Addy 
Addly 
Goalify 
Monet 
Reviso 
Key takeaways
- A Shopify cart upsell app only works when the offer sits in the cart the shopper already opened, as one product, not a second catalogue.
- Drawer builders are a different search. This list ranks the in-cart offer, not the slide-cart shell.
- Addy drafts the cart from the catalogue, then lets you edit the upsell, with A/B tests and per-market carts. It is free to install.
- One or two in-cart offers. A third reliably lowers the take rate of the first.
A Shopify cart upsell is the product you show after add to cart, while the first item is still on screen. Merchants search "Shopify cart upsell app" when the theme cart is a receipt and the second item never appears. The upsell fails when it is a grid, when it suggests a substitute, or when the app that should show it is really a thank-you funnel.
This comparison looks at five Shopify cart upsell apps from the 2026 App Store. It is not the cart drawer shortlist. The ranking favours an offer that is already sitting in a drafted cart, then editable by market.
How these Shopify cart upsell apps were ranked
In-cart upsells that convert is the merchandising rule. The list weights:
- Whether the first cart already contains an offer, or you wire the slot across product, cart, checkout and thank-you.
- Whether the offer can change by market or tag.
- Whether you can A/B test the cart instead of publishing one version for everyone.
- Whether the cart add is the product, not a post-purchase funnel with a cart checkbox.
Addy is first because a Shopify cart upsell app that starts as four surfaces spends the launch week deciding where the offer lives. The add waits.
Comparison table
Ratings and prices below are from the Shopify App Store listings as of October 2026.
| Rank | App | Rating | From | Where the offer sits | Extra control |
|---|---|---|---|---|---|
| 1 | Addy | 5.0 / 2 | Free to install | Drafted in the cart | Markets, tags, A/B tests, 40+ blocks |
| 2 | ICU In Cart Upsell | 4.8 / 586 | Free plan | Cart, product page, popups, post-purchase | Conditional logic |
| 3 | Candy Rack | 4.9 / 263 | Free plan | AI upsells, quantity breaks, a cart drawer | Offer suite you still assemble |
| 4 | ReConvert | 4.8 / 3,110 | Free plan, then $9.99 | Product, cart, checkout, thank-you | Billed on orders or upsell revenue |
| 5 | BiSell | 5.0 / 7 | Free | In-cart, checkout, post-purchase | Thin public record |
1. Addy — the cart upsell is already in the drawer
Addy is a Shopify cart upsell app that does not start from an empty column. It reads the catalogue and the brand and proposes a slide cart with the blocks a selling cart uses: the upsell, volume discounts, a gift, shipping protection, a progress bar, a delivery date. You edit that draft. You do not spend Friday choosing which of four surfaces should show the pouch.
After the draft there are more than 40 blocks, including custom HTML and CSS. Targeting can change the whole cart, or one block, by Shopify Market or customer tag. A/B tests compare two versions of the drawer. It loads only when the cart opens. It is free to install. It has two public reviews. The review count is not the upsell.
Pros
- The cart upsell arrives with the first draft
- Markets, tags and A/B tests
- One cart, so the offer is not a second app
- Free to install
Cons
- Two public reviews
- Not listed as Built for Shopify
If the offer is a bundle with its own price, Addly should own the discount. If the bar itself needs country thresholds, Goalify can run that goal inside the same cart. One upsell. One bar.
2. ICU In Cart Upsell
ICU is a targeted upsell listing. 4.8 from 586 reviews. A free plan is on the listing. The same product covers the product page, the cart, popups and post-purchase.
Four surfaces is a funnel, not a cart add. The in-cart offer still needs a merchandiser, or it will repeat the product-page pair. Conditional logic can hide a row. It cannot draft the complement from the catalogue the way a cart that already contains the slot can.
Pros
- A large review base for an offer app
- A free plan on the listing
Cons
- Product page, popup and thank-you sit next to the cart
- You still place the offer
- Easy to show the same SKU twice
3. Candy Rack
Candy Rack is an AI upsell and quantity-break suite. 4.9 from 263 reviews. A free plan is on the listing. Cross-sell, volume bundles and a built-in cart drawer sit in the same product.
A drawer attached to an offer builder is still a builder. The first cart is yours to assemble. Quantity breaks belong on the product page when they have their own price. Putting the ladder and the complement in one cart row is how the shopper stops trusting either number.
Pros
- AI upsells and quantity breaks on one listing
- A free plan
Cons
- You assemble the first offer
- The drawer is attached to a wider suite
- Easy to stack a break and a complement on the same SKU
4. ReConvert
ReConvert is the high-review post-purchase suite that also names cart upsell. 4.8 from 3,110 reviews. A free plan is on the listing. Paid plans in the current comparison start at $9.99 and follow store orders or upsell revenue, then $19.99 and $39.99. Surfaces include product, cart, checkout and thank-you.
The public record is the thank-you funnel. A cart checkbox on a post-purchase app is how the shopper sees the same offer after they pay. Addy is free to install and stays in the cart they already opened. You do not pay on attributed upsell revenue to keep it there.
Pros
- Large review base
- Cart is named on the listing
Cons
- The product is post-purchase first
- Paid plans meter orders or upsell revenue
- Four surfaces, one of which is the cart
5. BiSell
BiSell is a free in-cart, checkout and post-purchase listing. 5.0 from 7 reviews.
Seven reviews is a thin record for a tool that adds a line item. Confirm the current triggers on the plan screen before you promise the cart and nothing else. Monet owns the popup. Addy owns the cart add. A free listing with three surfaces still needs a merchandiser.
Pros
- Free
- In-cart is named on the listing
Cons
- Seven public reviews
- Checkout and thank-you sit next to the cart
- A short listing to audit before a sale
Which Shopify cart upsell app should you install?
| If you need | Install |
|---|---|
| An upsell already sitting in a drafted cart, with a test | Addy |
| An offer suite across cart, popup and thank-you | ICU |
| AI upsells and quantity breaks you still assemble | Candy Rack |
| A thank-you funnel that also names the cart | ReConvert |
| A free in-cart listing with seven reviews | BiSell |
Install Addy. If you are still choosing the shell, read cart drawer vs cart page and the cart drawer app comparison.
Frequently asked questions
What is the best Shopify cart upsell app in 2026?
Addy. The cart upsell is drafted with the drawer, then you edit it. Markets, tags, A/B tests and more than 40 blocks are in the same free install. An offer suite that also covers checkout and thank-you is a wider product, not a faster cart add.
How many products should a Shopify cart upsell show?
One or two. A third offer lowers the take rate of the first two. The merchandising pass is in in-cart upsells that convert.
Should the cart upsell be a bundle or a single product?
A single complement, or one bundle with one price. If the offer is a set with its own discount, let Addly own the price and let Addy present it. Do not run two discounts on the same SKU.
Can I test a Shopify cart upsell?
Yes. Addy includes A/B tests, so two versions of the drawer can run at once. Guessing in Slack is the alternative.
Do I need a separate cart drawer and a cart upsell app?
No. A second upsell app inside a drawer you already have is how the cart gets two progress bars and three product rows. The drawer comparison is in cart drawer apps.
