Upsell.com（旧 ReConvert）

I didn't expect this app to make a difference and since it's free for the first 49 orders I thought, "what's there to lose?" Well, let me just say if you're on the fence about this app, install it now. If you don't you're just leaving extra sales on the table. BTW I had a small issue with a product recommendation and Alex figured it out and fixed it for me in less than 5 minutes. Great product with great support.