What is Upcart—Cart Drawer Cart Upsell?
Upcart is a slide-cart app built around full design control, letting merchants build in-cart upsells, cross-sells, rewards and add-ons that match their storefront exactly, down to custom HTML, CSS and JSX. It carries the Built for Shopify badge and shows a 4.7/5 rating on 816 reviews, the lowest average rating among the cart-upsell apps in this batch. It's developed by Rokt (the same company behind Aftersell), based in Vancouver, and launched in July 2021.
How does the app work on a Shopify store?
Merchants build a fully custom cart drawer with AI-powered in-cart upsells, a rewards progress bar toward free shipping, and add-ons like gift wrap, all editable through code-level HTML and CSS control rather than fixed templates. The cart stays visible via a sticky trigger across the store, aiming to reduce friction before checkout. It's currently English-only, and priced by monthly order volume tiers rather than by revenue share.
Why choose Upcart over another cart upsell app?
Full HTML, CSS and JSX customization goes further than most competing cart-drawer apps in this list, which tend to offer a fixed set of style options rather than genuine code-level control, useful for a store with a very specific brand identity. Being part of the same company as Aftersell means a merchant could pair the two for a fuller upsell stack from one vendor across cart and post-purchase stages. The comparatively higher rate of 1-star reviews (5%) compared to Kaching CartDrawer or Kaching Bundles is worth digging into in hands-on testing, since a handful of reviews specifically mention frustration with AI-only support before reaching a human agent.
What are the 3 main features of the app?
- Full code-level customization of the cart drawer via HTML, CSS and JSX.
- AI-powered in-cart upsells and cross-sells.
- Rewards progress bar toward free shipping or gift thresholds.
