There are 3 best options of Shopify cart upsell apps on the market: OneClickUpsell (OCU), AfterSell and Rebuy Smart Cart. They’re the only apps in this comparison that run cart offers and post-purchase offers in the same app. The other four (Kaching Cart Drawer, iCart, Monster Cart and Essent Cart Drawer) focus on the cart.
AfterSell’s and Rebuy’s Shopify App Store listings aren’t available for new installs, so new stores can’t add either app right now.
Of the three, I recommend OCU, our app, for most stores. It’s the only one billed on upsell revenue rather than store orders, so the bill rises only when upsells earn more. In a Black Friday/Cyber Monday (BFCM) month with 2,800 orders and $700 in upsell revenue, OCU costs $49 and AfterSell’s Pre-Purchase plan costs $137.99. OCU’s Slide Cart Drawer is in every plan from $9.95 a month, along with product page, pre-purchase, in-checkout (Shopify Plus) and post-purchase offers.
Below, you’ll find a side-by-side table of all 7 apps (billing, entry price, free option, placements and A/B testing) and a review of each app. You’ll also see what OCU, Kaching and AfterSell cost at three store sizes, including a BFCM month, and which app fits which need. The article ends with how to set up a cart upsell in OCU in 5 steps.
Key Takeaways
- Cart upsell apps bill on store orders or upsell revenue. Price any app at your BFCM order count.
- At 150 orders a month, most cart apps cost $9–$14. Prices split as orders grow.
- Check which placements share the plan. Some cover only the cart; others add product page and post-purchase offers.
- Judge cart offers by revenue per visit, not conversion rate. In one store’s test, conversion fell from 14.48% to 10.19%, while revenue per visit rose from $2.52 to $4.56.
What Is a Shopify Cart Upsell App?
A Shopify cart upsell app adds offers to the cart, usually in a slide-out cart drawer, so shoppers can add a related product before checkout. Most also add a progress bar toward free shipping or a free gift. The cart works for upsells because shoppers who open it have already decided to buy.
Why Is the Cart the Right Place for an Upsell?
By the time shoppers open the cart, they’ve decided to buy. A cart upsell app uses that moment to show a relevant add-on before checkout. Our guide to in-cart upsells on Shopify covers the tactics in depth.
Extra Costs Drive Cart Abandonment
The Baymard Institute puts the average cart abandonment rate at 70.22%, and 40% of shoppers who abandon blame extra costs, such as shipping. A free-shipping bar shows each shopper how far they are from the threshold, which gives them a reason to add one more item.
Pre-Purchase Offers Convert Best
Offers shown before payment convert better than offers shown after it. Focus Digital’s 2026 report found order bumps convert at 37.8%, against 14.6% for post-purchase upsells. Zipify’s audit of $143M in upsell revenue found that pre-purchase placements convert 57% better than post-purchase ones.
Stores That Upsell in More Places Earn More
In the same audit, stores with two or more placements earned 2.5x the upsell revenue of post-purchase-only stores, and stores with three or more earned 3.6x. Placements other than post-purchase brought in 45.3% of the $143M.
When you choose an in-cart upsell Shopify app, check that it also runs offers on the product page and after purchase.
How Do the Best Shopify Cart Upsell Apps Compare?
The 7 apps differ most on three things: what the bill is based on, which placements share the plan, and whether you can A/B test the cart offer.
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| App | Billed on | Lowest paid plan with a cart | Free option | Placements in the same plan | A/B testing | New installs |
|---|---|---|---|---|---|---|
| One Click UpsellOur app | Upsell revenue | $9.95/mo | Free on development stores; 30-day trial | Product page, pop-up, cart, in-checkout (Plus), post-purchase, thank-you page | Unlimited, every placement, every plan | Yes |
| AfterSell | Store orders | $59.99/moPre-Purchase | 30-day trial | Cart and product page | Carts and offers | Unavailable |
| Kaching | Store orders | $9.99/mo | Free plan | Cart | Listed in analytics | Yes |
| iCart | Store orders | $9/mo | First 100 orders | Cart drawer, popup or cart page | Not listed | Yes |
| Monster Cart | Store orders | $9.99/mo | Up to 50 orders (launch offer) | Cart, product page volume discounts | Not listed | Yes |
| Essent | Store orders | $8.99/mo | Up to 30 orders/mo | Cart, sticky add-to-cart | Not listed | Yes |
| Rebuy | Store orders | $25/moCart & Merchandising | 14-day trial | Cart | Separate package | Unavailable |
Sources: each app’s own pricing page or Shopify App Store listing, checked October 2026. Disclosure: Zipify makes OCU.
How Did I Choose These Apps?
