#2151A8#2151A8

#2151A8 is a mid, vivid blue. Relative luminance 0.090; OKLCH L 45.4% C 0.150 H 261.1°. Best body text is #FFFFFF at 7.48:1 contrast (WCAG AA passes).

Color values

HEX	#2151A8
RGB	rgb(33, 81, 168)
HSL	hsl(219, 67%, 39%)
HSV	hsv(219, 80%, 66%)
CMYK	cmyk(80.4%, 51.8%, 0%, 34.1%)
CIE-LAB	lab(36.05, 16.58, -51.34)
CIE-LCH	lch(36.05, 53.96, 287.90°)
OKLab	oklab(45.43% -0.0231 -0.1479)
OKLCH	oklch(45.43% 0.15 261.1)
XYZ	xyz(10.6350, 9.0341, 38.2214)
Luminance	0.0903 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#2151A8 #A87821

analogous

#2195A8 #2151A8 #3521A8

triadic

#2151A8 #A82151 #51A821

tetradic

#2151A8 #A82195 #A87821 #21A835

square

#2151A8 #A82195 #A87821 #21A835

split-complementary

#2151A8 #A83521 #95A821

monochromatic

#0D2042 #173875 #2151A8 #306BD6 #6390E0

Accessibility & contrast

On white

7.48

#2151A8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.81

#2151A8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #2151A8

7.48:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##2151A8	#FFFFFF	#000000	##FFFFFF
##2151A8	1.00	7.48	2.81	7.48
#FFFFFF	7.48	1.00	21.00	1.00
#000000	2.81	21.00	1.00	21.00
##FFFFFF	7.48	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#175BAB

Deuteranopia (green-blind)

#004FA6

Tritanopia (blue-blind)

#006674

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #2151a8;
/* rgb */ color: rgb(33, 81, 168);
/* oklch */ color: oklch(45.4% 0.150 261.1);

Tailwind

colors: {
  custom: {
    50: '#7281c2',
    500: '#2151a8',
    950: '#000000',
  },
}

SCSS

$custom: #2151a8;
$custom-light: #7281c2;
$custom-dark: #000000;

JSON

{
  "hex": "#2151a8",
  "rgb": {
    "r": 33,
    "g": 81,
    "b": 168
  },
  "hsl": {
    "h": 218.667,
    "s": 67.164,
    "l": 39.412
  },
  "oklch": {
    "l": 0.45426,
    "c": 0.14965,
    "h": 261.1
  },
  "luminance": 0.09035
}

Semantic roles & 50–950 ramp

primary

#2151A8

secondary

#C5A15F

accent

#AD3EEA

background

#F7F7FC

surface

#EEEEF8

border

#C9C9D1

text

#090A12

muted

#7B7C81

Preview Lab

Preview with #2151A8

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

Preview Lab → · Contrast checker → · Palette generator →