APO Product Options, Variants

I have always used app to add more variants to my products cause I sell extremely customized items. I have tried a lot of them and then BOOM!
This app is a must have, for those who know what I'm talking about this app is perfectly combined with shopify so the user won't notice any "trouble" due to a third party app conflict, it allow you to use swatches for colors or any other option you have, a tons of conditional logic to improve discounts, promotions and a lot of other strategies to convert. Also it is one of the less expensive even if it is the only professional one at the moment in my opinion. Try it and you will never go back ;-)