#666F8C

#666F8C

Color Values

HEX

#666F8C

RGB

102, 111, 140

HSL

225.8, 15.7%, 47.5%

HSV

225.8, 27.1%, 54.9%

CMYK

27.1%, 20.7%, 0.0%, 45.1%

OKLCH

0.5451 0.0467 271.3

Properties

Cool Dark Nearest: RAL 5014 Pigeon Blue

Color Harmonies

Complementary

#666F8C

#8C8366

Analogous

#66828C

#70668C

#666F8C

Triadic

#666F8C

#8C666F

#6F8C66

Split Complementary

#666F8C

#8C7066

#828C66

Tetradic

#666F8C

#8C6682

#8C8366

#668C70

Color Blindness Simulation

Original

#666F8C

Protanopia

#6A6A85

Deuteranopia

#696983

Tritanopia

#667F7E

Achromatopsia

#6F6F6F

CSS Usage

background-color: #666F8C;
color: #666F8C;
border-color: #666F8C;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F6F7F8
100
#EBECF0
200
#D6D8E1
300
#B8BDCB
400
#9299AF
500
#6B7594
600
#565E76
700
#454B5E
800
#363A4A
900
#2A2D37
950
#1A1C23

Contrast Checker

Text on white

4.98:1

AA Pass AAA Fail

Text on black

4.22:1

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