#51808B

#51808B

Color Values

HEX

#51808B

RGB

81, 128, 139

HSL

191.4, 26.4%, 43.1%

HSV

191.4, 41.7%, 54.5%

CMYK

41.7%, 7.9%, 0.0%, 45.5%

OKLCH

0.5704 0.0538 214.1

Properties

Cool Light Nearest: cadetblue 4

Color Harmonies

Complementary

#51808B

#8B5C51

Analogous

#518B79

#51638B

#51808B

Triadic

#51808B

#8B5180

#808B51

Split Complementary

#51808B

#8B5163

#8B7951

Tetradic

#51808B

#79518B

#8B5C51

#638B51

Color Blindness Simulation

Original

#51808B

Protanopia

#656688

Deuteranopia

#635F88

Tritanopia

#538686

Achromatopsia

#777777

CSS Usage

background-color: #51808B;
color: #51808B;
border-color: #51808B;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F6F8F9
100
#E9F0F1
200
#D2E1E5
300
#B2CCD2
400
#88B0BA
500
#5E94A1
600
#4B7781
700
#3C5F67
800
#2F4A51
900
#25383C
950
#172326

Contrast Checker

Text on white

4.37:1

AA Fail AAA Fail

Text on black

4.81:1

AA Pass AAA Fail

Related Articles

Tutorials

CSS color-mix(): Blend Colors Natively in the Browser

Jan 26, 2026
Tutorials

Building a Color Picker Web Component from Scratch

Jan 21, 2026
Tutorials

Perceptual Color Spaces: Lab, LCH, Oklab, OKLCH

Jan 15, 2026