#666BCB

#666BCB

Color Values

HEX

#666BCB

RGB

102, 107, 203

HSL

237.0, 49.3%, 59.8%

HSV

237.0, 49.8%, 79.6%

CMYK

49.8%, 47.3%, 0.0%, 20.4%

OKLCH

0.5703 0.1456 278.5

Properties

Cool Dark Nearest: NCS S 1050-R90B Blue Violet

Color Harmonies

Complementary

#666BCB

#CBC666

Analogous

#669ECB

#9366CB

#666BCB

Triadic

#666BCB

#CB666B

#6BCB66

Split Complementary

#666BCB

#CB9366

#9ECB66

Tetradic

#666BCB

#CB669E

#CBC666

#66CB93

Color Blindness Simulation

Original

#666BCB

Protanopia

#6868B4

Deuteranopia

#6868AE

Tritanopia

#66A19D

Achromatopsia

#717171

CSS Usage

background-color: #666BCB;
color: #666BCB;
border-color: #666BCB;
Nearest Tailwind: Indigo 400 #818CF8

Tailwind Shades

50
#F4F4FB
100
#E6E6F5
200
#CACBED
300
#A4A7E0
400
#7277CF
500
#4147BE
600
#343998
700
#292D7A
800
#20235F
900
#1B1D46
950
#11122C

Contrast Checker

Text on white

4.64:1

AA Pass AAA Fail

Text on black

4.53:1

AA Pass 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