#666D8D

#666D8D

Color Values

HEX

#666D8D

RGB

102, 109, 141

HSL

229.2, 16.0%, 47.6%

HSV

229.2, 27.7%, 55.3%

CMYK

27.7%, 22.7%, 0.0%, 44.7%

OKLCH

0.5411 0.0508 275.0

Properties

Cool Dark Nearest: RAL 5014 Pigeon Blue

Color Harmonies

Complementary

#666D8D

#8D8666

Analogous

#66808D

#72668D

#666D8D

Triadic

#666D8D

#8D666D

#6D8D66

Split Complementary

#666D8D

#8D7266

#808D66

Tetradic

#666D8D

#8D6680

#8D8666

#668D72

Color Blindness Simulation

Original

#666D8D

Protanopia

#696985

Deuteranopia

#696883

Tritanopia

#667F7E

Achromatopsia

#6E6E6E

CSS Usage

background-color: #666D8D;
color: #666D8D;
border-color: #666D8D;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F6F7F8
100
#EBECF0
200
#D6D8E1
300
#B8BCCC
400
#9297B0
500
#6B7294
600
#565C76
700
#45495F
800
#36394A
900
#292C37
950
#1A1C23

Contrast Checker

Text on white

5.08:1

AA Pass AAA Fail

Text on black

4.14:1

AA Fail AAA Fail

Related Articles

Tutorials

CSS color-mix(): Blend Colors Natively in the Browser

Jan 26, 2026
Tutorials

Building a Color Picker Web Component from Scratch

Jan 21, 2026
Tutorials

Perceptual Color Spaces: Lab, LCH, Oklab, OKLCH

Jan 15, 2026