Smart upsell recommendations: Fully automated upsell & cross-sell based on API software recommendations. Keep your focus on your market and let the AI app do the upselling. Build successful upselling, cross-selling, and promotion programs to increase sales. Create your own upsales or use one of our predefined ones. The Slick One Click Upsell app provides slick upsells, cross sales, gifts, and related packages through pop-ups. The Upsell is in the cart and One Click is in the cart.