I started with the Shopify App Store’s cart customization category and kept apps with a cart drawer that shows in-cart offers. Then I compared each app’s billing model and its coverage before the cart, and checked whether it supports split testing. AfterSell, Rokt’s post-purchase app, added a cart drawer feature in October 2026. It replaces Upcart, Rokt’s earlier cart app, which is no longer available on the Shopify App Store.
Every competitor detail comes from the app’s own listing, pricing page, or help docs, checked in October 2026. For upsell apps beyond the cart, see our guide to the best Shopify upsell apps.
What Are the Best Shopify Cart Upsell Apps?
Here are the seven apps, starting with our top pick.
1. Zipify One Click Upsell
A Slide Cart Drawer on every plan
One Click Upsell’s Slide Cart Drawer is included on every plan, with no add-on fee. It holds up to eight AI-powered offers that personalize to each shopper, plus a reward bar you can set as a free-shipping bar. Shoppers can review and edit their cart from any page.
Offers before the cart, in the same app
OCU covers your whole funnel in one install: the product page widget, pre-purchase pop-ups, in-checkout upsells on Shopify Plus, one-click post-purchase upsells, and thank-you page offers. One plan includes all of it, from $9.95 a month. See how the placements fit together in our complete Shopify upsell app guide.
Unlimited A/B testing, with AI tests in the cart
Every OCU store can run unlimited A/B split tests at every placement, on every plan. In the cart, you can also test an AI Offer variant that picks products from smart recommendations. Zipify Plus, our managed service for Shopify Plus brands, also get multivariate A/B/C/D tests.
An AI assistant that tells you what to fix in your cart
OCU’s AI Assistant reads your product catalog and order history, then points to what to improve first, such as an underperforming cart offer. It recommends changes, and nothing goes live without your approval, so it’s zero risk to try. OCU is also the first upsell app to integrate with Shopify Sidekick.
Billed only on upsell revenue
Plans start at $9.95 a month and follow what your upsells earn, with a cap of $999 a month. Only revenue from OCU offers counts toward your tier. When store orders spike, the bill changes only if upsell revenue does.
Shopify Plus certified
One Click Upsell is Shopify Plus Certified. On Shopify Plus, in-checkout upsells are included on every plan at no extra cost. When Shopify needed help building upsells for its own checkout, it partnered with Zipify.
Proven in the cart
In its first 30 days with the Slide Cart Drawer, Gussy’s Gut lifted AOV by 16.47%. Savvy Touch added $38,134 in revenue from cart drawer upsells, 76% of its total upsell revenue. Read the Slide Cart Drawer case study. Across all placements, OCU merchants generated $254M in upsell revenue in 2025, up 25% year over year.
Who it’s for: any Shopify store that wants a cart drawer and every other upsell placement on one plan, with a bill tied to upsell revenue.
See One Click Upsell running on a live demo store
2. AfterSell (Rokt)
AfterSell, from Rokt, sells its cart as Aftersell Cart.
18+ widgets in the cart
The cart includes subscription upsells, shipping protection, express payment buttons, free gifts and tiered progress bars for gifts, discounts or free shipping.
Post-purchase offers on a separate plan
The cart and product page upsells are on the Pre-Purchase plan. Post-purchase and checkout (Plus) offers need the Post-Purchase plan, or Complete for both.
Rule-based targeting and multivariate tests
Offers come from machine-learning recommendations or hand-picked products, targeted by cart contents, customer tags, subtotal and shipping country. You can A/B or multivariate test whole carts.
Built from a prompt, copied between stores
You can build a cart from a text prompt without theme code, then export it as a JSON file to reuse in another store.
Who it’s for: stores already running AfterSell for post-purchase that want the cart from the same vendor.
Further reading
One Click Upsell vs. AfterSell
How the two compare on billing, funnel coverage, cart drawer and pricing.
3. Kaching Cart Drawer
Kaching Cart Drawer, from Kaching Bundles & Upsells, launched in December 2024.
Sliders and one-tap toggles in the cart
Upsells show as product sliders or one-tap toggles for add-ons like gift wrap and shipping protection, alongside free-shipping and free-gift bars and a countdown timer.
Bundles and post-purchase in separate Kaching apps
The cart app covers the cart. Kaching Bundles, Kaching Subscriptions and post-purchase offers are separate apps, each with its own plan.
Recommendations, rules and A/B tests
Offers come from frequently-bought-together sliders, product recommendations and custom rules, though the listing doesn’t explain the logic. A/B testing is listed under analytics.
Free to build on development stores
It’s free on development stores, so you can build the cart before launch. Setup needs no code, and the cart is translated into 7 listed languages.
Who it’s for: stores already using Kaching Bundles that want a cart from the same team.
4. iCart
iCart, by Identixweb, has been on the Shopify App Store since June 2020.
