The best Shopify upsell app depends on where you want the offer to appear. Rebuy is the all-in-one choice for larger stores that want cart, checkout and post-purchase upsells in one platform. Smaller stores usually do better with a focused app such as UpCart for the cart drawer or AfterSell, ReConvert or Zipify OCU for one-click post-purchase offers.
Before you pick a tool, it helps to know what the tests show. In our database, the product you offer and where you place it change results far more than which app shows it. Below we cover each type of app, what it costs as of November 2026, and the real A/B tests behind each placement.
| App | Best for | Placements | Starting price (as of November 2026) | Not for |
|---|---|---|---|---|
| Rebuy | Growing and high-volume brands that want one platform | Product page, smart cart, checkout (Plus), post-purchase, thank-you page | From $25/month per package; free Monetize plan (pricing) | New stores with low order volume and simple catalogs |
| UpCart | Stores that want a better cart drawer with upsells | Cart drawer | $29.99/month up to 200 orders (listing) | Stores that need post-purchase or checkout offers |
| AfterSell | One-click post-purchase and thank-you page offers | Post-purchase, thank-you page, checkout (Plus), cart on higher plans | $34.99/month (listing) | Stores that only want a free starter tool |
| ReConvert | Small stores testing post-purchase on a budget | Post-purchase, thank-you page, product page, cart, checkout | Free up to 50 orders; paid from $9.99/month (listing) | High-volume brands that want deep personalization |
| Zipify OCU | Stores that want pricing tied to upsell revenue | Product page, pre-purchase, slide cart, checkout (Plus), thank-you page | $9.95/month up to $200 upsell revenue (listing) | Stores whose catalog changes often and needs dynamic offers |
| Shopify Search & Discovery | Free complementary-product blocks on the product page | Product page (theme sections) | Free (Shopify Help) | Anyone who wants cart, checkout or post-purchase offers |
We have not used these apps ourselves. The notes below come from vendor documentation, pricing pages and Shopify App Store listings.
Rebuy: the all-in-one upsell platform
Rebuy covers almost every upsell spot in a Shopify store. Its site lists a Smart Cart with progress bars and gift-with-purchase offers, product page widgets, dynamic bundles, checkout extensions for Shopify Plus, post-purchase offers, smart search, and built-in A/B testing.
Pricing is modular. As of November 2026, the Rebuy pricing page lists a free Monetize plan for post-purchase ad offers. It also lists a "Build Your Own" plan from $25/month per package, priced by monthly order count, and a custom-priced Platform One plan. There are four packages: Cart & Merchandising, Checkout & Post-Purchase, Search & Collections, and Flows & A/B Testing. Bundles are discounted 10% to 30%, and the "Build Your Own" plan comes with a 14-day trial.
Real downsides. The cost grows with both order volume and the number of packages you add. Premium support is a $499/month add-on. When we checked in November 2026, Rebuy's Shopify App Store listing said the app is "not currently available on the Shopify App Store", so you would go through Rebuy's own site to get started. Confirm how installation and billing work with Rebuy before you commit.
Who it is not for: a new store with a handful of products and a few hundred orders a month. A single-purpose cart or post-purchase app will cost less and do the job.
Tools mentioned here
You only need one A/B testing tool to copy this result. Here's where we'd start.
Some of these are affiliate links. We only list tools practitioners actually use to run tests like these.
Cart drawer upsell apps
The cart drawer is where most of our cart upsell tests ran, and it is where the biggest wins in our database showed up. If you only add one upsell, the cart is a strong place to start. Our cart drawer guide covers the layout side.
UpCart (now owned by Rokt) is a slide-cart builder with in-cart upsells, "frequently bought together" blocks, free-shipping progress bars, tiered rewards and one-click add-ons. As of November 2026, its App Store listing shows $29.99/month for up to 200 orders, $34.99/month for up to 500, and $54.99/month for up to 1,000, each with a 14-day trial. It is rated 4.8 from 955 reviews. The downside is that the price grows with orders, and it only handles the cart.
Rebuy's Smart Cart does the same job inside the larger Rebuy platform. AfterSell's Pre-Purchase and Complete plans also add an AI cart with 18+ blocks, according to its listing.
What the tests say about cart upsells:
- Oliver Kenyon added small arrows to the cart upsells and a delivery window line, and the store gained +$127,867/month.
- Milos tested a leather strap against a mystery box as the cart drawer upsell and saw +15.26% revenue per visitor and +18.19% conversion rate, even though AOV moved -2.48%.
- Oliver Kenyon added a "Buying for someone else?" gift wrap upsell inside the cart after surveys showed customers could not find the option. The result was +$58,860/month.
- Not every cart upsell helps. Oliver Kenyon removed a $25 pre-checkout upsell that was out of step with a $300 AOV, redesigned the slide cart and added trust elements. The store gained +$31,000/month.
Dave Diederen's test of skipping the cart entirely shows why the cart matters. Sending shoppers straight to checkout cut conversion rate by 10.23% and revenue per visitor by 6.58%. Dave's explanation was that the cart is where upsells, shipping progress bars and trust signals do their work.
Checkout upsells
Checkout upsells depend on your Shopify plan. Shopify's developer docs state that "checkout UI extensions for the information, shipping, and payment steps are available only to stores on a Shopify Plus plan." The docs list no plan restriction for the thank-you and order status pages.
So on a standard plan, you cannot add an offer block inside the checkout steps. Your options are the cart, the post-purchase page and the thank-you page. On Plus, Rebuy, AfterSell and Zipify OCU all list checkout upsells.
Kasper Dolk has shared several Plus checkout results:
- A checkbox upsell in the Shopify Plus checkout was taken by 50% of orders for fashion clients.
