#51738B

#51738B

Color Values

HEX

#51738B

RGB

81, 115, 139

HSL

204.8, 26.4%, 43.1%

HSV

204.8, 41.7%, 54.5%

CMYK

41.7%, 17.3%, 0.0%, 45.5%

OKLCH

0.5391 0.0542 239.8

Properties

Cool Dark Nearest: skyblue 4

Color Harmonies

Complementary

#51738B

#8B6951

Analogous

#518B86

#51568B

#51738B

Triadic

#51738B

#8B5173

#738B51

Split Complementary

#51738B

#8B5156

#8B8651

Tetradic

#51738B

#86518B

#8B6951

#568B51

Color Blindness Simulation

Original

#51738B

Protanopia

#606085

Deuteranopia

#5E5B84

Tritanopia

#538180

Achromatopsia

#6E6E6E

CSS Usage

background-color: #51738B;
color: #51738B;
border-color: #51738B;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F6F8F9
100
#E9EEF1
200
#D2DDE5
300
#B2C5D2
400
#88A5BA
500
#5E85A1
600
#4B6B81
700
#3C5567
800
#2F4351
900
#25323C
950
#172026

Contrast Checker

Text on white

5.03:1

AA Pass AAA Fail

Text on black

4.17:1

AA Fail 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