#666371

#666371

Color Values

HEX

#666371

RGB

102, 99, 113

HSL

252.9, 6.6%, 41.6%

HSV

252.9, 12.4%, 44.3%

CMYK

9.7%, 12.4%, 0.0%, 55.7%

OKLCH

0.5074 0.0222 295.4

Properties

Cool Dark Nearest: RAL 4012 Pearl Blackberry

Color Harmonies

Complementary

#666371

#6E7163

Analogous

#636771

#6D6371

#666371

Triadic

#666371

#716663

#637166

Split Complementary

#666371

#716D63

#677163

Tetradic

#666371

#716367

#6E7163

#63716D

Color Blindness Simulation

Original

#666371

Protanopia

#65656E

Deuteranopia

#65656D

Tritanopia

#666B6A

Achromatopsia

#656565

CSS Usage

background-color: #666371;
color: #666371;
border-color: #666371;
Nearest Tailwind: Zinc 500 #71717A

Tailwind Shades

50
#F7F7F8
100
#EDECEE
200
#DAD9DE
300
#BFBEC6
400
#9D9AA7
500
#7B7788
600
#625F6D
700
#4F4C57
800
#3D3C44
900
#2F2E33
950
#1E1D20

Contrast Checker

Text on white

5.85:1

AA Pass AAA Fail

Text on black

3.59:1

AA Fail AAA Fail

Related Articles

Tutorials

Building a Color Picker Web Component from Scratch

Feb 20, 2026
Tutorials

Web Color Performance: Gradients, Shadows, and Filters

Feb 19, 2026
Tutorials

Tailwind CSS Colors: Complete Shade System Guide

Feb 19, 2026