UpsellPlus Checkout Upsell

This app is by far the most convenient and user-friendly when it comes to adding a checkout cross-sale.

After struggling with Bold, monk, and other apps, this was the only one with the functionality we needed; the Support was there to help out even on a busy Sunday. (Shoutout to Jaap)

This is how a proper Shopify app is supposed to function. Great work, great support, great product. Keep it up!