Rebuy does everything. Except, maybe, your bundles.

Short version: Rebuy (on the App Store since 2019, 4.7 stars across roughly 850 reviews) is an AI personalization engine: upsells, cross-sells, smart cart, search, post-purchase flows, A/B testing. Stores that use it well make real money with it. Bundles appear in that list as one offer type among many, and that is precisely the issue this page is about. A platform whose center of gravity is recommendation quality treats the bundle's afterlife, in the cart line, the pick list, and the ERP export, as someone else's problem. For operations-heavy stores it becomes your problem. Solving it is our entire product: bundles serious operations can trust.

What Rebuy is genuinely good at

Personalization breadth and intelligence: data-driven upsells and cross-sells across product page, cart, checkout and post-purchase, smart search and merchandising, rules plus AI, A/B testing, and integrations across the modern Shopify stack. If your goal is squeezing more revenue from every session with one connected suite, Rebuy is one of the category's serious answers, and nothing below argues otherwise.

The slice a suite does not center

Ask three narrow questions about kits, on any suite. Does the cart and checkout show the shopper exactly what is inside the kit, per line? Does the order your 3PL imports contain real component SKUs it can pick without a translation table? Do the order lines carry original prices with the discount allocated per line, so an ERP or accountant can reconcile them against your price list? These are not personalization questions, so platforms rarely lead with the answers. Get them empirically: place a test order and read it. The five-minute test works on any app.

Solid Bundles answers all three structurally. Kits expand during checkout, through Shopify's native Cart Transform, into real component SKUs at original prices with per-line discount allocation. The storefront widget lists every component, with the shopper's chosen variant, right in the cart line properties. And the app never writes to your inventory: availability is computed live from component stock, verified in every market on demand and again every night.

Keep the suite, fix the kits

The usually-right answer is not either-or. If Rebuy earns its keep on recommendations, keep it there and let a dedicated kit app own the bundle products; the two layers do not compete. The one rule of coexistence: do not point two product discounts at the same line item, because Shopify applies one and shoppers see the difference at checkout. Kits defined in Solid Bundles carry their own pricing, so the clean split is: Rebuy decides what to offer next, Solid Bundles defines what a kit is and what lands in the order.

If, on the other hand, bundles were the main reason you pay for Rebuy, compare the bills below and draw the obvious conclusion.

Pricing, honestly

LAST VERIFIED: SEPTEMBER 4, 2026, FROM BOTH PUBLIC APP STORE LISTINGS

Who should do what

• Keep Rebuy alone if bundles are a minor offer type for you and the order shape has never caused a support ticket. Do not add apps you do not need.
• Run Solid Bundles beside Rebuy if the personalization earns its keep but your kits misbehave downstream: contents invisible in the cart, opaque lines at the 3PL, unreconcilable exports.
• Replace the bundle slice if kits were the main thing you used Rebuy for. $29 flat against a volume-scaled suite bill is not a subtle comparison.

What is Solid Bundles?

Solid Bundles is Crescano's Shopify app for fixed bundles, kits and quantity breaks, built on Shopify's Cart Transform API. Real component SKUs land in every order by construction, the app never writes to your inventory, and verification re-runs every night in every market. Flat $29 per month at any volume. The setup guide, 3PL guide, and troubleshooting docs are public.

Choosing a dedicated bundle app instead? Start with the two architectures or the Simple Bundles comparison. Comparing costs? See what bundle apps actually cost at your volume.