SC Product Options

It does the job, but it is the most expensive app I use at $20/mo and still has weird glitches and snafus. Every once in a while all the connections I build just seem to randomly break and I have to rebuild them. Behind the scenes, the use of the hidden products are clunky: they junk up my product list and don't translate well when importing into my shipping program, such as onto customs forms, because they are being imported as a separate product rather than a product variable.

But it was the only working option for conditional logic options (at least at the time I purchased it), and it allows me to increase the options above the Shopify allotment, so I keep working with it. And their customer service is pretty good.