#66636F

#66636F

Color Values

HEX

#66636F

RGB

102, 99, 111

HSL

255.0, 5.7%, 41.2%

HSV

255.0, 10.8%, 43.5%

CMYK

8.1%, 10.8%, 0.0%, 56.5%

OKLCH

0.5066 0.0191 297.2

Properties

Cool Dark Nearest: RAL 4012 Pearl Blackberry

Color Harmonies

Complementary

#66636F

#6C6F63

Analogous

#63666F

#6C636F

#66636F

Triadic

#66636F

#6F6663

#636F66

Split Complementary

#66636F

#6F6C63

#666F63

Tetradic

#66636F

#6F6366

#6C6F63

#636F6C

Color Blindness Simulation

Original

#66636F

Protanopia

#65656C

Deuteranopia

#65656B

Tritanopia

#666A69

Achromatopsia

#656565

CSS Usage

background-color: #66636F;
color: #66636F;
border-color: #66636F;
Nearest Tailwind: Zinc 500 #71717A

Tailwind Shades

50
#F7F7F8
100
#EDECEE
200
#DAD9DD
300
#C0BEC5
400
#9E9BA6
500
#7C7887
600
#63606C
700
#4F4D56
800
#3E3C43
900
#2F2E33
950
#1E1D20

Contrast Checker

Text on white

5.87:1

AA Pass AAA Fail

Text on black

3.58:1

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