Discount Kit

This is such a powerful app. We have some pretty sophisticated dollar-off discounts by product, which includes an array of bundle discounts. I'm impressed with how easy it is to offer customers a simple, single code to accomplish some pretty complex promotions behind the scenes which is not possible with out-of-the-box Shopify. The team is super responsive and always open to suggestions for improvement. They are regularly updating the app with new features, but not overcomplicating it.