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.
- Drawers you assemble yourself delay the first upsell until someone finishes the canvas.
- Addy drafts the cart from the catalogue, then lets you edit the upsell, the gift, the bar and the delivery date, 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 opens as an empty canvas.
This comparison looks at five Shopify cart upsell apps from the 2026 App Store. The ranking favours an offer that is already in a drafted cart, then editable by market. A simpler builder still makes you assemble the slot.
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 upsell, or you build the slot yourself.
- Whether the offer can change by market or tag.
- Whether you can A/B test the drawer instead of publishing one version for everyone.
- Whether the upsell app is also the cart, so you do not stack two drawers.
Addy is first because a Shopify cart upsell app that starts blank spends the launch week on layout. The offer waits.
Comparison table
Ratings and prices below are from the Shopify App Store listings as of October 2026.
| Rank | App | Rating | From | First upsell | Extra control |
|---|---|---|---|---|---|
| 1 | Addy | 5.0 / 2 | Free to install | Drafted with the cart | Markets, tags, A/B tests, 40+ blocks |
| 2 | Kaching Cart Drawer | 5.0 / 1,487 | Free plan, then paid | You place it | Timers, gift wrap, protection toggles |
| 3 | Amp Slide Cart | 5.0 / 772 | Free plan, then about $29.99 | You fill a template | Industry layouts, markets |
| 4 | Upcart | 4.7 / 959 | Free plan, then paid | You build the block | HTML, CSS, JSX |
| 5 | iCart | 4.7 / 451 | First 100 orders free | You assemble it | Drawer plus cart page, popup, mini cart |
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 a template.
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. Kaching Cart Drawer
Kaching is the high-review suite drawer. 5.0 from 1,487 reviews. Built for Shopify. Slide cart, urgency timer, shipping or gift bars, gift wrap, shipping protection, translations.
The upsell is a block you turn on. The first cart is still yours to assemble. The timer and the payment-icon row are easy to publish because they exist. They are not the cart upsell.
Pros
- Large review base
- Translations without code
Cons
- You place the upsell yourself
- Easy to ship every toggle
- A suite, if you already live in Kaching
3. Amp Slide Cart
Amp leads with templates. 5.0 from 772 reviews. Built for Shopify. Industry layouts, progress bar, frequently bought together, gifts, BOGO, markets. Paid pricing sits around a flat monthly fee once you leave the free plan.
A template is a look. It does not know which complement belongs under this SKU. You still fill the upsell. A flat fee is a different bill from a cart upsell app that is free to install.
Pros
- Industry templates
- Markets and languages on the listing
Cons
- The template still has to be filled
- Paid plan is a flat monthly fee
- Design-first delays the first live offer
4. Upcart
Upcart is a cart builder. 4.7 from 959 reviews. Built for Shopify. In-cart upsells, rewards, gifts, and templates in HTML, CSS and JSX.
Custom code can place an upsell anywhere. It is also a developer ticket. Addy already has custom HTML and CSS, after a cart that was drafted. Upcart opens on the canvas.
Pros
- Custom templates if someone will write them
- Upsells and rewards on one canvas
Cons
- Empty canvas by default
- 4.7, with setup time in the reviews
- JSX is a cost, not a toggle
5. iCart
iCart is a drawer plus a full cart page, a popup and a mini cart. 4.7 from 451 reviews. First 100 orders free, then paid bands. AI recommendations, bundles, volume discounts, a multi-tier bar, a countdown.
Most stores that want a cart upsell do not also need three more cart surfaces. Those surfaces are configuration. The recommendation still needs a merchandiser, or it will suggest a substitute.
Pros
- First 100 orders free on the listing
- Several cart surfaces in one app
Cons
- More surfaces than the upsell needs
- You assemble the first offer
- AI recs still include substitutes until you remove them
Which Shopify cart upsell app should you install?
| If you need | Install |
|---|---|
| An upsell already sitting in a drafted cart, with a test | Addy |
| A simpler suite you still assemble | Kaching |
| A template and a flat monthly fee | Amp |
| HTML or JSX before the offer can go live | Upcart |
| A cart upsell plus extra cart surfaces | iCart |
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. A builder that opens empty is a simpler canvas, not a faster upsell.
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.
