#646B8B

#646B8B

Color Values

HEX

#646B8B

RGB

100, 107, 139

HSL

229.2, 16.3%, 46.9%

HSV

229.2, 28.1%, 54.5%

CMYK

28.1%, 23.0%, 0.0%, 45.5%

OKLCH

0.5342 0.051 275.0

Properties

Cool Dark Nearest: RAL 5014 Pigeon Blue

Color Harmonies

Complementary

#646B8B

#8B8464

Analogous

#647F8B

#71648B

#646B8B

Triadic

#646B8B

#8B646B

#6B8B64

Split Complementary

#646B8B

#8B7164

#7F8B64

Tetradic

#646B8B

#8B647F

#8B8464

#648B71

Color Blindness Simulation

Original

#646B8B

Protanopia

#676783

Deuteranopia

#676681

Tritanopia

#647D7C

Achromatopsia

#6C6C6C

CSS Usage

background-color: #646B8B;
color: #646B8B;
border-color: #646B8B;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F6F7F8
100
#EBECF0
200
#D5D8E1
300
#B8BBCC
400
#9197B0
500
#6B7294
600
#555B77
700
#44495F
800
#35394A
900
#292C38
950
#1A1C23

Contrast Checker

Text on white

5.23:1

AA Pass AAA Fail

Text on black

4.02:1

AA Fail AAA Fail

Related Articles

Tutorials

Responsive Color: Adapting Colors for Different Screens

Jan 23, 2026
Tutorials

Color for Data Storytelling: Beyond Default Chart Colors

Jan 21, 2026
Tutorials

How to Choose Brand Colors: A Step-by-Step Guide

Jan 18, 2026