Four cart formats
You can run a slide cart, mini cart, cart popup or full cart page, and switch between them without changing apps.
Discounts built into the cart
BOGO, volume, free-gift and buy-more-save-more discounts all run inside the cart. Product page and post-purchase offers aren’t listed.
AI recommendations, no listed A/B tests
Offers come from AI-powered recommendations, frequently-bought-together items and custom rules, with an optional countdown timer on each offer. A/B testing isn’t listed.
Review-app integrations
iCart works with review apps such as Judge.me, Yotpo, Loox and Stamped.io, plus PageFly and Simply Shipping Protection. It has a drag-and-drop editor, custom CSS and multi-language support.
Who it’s for: stores that run BOGO, volume or free-gift deals in the cart.
5. Monster Cart
Monster Cart Upsell+, from Monster Apps, launched in July 2020 and released version 2.0 in September 2026.
Reward bars that unlock store credit
Progress bars unlock store credit as well as free gifts, free shipping and discounts. One-tick add-ons include warranties and priority processing.
Volume discounts on the product page
Buy More Save More tiers and frequently-bought-together bundles run on the product page. Pop-ups and post-purchase offers aren’t listed.
Shopify-powered recommendations
Offers come from Shopify’s product recommendations, or frequently-bought-together items chosen by Shopify’s machine learning or by hand. A/B testing isn’t listed.
Design help on paid plans
On paid plans, the Monster team customizes the cart design on request at no charge. The listing is English-only, with Weglot and Transcy integrations for translation.
Who it’s for: stores where free gifts and reward bars are the main cart offer.
6. Essent Cart Drawer
Essent Cart Drawer, from Essential Apps, launched in March 2025.
A sticky add-to-cart bar next to the drawer
A sticky add-to-cart bar shows the product image, variant picker and quantity. The drawer adds a spend-tier reward bar, a countdown timer and an announcement bar.
Other placements in a separate app
Upsells outside the cart, such as on the product page, need Essential’s separate upsell app.
Shopify AI or hand-picked offers
Offers come from Shopify AI recommendations or products you pick by hand. Analytics cover click-through and conversion rates, and A/B testing isn’t listed.
Same features on every plan, with 24/7 support
There’s no feature gating or overage fee, it supports Shopify Markets for multi-currency stores, and support is listed as 24/7 with human agents.
Who it’s for: stores that want the lowest paid entry price for a cart drawer.
7. Rebuy Smart Cart
Rebuy Smart Cart is the cart in Rebuy’s personalization platform.
Subscription switching in the cart
Besides AI recommendations, in-cart rewards and free-shipping bars, Switch to Subscription turns a one-time item into a subscription in the cart, with an option to block downgrades.
Other placements as separate packages
Checkout and post-purchase offers, search and collections, and A/B testing are separate packages. Platform One bundles them all with a dedicated success manager.
Rules on top of AI
AI recommendations combine with rules you build in Rebuy’s personalization engine. Subscription switching needs Recharge or Shopify selling plans synced to Rebuy.
An integrations directory
Rebuy connects tools like Recharge, Skio, Klaviyo and Route, and includes Rebuy Monetize, which shows partner ads after purchase, at no charge.
Who it’s for: large Shopify Plus brands that want AI personalization across search, cart and checkout.
Further reading
One Click Upsell vs. Rebuy
How the two compare on billing, packages, cart drawer and split testing.
How Much Do Cart Upsell Apps Cost When BFCM Orders Spike?
Six of the seven apps charge for store orders. One Click Upsell charges on the upsell revenue. The difference shows most in November, when Black Friday and Cyber Monday (BFCM) traffic lifts order counts faster than upsell revenue.
One Click Upsell pricing, priced on monthly upsell revenue
Every tier includes every placement and feature, with no add-ons.
| Tier | Monthly upsell revenue | Price |
|---|---|---|
| 01 | Up to $200 | $9.95 |
| 02 | $200–$500 | $25 |
| 03 | $500–$1,000 | $49 |
| 04 | $1,000–$2,500 | $99 |
Tiers continue up to $999 a month for stores earning over $40,000 in monthly upsell revenue.
Tiers continue up to $999 a month for stores earning over $40,000 in monthly upsell revenue.
How One Click Upsell billing works:
- OCU checks upsell revenue every 6 hours and never charges more than the tier price for the month.
- Charges appear on your regular Shopify invoice, with no separate card or contract.
Worked scenario (monthly, illustrative)
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| Store (monthly) | One Click Upsell | Kaching Cart | AfterSell (Pre-Purchase plan) |
|---|---|---|---|
| 150 orders, $180 upsell revenue | $9.95 | $14.99 | $59.99 |
| October: 1,000 orders, $600 upsell revenue | $49 | $59.99 | $83.99 |
| November: 2,800 orders, $700 upsell revenue | $49 | $89.99 | $137.99 |
AfterSell figures: $59.99 base fee plus $0.03 per store order above 200, per AfterSell’s billing help article, October 2026.
