Smart upsell recommendations based on API software recommendations: Fully automated upsell and cross sale. Let the AI app handle the upselling while you concentrate on your market. Build successful upselling, cross-selling, and promotion programs to increase sales. Create your own upsales or use one of our predefined ones. Slick One Click Upsell app: Slick upsell, cross-sale, gifts & related package packages are offered through popups. The Upsell is in the cart and One Click is in the cart.