- A custom-coded AOV order bump saw a 15-20% take rate on other stores, which Kasper estimates at an extra $100-200k in profit.
- One Plus client credited checkout blocks with USPs, reviews and a checkout upsell with over $400K extra revenue per month. This was a before-and-after comparison, not a split test, so treat it as a lead to test rather than proof.
Take rate is not the same as profit. A 50% take rate on a low-cost add-on can be worth less than a 15% take rate on a larger item. Judge it on revenue or profit per visitor.
Want results like this on your store?
Kasper Dolk at Maison Commerce. Kasper runs Maison Commerce, which builds CRO programs, landing pages and themes for fast-growing ecommerce brands such as ICON and HiStrips.
Post-purchase upsells (one-click upsells)
A post-purchase upsell appears after the shopper pays but before the thank-you page. A one-click upsell lets them add the item without re-entering payment details. It cannot lose you the first order, which is why most stores find it a low-risk place to start. We compare these apps in more depth on our post-purchase upsell apps page.
Shopify's post-purchase extension docs note that only Plus merchants can install custom apps that use post-purchase extensions. Apps from the Shopify App Store are available to all merchants, so the apps below work on any plan.
AfterSell (by Rokt) focuses on one-click post-purchase offers, downsell funnels and thank-you page upsells. As of November 2026, its listing shows Post-Purchase at $34.99/month, Pre-Purchase at $59.99/month and Complete at $79.99/month, each with a 30-day trial. It is rated 4.9 from 1,112 reviews. There is no free plan for live stores.
ReConvert (now branded Upsell.com) is the budget option. Its listing shows a free plan up to 50 orders or $50 in upsell revenue, then $9.99/month for 51-100 orders, $19.99/month for 101-200 and $39.99/month for 201-500. It is rated 4.8 from 3,126 reviews. Costs climb as order volume grows, so check the higher tiers before you scale.
Zipify OCU charges by upsell revenue instead of orders. As of November 2026, its listing shows $9.95/month up to $200 in upsell revenue, $25/month for $200-$2,500, and $149/month above that, with a 30-day trial. It is rated 4.5 from 573 reviews, and some reviewers say its dynamic and AI recommendations are limited.
Dave Diederen added a 1-click complementary post-purchase upsell for a client. The offer converted at 16.64%, with $16.50 per accepted offer. Dave's advice was to offer the natural next product, such as the moisturizer that goes with a face serum.
Want results like this on your store?
Dave Diederen at Syntra Labs. Dave builds and tests Shopify stores at Syntra Labs, and shares most results in public.
What the tests say about upsell placement
Across our cart upsell tests and checkout and product page upsell tests, a few patterns stand out.
Upsells work, but the lift can be small
Kasper Dolk ran a large upsells vs no upsells test with about 398.6k visitors per arm. Revenue per visitor rose 1.86%, from $1.46 to $1.49, while AOV stayed flat. Kasper estimated the gain at +$26,471/month. It was a real win, but a modest one, and Kasper judged it on profit per visitor with significance.
The product matters more than the app
Dave Diederen tested two different upsell products in the same product page add-to-cart popup, with nothing else changed. The winner lifted revenue per visitor by 7.80% and conversion rate by 4.37%. Milos's leather strap vs mystery box test points the same way.
Complementary items beat random ones
Alex Stoykov added a one-click "Frequently Bought Together" bundle of tape and solvent next to a golf grip, because installing a grip needs both. Over 16 days and 12,421 visitors, revenue per visitor rose 10.87% and conversion rate rose 8.09%.
Size the offer to the order
Oliver Kenyon's slide cart test removed a $25 upsell on a $300 AOV store and still gained revenue. An offer that feels out of place can cause friction instead of adding to the order.
The practical takeaway: pick the app that covers the placement you want to test, then test the offer itself. Most of these apps include A/B testing. For strategy, read our guides to upselling and upsell design.
Questions
What is the best upsell app for Shopify?
It depends on placement and size. Rebuy covers cart, checkout and post-purchase in one platform for larger brands. UpCart suits stores that want a better cart drawer, and AfterSell, ReConvert or Zipify OCU suit stores that want one-click post-purchase offers.
What is a one-click upsell on Shopify?
It is an offer shown after payment but before the thank-you page. The shopper can add the item without re-entering card details. App Store apps such as AfterSell, ReConvert and Zipify OCU offer it on all Shopify plans.
Do I need Shopify Plus for checkout upsells?
For offers inside the information, shipping and payment steps, yes. Shopify limits those checkout UI extensions to Plus stores. Cart, post-purchase and thank-you page upsells work on other plans.
Is there a free Shopify upsell app?
Shopify's free Search & Discovery app lets you set complementary products on product pages if your theme supports it. ReConvert has a free plan up to 50 orders, and Rebuy has a free Monetize plan for post-purchase ad offers.
Do upsells actually increase revenue?
Usually, but by less than many people expect. In Kasper Dolk's test with about 398.6k visitors per arm, adding upsells raised revenue per visitor by 1.86%. Bigger wins in our database came from choosing a better-fitting product or placement.
Sources
- www.rebuyengine.com/pricing
- www.rebuyengine.com/
- apps.shopify.com/rebuy
- apps.shopify.com/upcart-cart-builder
- apps.shopify.com/aftersell
- apps.shopify.com/reconvert-upsell-cross-sell
- apps.shopify.com/zipify-oneclickupsell
- shopify.dev/docs/api/checkout-ui-extensions
- shopify.dev/docs/apps/build/checkout/product-offers/build-a-post-purchase-offer
- help.shopify.com/en/manual/online-store/search-and-discovery/product-recommendations