#646C61

#646C61

Color Values

HEX

#646C61

RGB

100, 108, 97

HSL

103.6, 5.4%, 40.2%

HSV

103.6, 10.2%, 42.4%

CMYK

7.4%, 0.0%, 10.2%, 57.6%

OKLCH

0.521 0.0196 137.1

Properties

Cool Dark Nearest: RAL 7005 Mouse Grey

Color Harmonies

Complementary

#646C61

#69616C

Analogous

#6A6C61

#616C63

#646C61

Triadic

#646C61

#61646C

#6C6164

Split Complementary

#646C61

#63616C

#6C616A

Tetradic

#646C61

#616A6C

#69616C

#6C6361

Color Blindness Simulation

Original

#646C61

Protanopia

#676864

Deuteranopia

#676664

Tritanopia

#646666

Achromatopsia

#6A6A6A

CSS Usage

background-color: #646C61;
color: #646C61;
border-color: #646C61;
Nearest Tailwind: Stone 500 #78716C

Tailwind Shades

50
#F7F8F7
100
#EDEEEC
200
#DADDD9
300
#C0C5BE
400
#9EA69C
500
#7C8679
600
#646C60
700
#50564D
800
#3E433C
900
#2F332E
950
#1E201D

Contrast Checker

Text on white

5.44:1

AA Pass AAA Fail

Text on black

3.86:1

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