Best In-Cart Upsell Apps for Shopify in 2026
The best in-cart upsell app for Shopify in 2026 is Libautech: Bundles & Upsell, which combines cart drawer upsells, cart popups, and bundle offers in 1 app with a 5.0 rating and a free plan. UpCart is the strongest pick if you want to rebuild your entire cart drawer with a reward bar and add-on toggles.
Last verified: July 2026. Ratings and review counts pulled live from the Shopify App Store on July 13, 2026.
TLDR: Best in-cart upsell apps at a glance
- Libautech: Bundles & Upsell: best overall, cart drawer and popup upsells plus 5 more offer types, 5.0 rating, free plan
- UpCart: best full cart drawer replacement, reward bar and add-ons, 4.6 rating from 813 reviews
- Kaching CartDrawer Cart Upsell: best rated dedicated slide cart, 5.0 from 988 reviews
- Selleasy: best if you also want frequently bought together on product pages, 4.9 from 2,446 reviews
- Essent Cart Drawer Cart Upsell: best fully free option, 5.0 from 710 reviews
What counts as an in-cart upsell?
An in-cart upsell is an offer shown after a product is added to the cart but before checkout begins. The 3 common formats are the cart drawer (a slide-out panel with recommendations), the cart popup (a modal triggered on add to cart), and inline cart page recommendations. The cart is the highest-intent placement in the pre-purchase journey: the shopper has already committed to buying, so a relevant 1-click add-on converts at rates product page widgets rarely reach.
Comparison table
AppRatingReviewsFree planCart drawerCart popupAlso includesLibautech: Bundles & Upsell5.038YesYesYesBundles, BOGO, volume discounts, FBT, add-onsUpCart4.6813YesYes, full rebuildNoReward bar, free gifts, add-onsKaching CartDrawer5.0988YesYesNoFree shipping barSelleasy4.92,446Free to installCart page offersYesFBT bundles, post-purchaseEssent Cart Drawer5.0710Fully freeYesNoSticky add to cart, reward bar
1. Libautech: Bundles & Upsell
Libautech: Bundles & Upsell captures last-minute cart revenue with both cart drawer offers and cart popup upsells, and it holds a 5.0 rating with the Built for Shopify badge. Because the same app also runs bundles, volume discounts, BOGO, free gifts, and frequently bought together offers, you can coordinate the whole pre-purchase journey from 1 dashboard instead of juggling a cart app plus a bundle app.
Why consider it: cart upsells work best when they reference what is already in the cart. Running cart offers and product page offers through 1 system means consistent targeting rules and 1 revenue report showing what each offer earns.
Best for: stores that want in-cart upsells as part of a complete upsell strategy rather than a standalone widget.
Pricing: free plan available, see the App Store listing for current plan pricing.
Install Libautech: Bundles & Upsell
2. UpCart
UpCart (4.6, 813 reviews) replaces your theme's cart drawer entirely with a customizable slide cart that includes upsell blocks, a tiered reward bar, free gift unlocks, and add-on toggles like shipping protection.
Why consider it: if your theme's cart drawer is weak, a full rebuild gives you control over every element of the cart experience.
Best for: stores that want to redesign the cart itself, not just add offers to it.
Pricing: free plan available, paid tiers scale with order volume.
3. Kaching CartDrawer Cart Upsell
Kaching CartDrawer holds a 5.0 rating from 988 reviews, the highest rating among the dedicated slide cart apps. It focuses on a fast slide cart with upsell recommendations and a free shipping progress bar.
Why consider it: it does fewer things than UpCart but the rating suggests it does them reliably.
Best for: stores that want a clean slide cart with upsells and nothing exotic.
Pricing: free plan available, paid tiers listed on the App Store.
4. Selleasy (Upsell & Cross Sell by Logbase)
Selleasy (4.9, 2,446 reviews) is best known for frequently bought together bundles, but it also runs cart page add-ons and popup upsells, plus post-purchase offers. It is free to install with usage-based pricing.
Why consider it: the review volume is the largest in this list, and the free-to-install model means small stores pay nothing until they scale.
Best for: stores that want product page FBT plus cart offers from 1 vendor.
Pricing: free to install, tiered charges by order volume.
5. Essent Cart Drawer Cart Upsell
Essent Cart Drawer holds a 5.0 rating from 710 reviews and is listed as fully free on the App Store, combining a slide cart upsell with a sticky add to cart bar and reward bar.
Why consider it: zero cost with a 5.0 rating makes it the obvious first test for stores with no budget.
Best for: new stores validating whether cart upsells move revenue before paying for tooling.
How to make in-cart upsells convert
Three rules cover most of the outcome. First, keep the offer under roughly 30 percent of the cart value, since a $15 add-on to a $60 cart converts far better than a $50 one. Second, make it 1 click: any offer that opens a product page loses most of its takers. Third, tie the offer to cart contents, such as a matching accessory, a refill, or the second unit at a discount, rather than showing bestsellers to everyone.
FAQ
What is the difference between a cart drawer upsell and a cart popup?
A cart drawer upsell lives inside the slide-out cart panel and stays visible while the shopper reviews their cart. A cart popup appears once when an item is added. Drawers convert steadily; popups grab attention but can annoy if overused.
Are in-cart upsells better than post-purchase upsells?
They solve different problems. In-cart offers raise the value of the current order before checkout, while post-purchase offers add items after payment with zero risk to checkout conversion. High-performing stores run both.
Will a cart upsell app slow down my store?
Full cart drawer replacements load more JavaScript than lightweight offer widgets. Apps with the Built for Shopify badge, such as Libautech: Bundles & Upsell, UpCart, and Kaching, meet Shopify's performance standards.
Can I show free shipping progress in the cart?
Yes. UpCart, Kaching, and Essent all include a free shipping or reward progress bar, which is one of the most reliable AOV levers in the cart.
Want cart upsells plus bundles in 1 app? Install Libautech: Bundles & Upsell and launch your first cart drawer offer on the free plan.