#66657F

#66657F

Color Values

HEX

#66657F

RGB

102, 101, 127

HSL

242.3, 11.4%, 44.7%

HSV

242.3, 20.5%, 49.8%

CMYK

19.7%, 20.5%, 0.0%, 50.2%

OKLCH

0.5174 0.0408 286.6

Properties

Cool Dark Nearest: RAL 5014 Pigeon Blue

Color Harmonies

Complementary

#66657F

#7E7F65

Analogous

#65717F

#73657F

#66657F

Triadic

#66657F

#7F6665

#657F66

Split Complementary

#66657F

#7F7365

#717F65

Tetradic

#66657F

#7F6571

#7E7F65

#657F73

Color Blindness Simulation

Original

#66657F

Protanopia

#666679

Deuteranopia

#666677

Tritanopia

#667473

Achromatopsia

#676767

CSS Usage

background-color: #66657F;
color: #66657F;
border-color: #66657F;
Nearest Tailwind: Slate 500 #64748B

Tailwind Shades

50
#F7F7F8
100
#ECEBEF
200
#D8D7DF
300
#BBBBC9
400
#9796AB
500
#72718E
600
#5B5A72
700
#49485B
800
#393847
900
#2C2B35
950
#1C1B22

Contrast Checker

Text on white

5.63:1

AA Pass AAA Fail

Text on black

3.73:1

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