Best free Upsell and cross-sell Shopify apps in 2026 [Updated]

The best free Shopify upsell and cross-sell apps help merchants increase average order value (AOV) through smart product recommendations and one-click offers. From AI-powered suggestions to post-purchase upsells, checkout add-ons, and frequently bought together bundles, these apps seamlessly integrate into your store to encourage larger purchases. Whether you need cart upsells, thank you page offers, or automated product recommendations, these free tools make it simple to implement proven sales strategies without upfront costs.