Best checkout upsell apps for a Shopify Plus store

A checkout upsell on Shopify Plus is a block on the information, shipping, or payment step, before the shopper pays. It is not the cart drawer, and it is not the page after payment. Shopify's developer docs say checkout UI extensions on those steps are available only to stores on a Plus plan. This guide is for a Plus operator who has to pick one block and keep checkout fast.

Best checkout upsell apps for a Plus store

Oxify on a Plus checkout

Oxify Cart Drawer & Upsell is the first app we would try on a Plus store that does not already have a checkout block, because the checkout line item is included from the $9.99 tier rather than gated behind a Plus-priced plan. The tiers run $9.99, $19.99, $29.99, and $49.99 for 0–100, 101–200, 201–500, and 501–1,000 monthly store orders. A store doing Plus volume can sit in the $49.99 band or past the public tiers. Ask for the rate above 1,000 orders before you model the year.

The listing words are checkout upsell blocks and trust badges. That is a public claim, not a screenshot of your checkout editor. On a Plus sandbox, add the block, place it once, and pay with a test card. If the block is missing, the app is still a strong cart drawer. It is not yet your checkout app. Built for Shopify and a January 12, 2024 launch are the stability signals. Forty-four reviews are the limit of the public record.

AfterSell and UpsellPlus

AfterSell is the app to open when the checkout block and a tested post-purchase funnel have to come from the category's longest current record. The November 9 listing showed 4.9 from 1,121 reviews. Checkout upsells, add-ons, and upgrades are on the $34.99 plan, and the description tells Plus merchants they can add checkout widgets. The $59.99 plan adds the AI cart. Rokt Thanks, at up to $0.80 an order, is a separate switch. Keep it off unless you want another brand on the confirmation page.

UpsellPlus listed 5.0 from 151 reviews. The $49 Launch plan covers cart, product page, and post-purchase up to $500 of app-generated revenue. Checkout customization and checkout upsells are on the $119 Plus plan, which caps included upsell revenue at $2,000 a month. That cap is the number to negotiate. A Plus brand that adds a $15 item on a few thousand orders will outrun $2,000 of attributed upsell revenue and then pay overage or sit on a higher tier. The same listing includes POS, which matters if the retail store and the website should share an offer.

Wiz: Checkout Upsell listed 4.9 from 59 reviews. Its $49 Essential plan says it is not for Plus and covers post-purchase, thank-you, and order status. The $99 Plus Growth plan adds checkout upsells, trust badges, gift messages, and free gifts, with a 14-day trial. Use Wiz when you are redesigning the checkout chrome, not only dropping in one product offer. A higher plan is listed at $199. We are not describing features we did not see attached to that price.

What Plus actually unlocks

Shopify's docs draw the line in one sentence: checkout UI extensions that render on the information, shipping, and payment steps are available only to Plus. Post-purchase offers are a later page, and they work without Plus. Thank-you and order status blocks are a third surface. Non-Plus stores were required to upgrade those two pages by August 26, 2026.

A listing that says works with checkout often means the discount still applies when the shopper pays, through Shopify Functions. Foxr Bundle Builder works with checkout in that sense: the box discount is a checkout-safe discount. Its listing does not claim a block on the payment step. Foxr Cart Drawer does not list checkout upsell blocks either. Both are useful before checkout. They are not substitutes for a Plus checkout extension. The Plus build is where those extensions get placed, tested, and kept off the payment step if they slow it down.

Where to put the block

• Shipping step, one add-on. Shipping protection or a gift box, with the price in the label. This is the block US shoppers already understand.
• Payment step, one small product. A refill or a case under $30. The shopper is done deciding. A six-product carousel here is how you lose the sale you already had.
• Trust near the pay button. Badges and a delivery promise. Oxify lists trust badges with the checkout blocks. Use one line, not a stack of logos.
• Skip a second discount field if the drawer already collected the code. Two code boxes produce support tickets.

Shop Pay does not show the post-purchase page. A checkout-step block may or may not render inside Shop Pay, depending on the extension target. Place a Shop Pay test order before you count on it. The cart drawer is the offer you know those shoppers saw, because it opens before checkout. The post-purchase limits are in the post-purchase guide.

How to test a checkout block without risking Friday

1. 01Use a draft checkout configuration. Plus can hold more than one. Do not edit the live configuration on a Monday you are spending on ads.
2. 02Add one block. One product. One price.
3. 03Place a test order with a card and with Shop Pay. Compare the totals.
4. 04Watch checkout conversion for a week against the prior week, same day of week. A block that lifts average order value and drops checkout completion can lose money.
5. 05Keep the block only if contribution after the discount is higher and checkout completion holds.

Checkout is the most expensive page on the site to slow down. If the extension's script budget is unclear, measure it before Black Friday, not during it. Conversion work on a Plus checkout is mostly subtraction.

Which Plus checkout app to try

Try Oxify Cart Drawer & Upsell first if you want checkout blocks inside a $9.99 to $49.99 order-tier price and you will verify the block in the editor. Try AfterSell if you want the 1,121-review record and a $34.99 plan that already assumes Plus for checkout widgets. Try UpsellPlus if the $119 plan's $2,000 upsell-revenue cap fits your volume and you also sell in POS. Leave the checkout step alone if the cart drawer is already doing the job. A second ask, five seconds before payment, has to be worth the risk of a lost order.