#2155B3#2155B3

#2155B3 is a mid, vivid blue. Relative luminance 0.101; OKLCH L 47.1% C 0.160 H 261.1°. Best body text is #FFFFFF at 6.97:1 contrast (WCAG AA passes).

Color values

HEX	#2155B3
RGB	rgb(33, 85, 179)
HSL	hsl(219, 69%, 42%)
HSV	hsv(219, 82%, 70%)
CMYK	cmyk(81.6%, 52.5%, 0%, 29.8%)
CIE-LAB	lab(37.97, 18.25, -54.75)
CIE-LCH	lch(37.97, 57.71, 288.44°)
OKLab	oklab(47.15% -0.0247 -0.1578)
OKLCH	oklch(47.15% 0.16 261.1)
XYZ	xyz(12.0094, 10.0736, 43.9505)
Luminance	0.1008 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2155B3 #B37F21

analogous

#219EB3 #2155B3 #3621B3

triadic

#2155B3 #B32155 #55B321

tetradic

#2155B3 #B3219E #B37F21 #21B336

square

#2155B3 #B3219E #B37F21 #21B336

split-complementary

#2155B3 #B33621 #9EB321

monochromatic

#0E244C #173C7F #2155B3 #3771DA #6B96E4

Accessibility & contrast

On white

6.97

#2155B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.01

#2155B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #2155B3

6.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2155B3	#FFFFFF	#000000	##FFFFFF
##2155B3	1.00	6.97	3.01	6.97
#FFFFFF	6.97	1.00	21.00	1.00
#000000	3.01	21.00	1.00	21.00
##FFFFFF	6.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1160B6

Deuteranopia (green-blind)

#0053B1

Tritanopia (blue-blind)

#006C7C

Achromatopsia (no color)

#595959

Design tokens & code

CSS

--color: #2155b3;
/* rgb */ color: rgb(33, 85, 179);
/* oklch */ color: oklch(47.1% 0.160 261.1);

Tailwind

colors: {
  custom: {
    50: '#7584ca',
    500: '#2155b3',
    950: '#000000',
  },
}

SCSS

$custom: #2155b3;
$custom-light: #7584ca;
$custom-dark: #000000;

JSON

{
  "hex": "#2155b3",
  "rgb": {
    "r": 33,
    "g": 85,
    "b": 179
  },
  "hsl": {
    "h": 218.63,
    "s": 68.868,
    "l": 41.569
  },
  "oklch": {
    "l": 0.47145,
    "c": 0.15972,
    "h": 261.1
  },
  "luminance": 0.10075
}

Semantic roles & 50–950 ramp

primary

#2155B3

secondary

#CAA666

accent

#AD3CEC

background

#F7F8FC

surface

#EEEFF8

border

#C9CAD1

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #2155B3

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

Preview Lab → · Contrast checker → · Palette generator →