#666FDC

#666FDC

Color Values

HEX

#666FDC

RGB

102, 111, 220

HSL

235.4, 62.8%, 63.1%

HSV

235.4, 53.6%, 86.3%

CMYK

53.6%, 49.5%, 0.0%, 13.7%

OKLCH

0.589 0.1639 276.6

Properties

Cool Light Nearest: royalblue

Color Harmonies

Complementary

#666FDC

#DCD366

Analogous

#66AADC

#9866DC

#666FDC

Triadic

#666FDC

#DC666F

#6FDC66

Split Complementary

#666FDC

#DC9866

#AADC66

Tetradic

#666FDC

#DC66AA

#DCD366

#66DC98

Color Blindness Simulation

Original

#666FDC

Protanopia

#6A6AC2

Deuteranopia

#6969BB

Tritanopia

#66ADA8

Achromatopsia

#757575

CSS Usage

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

Tailwind Shades

50
#F3F4FB
100
#E4E5F7
200
#C5C8F2
300
#9BA1E8
400
#656EDC
500
#2F3CD0
600
#2630A6
700
#1E2685
800
#181E68
900
#15194C
950
#0D1030

Contrast Checker

Text on white

4.31:1

AA Fail AAA Fail

Text on black

4.87:1

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