#666C9C

#666C9C

Color Values

HEX

#666C9C

RGB

102, 108, 156

HSL

233.3, 21.4%, 50.6%

HSV

233.3, 34.6%, 61.2%

CMYK

34.6%, 30.8%, 0.0%, 38.8%

OKLCH

0.5459 0.0752 278.1

Properties

Cool Dark Nearest: RAL 4011 Pearl Violet

Color Harmonies

Complementary

#666C9C

#9C9666

Analogous

#66879C

#7B669C

#666C9C

Triadic

#666C9C

#9C666C

#6C9C66

Split Complementary

#666C9C

#9C7B66

#879C66

Tetradic

#666C9C

#9C6687

#9C9666

#669C7B

Color Blindness Simulation

Original

#666C9C

Protanopia

#696990

Deuteranopia

#68688E

Tritanopia

#668785

Achromatopsia

#6E6E6E

CSS Usage

background-color: #666C9C;
color: #666C9C;
border-color: #666C9C;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F6F6F9
100
#EAEBF0
200
#D4D5E3
300
#B5B8CF
400
#8C91B5
500
#646A9B
600
#50557C
700
#404463
800
#32354D
900
#27293A
950
#191A24

Contrast Checker

Text on white

5.01:1

AA Pass AAA Fail

Text on black

4.19:1

AA Fail AAA Fail

Related Articles

Color Questions

What Is Pantone? The Universal Color Language

Feb 20, 2026
Color Questions

What Is Metamerism? Why Colors Look Different Under Different Lights

Feb 20, 2026
Color Questions

What Is Luminance? Brightness in Color Science

Feb 20, 2026