OP Color Swatch Variant Images

Came searching for an app to group products together, and found OPTIS. Not only does it group products, but it also provides multiple options for variant selection display, ability to display variants on collection pages, a very intuitive configuration and setup UI, and remarkably responsive support through their built-in chat.

One thing I'd like to see added - they currently rely on Shopify's default variant availability. I.E. - size can be marked as unavailable for a particular color, but it doesn't reciprocate to show unavailable colors for a given size.

Given how responsive they've been to-date, I have confidence they'll address this very soon.