70%)
CMYK	cmyk(84.9%, 77.7%, 0%, 29.8%)
CIE-LAB	lab(26.75, 46.52, -73.16)
CIE-LCH	lch(26.75, 86.70, 302.45°)
OKLab	oklab(38.81% -0.0075 -0.212)
OKLCH	oklch(38.81% 0.212 268)
XYZ	xyz(9.3447, 5.0041, 43.1125)
Luminance	0.0500 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B28B3 #B3A61B

analogous

#1B74B3 #1B28B3 #5A1BB3

triadic

#1B28B3 #B31B28 #28B31B

tetradic

#1B28B3 #B31B74 #B3A61B #1BB35A

square

#1B28B3 #B31B74 #B3A61B #1BB35A

split-complementary

#1B28B3 #B35A1B #74B31B

monochromatic

#0B1049 #131C7E #1B28B3 #2C3BDF #616DE7

Accessibility & contrast

On white

10.49

#1B28B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.00

#1B28B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B28B3

10.49:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B28B3	#FFFFFF	#000000	##FFFFFF
##1B28B3	1.00	10.49	2.00	10.49
#FFFFFF	10.49	1.00	21.00	1.00
#000000	2.00	21.00	1.00	21.00
##FFFFFF	10.49	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0047B7

Deuteranopia (green-blind)

#0037B1

Tritanopia (blue-blind)

#00526D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #1b28b3;
/* rgb */ color: rgb(27, 40, 179);
/* oklch */ color: oklch(38.8% 0.212 268.0);

Tailwind

colors: {
  custom: {
    50: '#7764cb',
    500: '#1b28b3',
    950: '#000000',
  },
}

SCSS

$custom: #1b28b3;
$custom-light: #7764cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1b28b3",
  "rgb": {
    "r": 27,
    "g": 40,
    "b": 179
  },
  "hsl": {
    "h": 234.868,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.38811,
    "c": 0.21216,
    "h": 268
  },
  "luminance": 0.05005
}

Semantic roles & 50–950 ramp

primary

#1B28B3

secondary

#CCC25E

accent

#E137F0

background

#F8F6FC

surface

#EFEBF9

border

#CAC6D2

text

#0B0513

muted

#7C7A82

Preview Lab

Preview with #1B28B3

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

Preview Lab → · Contrast checker → · Palette generator →