#51638B

#51638B

Color Values

HEX

#51638B

RGB

81, 99, 139

HSL

221.4, 26.4%, 43.1%

HSV

221.4, 41.7%, 54.5%

CMYK

41.7%, 28.8%, 0.0%, 45.5%

OKLCH

0.5018 0.0679 265.4

Properties

Cool Dark Nearest: RAL 5023 Distant Blue

Color Harmonies

Complementary

#51638B

#8B7951

Analogous

#51808B

#5C518B

#51638B

Triadic

#51638B

#8B5163

#638B51

Split Complementary

#51638B

#8B5C51

#808B51

Tetradic

#51638B

#8B5180

#8B7951

#518B5C

Color Blindness Simulation

Original

#51638B

Protanopia

#595981

Deuteranopia

#58567F

Tritanopia

#527A78

Achromatopsia

#626262

CSS Usage

background-color: #51638B;
color: #51638B;
border-color: #51638B;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F6F7F9
100
#E9ECF1
200
#D2D8E5
300
#B2BCD2
400
#8897BA
500
#5E73A1
600
#4B5C81
700
#3C4967
800
#2F3951
900
#252C3C
950
#171C26

Contrast Checker

Text on white

5.99:1

AA Pass AAA Fail

Text on black

3.51:1

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