Color Swatch King: Variants

At this point this is the best app with swatches functionality. I've had some difficulties with setting it up (for example: swatches not showing up at collection page), but with such great and client-oriented support team these difficulties were gone. Interface of the app is user-friendly, but sometimes not completely intuitively understandable. I just needed some time and couple of support tickets sent to the chat to figure it all out. Overall I'm having very good experience with this app