#2151B4#2151B4

#2151B4 is a mid, vivid blue. Relative luminance 0.095; OKLCH L 46.4% C 0.166 H 262.4°. Best body text is #FFFFFF at 7.24:1 contrast (WCAG AA passes).

Color values

HEX	#2151B4
RGB	rgb(33, 81, 180)
HSL	hsl(220, 69%, 42%)
HSV	hsv(220, 82%, 71%)
CMYK	cmyk(81.7%, 55%, 0%, 29.4%)
CIE-LAB	lab(36.93, 21.30, -57.03)
CIE-LCH	lch(36.93, 60.88, 290.48°)
OKLab	oklab(46.38% -0.0218 -0.1646)
OKLCH	oklch(46.38% 0.166 262.4)
XYZ	xyz(11.8049, 9.5021, 44.3831)
Luminance	0.0950 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2151B4 #B48421

analogous

#219BB4 #2151B4 #3B21B4

triadic

#2151B4 #B42151 #51B421

tetradic

#2151B4 #B4219B #B48421 #21B43B

square

#2151B4 #B4219B #B48421 #21B43B

split-complementary

#2151B4 #B43B21 #9BB421

monochromatic

#0E224D #183A80 #2151B4 #386DDA #6B93E4

Accessibility & contrast

On white

7.24

#2151B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.90

#2151B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2151B4

7.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2151B4	#FFFFFF	#000000	##FFFFFF
##2151B4	1.00	7.24	2.90	7.24
#FFFFFF	7.24	1.00	21.00	1.00
#000000	2.90	21.00	1.00	21.00
##FFFFFF	7.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005EB7

Deuteranopia (green-blind)

#0050B2

Tritanopia (blue-blind)

#006A7A

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #2151b4;
/* rgb */ color: rgb(33, 81, 180);
/* oklch */ color: oklch(46.4% 0.166 262.4);

Tailwind

colors: {
  custom: {
    50: '#7581cb',
    500: '#2151b4',
    950: '#000000',
  },
}

SCSS

$custom: #2151b4;
$custom-light: #7581cb;
$custom-dark: #000000;

JSON

{
  "hex": "#2151b4",
  "rgb": {
    "r": 33,
    "g": 81,
    "b": 180
  },
  "hsl": {
    "h": 220.408,
    "s": 69.014,
    "l": 41.765
  },
  "oklch": {
    "l": 0.46377,
    "c": 0.16602,
    "h": 262.4
  },
  "luminance": 0.09503
}

Semantic roles & 50–950 ramp

primary

#2151B4

secondary

#CAAA67

accent

#B23CEC

background

#F7F7FC

surface

#EEEEF9

border

#C9C9D2

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #2151B4

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

Preview Lab → · Contrast checker → · Palette generator →