What is the best free Shopify upsell app?

Selleasy, Bold Upsell, and Bundler all have usable free tiers, and the cart-drawer apps (Amote, Kaching, XB Sticky Add-to-Cart) are free outright since they're funded by their developers' other paid apps. Free tiers cap out on order volume or feature count, so check the limit against your store size before committing to one.

What's the difference between an upsell app and a cross-sell app?

An upsell offers a better version of what's already in the cart (a bigger size, a bundle). A cross-sell offers something different but related (a case for the phone someone just bought). Most apps on this list, and Klaviyo's own flow template, lump both into one feature because the mechanics (trigger, timing, filter) are identical.

Do post-purchase upsell apps slow down checkout?

The thank-you-page apps (ReConvert, AfterSell, Honeycomb) show the offer after payment is captured, so they don't add friction to checkout itself. Cart-drawer apps load inside the cart, which can add a small amount of weight; check your theme's page-speed score after installing one.

Can I combine an upsell app with Klaviyo?

Yes, and most stores should. The apps on this list handle the on-site offer while the customer is still in session. A separate Klaviyo flow, triggered off Fulfilled Order with about a 14-day delay, handles the email upsell after they've left. The two don't compete for the same moment.

The Best Shopify Upsell Apps (and the Upsell Email None of Them Send)

For most Shopify stores, the right upsell app depends on where you want the offer to happen, not which app has the most features. Cart-drawer apps catch impulse buys before checkout and are usually free. Thank-you-page apps sell a single add-on right after payment for about $5 to $35 a month. Full-funnel AI apps run personalized offers everywhere, start around $12 a month, and climb past $95 for bigger catalogs. Every roundup of these apps, including this one's competitors, stops at the thank-you page. None of them mention the second upsell window: the email you send after the customer has already left the site.

Which Shopify upsell app should you use?

Match the app to the stage, not the marketing page:

Just want more per cart, for free: a cart-drawer app.
Want a clean one-click offer after checkout: a thank-you-page app.
Already running a decent-sized store and want AI picking the offer everywhere: a full-funnel app.
Already have one of the above: add the email layer underneath it, which is the part this guide covers that the others skip.

Cart-drawer upsells: free, simple, easy to outgrow

These sit inside the cart drawer itself, before checkout, and nudge the customer to add one more thing while they're still deciding.

Amote: Cart Upsell Cart Drawer, Kaching Cart Drawer AI Upsell, and XB Sticky Add-to-Cart Upsell are the three worth trying first. All three are free, and all three use the same playbook: a progress bar toward free shipping, a sticky cart icon, and product recommendations inside the drawer. Kaching and XB add AI-driven recommendations on top of the basics; Amote leans on FOMO messaging like low-stock counters instead.

The ceiling here is real. Cart-drawer upsells only reach someone who already opened the cart, and they stop mattering the moment checkout starts. They're a reasonable first install because there's no cost to try, but don't expect them to move the needle the way a thank-you-page or email upsell can.

Thank-you-page upsells: one offer, right after payment

These apps show a one-click add-on after the card is already charged, so there's zero checkout friction, just an extra "add this for $X" button before the order confirmation.

ReConvert. Post-purchase thank-you-page offers plus customer data collection. Free plan, then $4.99–$14.99/mo plus 0.75% of the extra revenue it generates.
AfterSell. Thank-you-page customization with Shopify Plus checkout-extension support and AI-assisted offer selection. Free plan, then $34.99–$99.99/mo.
Zipify OneClickUpsell (OCU). Pre- and post-purchase upsells across product, cart, and thank-you pages. Free trial, then $35–$195/mo plus 1% of upsell revenue.
Selleasy. Pre- and post-purchase upsells at the product page, cart, and thank-you page. Free plan, then $8.99–$16.99/mo.
Honeycomb Upsell & Cross Sell. Pre- and post-purchase with AI-picked suggestions. Free plan, then $49.99–$149.99/mo.

If you're choosing one, Selleasy and ReConvert are the cheapest entry points; AfterSell and Zipify charge more but add Shopify Plus checkout-extension support, which matters if you're already on Plus.

Full-funnel and AI upsell apps: for stores that have outgrown the basics

These cover product page, cart, and thank-you page from one app, usually with AI choosing the offer per customer instead of a fixed rule.

Rep AI. Conversational AI shopping assistant across the whole funnel, plus support and analytics. $12–$95/mo, with custom enterprise pricing above that.
LimeSpot. AI personalization and recommendations across web, email, and SMS. $6.99–$50+/mo.
Candy Rack. Multi-placement pop-up upsells at product, cart, checkout, and post-purchase. $39.99–$399.99/mo.
Bold Upsell. Full-funnel offers from product page to post-purchase, including BOGO and bundle logic. Free up to $50/mo.
Frequently Bought Together. AI-bundled product-page suggestions. $9.99–$19.99/mo.
Bundler. Mix-and-match bundles and volume discounts. Free up to $19.99/mo.
Upsell.com. Post-purchase thank-you-page funnels. $4.99–$149.99/mo.

LimeSpot and Rep AI are the two names here that claim an email or SMS connection, but it's a merchandising feed, the same product recommendations synced into an email template, not a written, sequenced upsell flow. Neither one builds or sends the actual email.

What none of these apps do: the upsell email

Across all three roundups that rank for "best shopify upsell app," fifteen different apps, not one is marketed as writing or sending a post-purchase upsell email. That's a real gap, because the email window outlasts the on-site window. A cart-drawer or thank-you-page offer only works while the customer is still on your site. An email reaches them again days later, after they've had the product in hand.

Omnisend's 2026 benchmark, drawn from more than 470 million automated sends across 27,000+ brands, puts cross-sell emails at a 42.09% open rate, 3.02% click rate, 0.87% conversion rate, and $0.95 in revenue per email sent. The order-confirmation email that typically precedes it converts at 1.61%, generating $2.88 per email, almost three times the cross-sell number, because the customer is still in a "just bought something" mindset. Neither number replaces an on-site upsell app. They're evidence that the email channel keeps converting well after the apps above have done their job and moved on.

How do you actually send the upsell email?

The flow itself is simple once you know the mechanics, and it runs in parallel with whatever on-site app you're using, not against it. Trigger it off Placed Order or Fulfilled Order (Klaviyo's own default cross-sell/upsell flow uses Fulfilled Order, since it's closer to when the customer has the product in hand). Set roughly a 14-day delay so the offer lands after delivery, not before. Add a profile filter for "Fulfilled Order zero times since starting this flow" so a repeat purchase doesn't trigger a duplicate email.

What most stores get stuck on isn't the flow setup, it's the copy: pulling the right complementary product, writing a subject line that doesn't read like spam, and matching the store's actual branding instead of a generic template. That's the production step JetFlow is built for: it reads the store's catalog and brand, writes the email, and pushes it into Klaviyo as a flow you can turn on. For the Klaviyo add-ons that fill other gaps next to it, like reviews and loyalty data that make the targeting sharper, see the best Klaviyo add-ons for Shopify stores.