AfterSell figures: $59.99 base fee plus $0.03 per store order above 200, per AfterSell’s billing help article, October 2026.
Between October and November, orders nearly triple and upsell revenue rises by $100. One Click Upsell’s bill stays at $49, and each order-billed app costs more.
Which Shopify Cart Upsell App Is Right for Your Store?
OCU is the stronger choice when these matter most:
- Billing on upsell revenue. OCU’s bill follows what upsells earn, while the other six apps bill on store orders.
- Every placement on one plan. Product page, pre-purchase, cart, in-checkout on Shopify Plus, and post-purchase offers all start at $9.95 a month.
- BFCM cost. In the November example above, OCU costs $49, while Kaching and AfterSell cost $89.99 and $137.99, respectively.
- Shopify Plus support. OCU is Shopify Plus Certified, and Zipify Plus adds A/B/C/D tests and AfterSell funnel rebuilds.
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| Platform | When to choose |
|---|---|
| AfterSell | Stores that already run AfterSell for post-purchase offers, since its cart is a separate Pre-Purchase plan in the same app. New stores can’t install it while its App Store listing is unavailable. |
| Kaching Cart Drawer | Stores already using Kaching Bundles or Kaching Subscriptions. The cart connects to both, and each stays a separate app with its own plan. |
| iCart | Stores that run BOGO, volume or free-gift discounts in the cart and want a choice of cart formats. A/B testing isn’t listed. |
| Monster Cart | Stores whose main cart offer is a free gift, free shipping or store credit unlocked by spend. Paid plans include design customization by the Monster team. |
| Essent Cart Drawer | Stores that want only a cart drawer, from $8.99 a month for up to 99 orders, with every feature on every plan. |
| Rebuy Smart Cart | Brands that want personalization across search, cart and checkout, bought as separate packages. New stores can’t install it while its App Store listing is unavailable. |
How Do I Set Up a Cart Upsell with One Click Upsell?
You don’t need a developer for any of this. Most stores go live in five steps and about 10 minutes:
- Install One Click Upsell and start your 30-day free trial of the full plan.
- Turn on the Slide Cart Drawer app embed in your theme editor, with no code changes.
- Pick your in-cart products, or let AI choose up to eight offers for each shopper.
- Set the reward bar to your free-shipping threshold, so shoppers see how close they are.
- Run a test checkout to see the drawer live, then start an A/B test on your top offer.
The Slide Cart Drawer help article walks through each setting, and our in-cart upsells guide covers which offers to show.
OCU is month-to-month, with no cancellation fees and a 100% money-back guarantee.
Frequently Asked Questions
Is there a free Shopify cart upsell app?
Several cart apps have free tiers for small stores: iCart for the first 100 orders, Monster Cart up to 50 orders, and Essent up to 30 orders a month. Past those limits, the price depends on order volume. OCU is free on development stores, has a 30-day free trial, then starts at $9.95 a month, priced on upsell revenue.
Does a cart drawer slow down a Shopify store?
Any cart drawer adds a script to your storefront, so measure it on your own theme. Note your Shopify web performance scores, install the app, and compare after a few days of traffic. OCU’s Slide Cart Drawer is a theme app embed you can switch off in one click, and the 30-day trial gives you time to measure.
What’s the difference between a cart upsell and an order bump?
A cart upsell is an offer in the cart or cart drawer before checkout, usually a related add-on. An order bump is a one-click add-on shown in checkout, such as a small accessory or protection plan. On Shopify, in-checkout offers need Shopify Plus. OCU runs cart upsells on every plan and in-checkout offers on Plus, from the same app.
What Is the Best Shopify App for In-Cart Upsells?
OneClickUpsell (OCU), AfterSell and Rebuy Smart Cart are the 3 best options, because each runs cart and post-purchase offers in one app. Of the three, I recommend OCU for most stores. It’s billed on upsell revenue, includes a Slide Cart Drawer on every plan from $9.95 a month, and is the only one of the three available for new installs on the Shopify App Store.
The Verdict: One Click Upsell Is the Best Shopify Cart Upsell App
One Click Upsell is the best Shopify cart upsell app for most stores. Its Slide Cart Drawer comes with every plan and has helped merchants grow AOV by 20% on average.
Product page and cart offers run from the same app, and pre-purchase placements convert 57% higher than post-purchase ones. Pricing is based on upsell revenue, so BFCM order spikes alone don’t raise your bill.
Any live Shopify store can use OCU, including new launches and 8-figure Plus brands. It’s Shopify Plus Certified, and Plus stores can hand their funnels to the Zipify Plus team.
