Beyond that breadth, its highlights are ready-made offer templates — cross-sell, upsell, service add-ons, and free gifts — collection-wide offers, and a Smart Auto-Upsell mode that uses Shopify's AI to pick the most relevant product for you. The newer slide cart adds built-in offers and a free-shipping rewards bar, and as a Built for Shopify app it brings unlimited upsell revenue with no extra commission and no hit to page speed.

Where Rebuy really delivers is depth: a Smart Cart, AI-powered product recommendations, and customizable search and merchandising rules that work together across the homepage, cart, checkout, and post-purchase. Deep integrations with tools like Klaviyo and Recharge let you tailor the entire journey, and merchants consistently credit it with lifting average order value and conversions.

Its real strength is range — frequently bought together, mix-and-match and volume bundles, BOGO offers, and both AI and manual recommendations, all from one app. A native cart drawer, custom CSS, and multi-currency and multi-language support make it easy to match your storefront, and there is a free plan to start, which is why merchants rate it so highly for value and ease of setup.

The standout is its recommendation engine — frequently bought together, related products, and handpicked picks — paired with upsell placements at the cart, checkout, and post-purchase. Built-in A/B testing and detailed analytics then let you see exactly what is working and fine-tune your offers from there.

Built by Code Black Belt, it is one of the most established recommendation apps on Shopify, using an AI algorithm to surface Amazon-style frequently-bought-together bundles that customers add in a single click. You also get custom and fixed bundle options, Shopify POS compatibility, and multilingual support — all for a flat $9.99/month with no revenue share, backed by more than 2,300 reviews.

It is one of the few apps to cover the entire funnel — product page, cart, and thank-you page — and backs that with genuinely advanced tools: a funnel builder, A/B testing, an AI autopilot that picks the best offer, and even subscription upsells. Best of all, the free plan includes every feature, so you can run a complete upsell stack from a single app.

Its toolkit is broad: product kits, mix-and-match bundles, and BOGO deals, plus PickyCart — a dynamic cart with tiered rewards, free gifts, and discounts — and one-click post-purchase upsells. Everything is no-code with multi-currency and multi-language support, and merchants highlight the quick setup and detailed performance analytics.

Its signature is true one-click upsells — customers accept an offer without re-entering payment details — so both pre- and post-purchase offers convert smoothly. On top of that you get unlimited offers and free upsells through the Shop app, extending your reach at no extra cost.

Designed for fashion and lifestyle stores, it turns curated looks into shoppable lookbooks that customers can add to the cart in one click. Premade, customizable templates keep setup quick and code-free, while bundle upsells with discounts nudge larger orders — which is why merchants give it a perfect 5.0 rating for boosting engagement and order value.

It packs in a full range of placements — Amazon-style bundles, product-page cross-sells, cart funnels, and post-purchase and thank-you-page offers — all through widgets designed to stay unobtrusive. Multi-language and multi-currency support suit international stores, and a real standout is the free setup assistance over Zoom, chat, and email, which helps explain its 1,551 five-star reviews.