Checkout is the highest-intent moment in the entire shopping journey, which makes it one of the best places to grow average order value (AOV). The right checkout upsell app adds one-click offers, cross-sells, and post-purchase deals that lift revenue without hurting conversion. This guide ranks the 11 best Shopify checkout upsell apps for 2026, based on features, pricing, ratings, and real merchant feedback.
One important note before you start: in-checkout upsells rely on Shopify's checkout extensibility, and customizing the checkout page itself is available only on the Shopify Plus plan. Stores on other plans can still run post-purchase and thank-you-page upsells, but offers shown directly on the checkout steps require Shopify Plus.
Our top pick, Checkout Components, goes well beyond upsells: it personalizes the entire checkout by customer segment with content blocks, A/B testing, and deep analytics, though it requires Shopify Plus to install. We placed Candy Rack at #2 because it pairs an excellent all-in-one upsell suite across the product page, cart, checkout, and post-purchase with more accessible pricing, making it the best value for most stores. (Full disclosure: Candy Rack is built by our team at Digismoothie.)
