#646C71

#646C71

Color Values

HEX

#646C71

RGB

100, 108, 113

HSL

203.1, 6.1%, 41.8%

HSV

203.1, 11.5%, 44.3%

CMYK

11.5%, 4.4%, 0.0%, 55.7%

OKLCH

0.5261 0.0126 235.0

Properties

Cool Dark Nearest: dimgrey

Color Harmonies

Complementary

#646C71

#716964

Analogous

#647170

#646671

#646C71

Triadic

#646C71

#71646C

#6C7164

Split Complementary

#646C71

#716466

#717064

Tetradic

#646C71

#706471

#716964

#667164

Color Blindness Simulation

Original

#646C71

Protanopia

#676870

Deuteranopia

#676670

Tritanopia

#646F6F

Achromatopsia

#6B6B6B

CSS Usage

background-color: #646C71;
color: #646C71;
border-color: #646C71;
Nearest Tailwind: Zinc 500 #71717A

Tailwind Shades

50
#F7F7F8
100
#ECEDEE
200
#D9DCDD
300
#BEC3C6
400
#9BA2A6
500
#788187
600
#60676C
700
#4D5357
800
#3C4144
900
#2E3133
950
#1D1F20

Contrast Checker

Text on white

5.35:1

AA Pass AAA Fail

Text on black

3.93:1

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